* [PATCH 00/24] Clean up locking with guard() in ALSA core
@ 2024-02-23 16:27 Takashi Iwai
2024-02-23 16:27 ` [PATCH 01/24] ALSA: ump: Use guard() for locking Takashi Iwai
` (23 more replies)
0 siblings, 24 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
Hi,
this is a patch set for cleaning up the locking code in ALSA core with
the recently introduced guard() macros, i.e. the automatic cleanup
mechanism.
I started poking it in a few days ago, and since then I was very
impressed by how easily and well it simplifies the code. It'd help
for avoiding leaking unbalanced locks, and reduce the LOC.
Most of changes are pretty systematic, just replacing the lock/unlock
with guard() or scoped_guard(). Some unnecessary variable
substitutions could be reduced by the reduction of unlock.
Also, some got slight code refactoring so that guard() macro can be
applied more cleanly, too.
The remaining lock/unlock are mostly for the cases where temporary
re-locking happens, for example in read/write or open loops.
Those could be improved in future. Let's see.
The patches cover only the ALSA core area. The other drivers can
receive benefits in a similar way, I suppose.
Takashi
===
Takashi Iwai (24):
ALSA: ump: Use guard() for locking
ALSA: compress_offload: Use guard() for locking
ALSA: timer: Use guard() for locking
ALSA: hrtimer: Use guard() for locking
ALSA: hwdep: Use guard() for locking
ALSA: info: Use guard() for locking
ALSA: mixer_oss: Use guard() for locking
ALSA: control: Use guard() for locking
ALSA: rawmidi: Use guard() for locking
ALSA: jack: Use guard() for locking
ALSA: core: Use guard() for locking
ALSA: seq: fifo: Use guard() for locking
ALSA: seq: memory: Use guard() for locking
ALSA: seq: ports: Use guard() for locking
ALSA: seq: queue: Use guard() for locking
ALSA: seq: timer: Use guard() for locking
ALSA: seq: midi: Use guard() for locking
ALSA: seq: ump: Use guard() for locking
ALSA: seq: virmidi: Use guard() for locking
ALSA: seq: prioq: Use guard() for locking
ALSA: pcm: Use guard() for locking
ALSA: pcm: Use guard() for PCM stream locks
ALSA: pcm: oss: Use guard() for setup
ALSA: control_led: Use guard() for locking
include/sound/pcm.h | 12 +
sound/core/compress_offload.c | 98 +++-----
sound/core/control.c | 429 +++++++++++++-------------------
sound/core/control_led.c | 150 +++++------
sound/core/hrtimer.c | 24 +-
sound/core/hwdep.c | 49 ++--
sound/core/info.c | 93 +++----
sound/core/info_oss.c | 10 +-
sound/core/init.c | 199 +++++++--------
sound/core/jack.c | 25 +-
sound/core/oss/mixer_oss.c | 153 +++++-------
sound/core/oss/pcm_oss.c | 41 ++-
sound/core/pcm.c | 90 +++----
sound/core/pcm_compat.c | 66 +++--
sound/core/pcm_lib.c | 10 +-
sound/core/pcm_memory.c | 30 +--
sound/core/pcm_native.c | 340 +++++++++++--------------
sound/core/rawmidi.c | 232 ++++++-----------
sound/core/seq/seq_fifo.c | 55 ++--
sound/core/seq/seq_memory.c | 28 +--
sound/core/seq/seq_midi.c | 16 +-
sound/core/seq/seq_midi_event.c | 14 +-
sound/core/seq/seq_ports.c | 114 ++++-----
sound/core/seq/seq_prioq.c | 59 ++---
sound/core/seq/seq_queue.c | 78 +++---
sound/core/seq/seq_timer.c | 163 +++++-------
sound/core/seq/seq_ump_client.c | 13 +-
sound/core/seq/seq_virmidi.c | 18 +-
sound/core/sound.c | 28 +--
sound/core/sound_oss.c | 17 +-
sound/core/timer.c | 429 +++++++++++++-------------------
sound/core/timer_compat.c | 7 +-
sound/core/ump.c | 35 +--
33 files changed, 1244 insertions(+), 1881 deletions(-)
--
2.35.3
^ permalink raw reply [flat|nested] 25+ messages in thread
* [PATCH 01/24] ALSA: ump: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 02/24] ALSA: compress_offload: " Takashi Iwai
` (22 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/ump.c | 35 ++++++++++++-----------------------
1 file changed, 12 insertions(+), 23 deletions(-)
diff --git a/sound/core/ump.c b/sound/core/ump.c
index fe7911498cc4..fd6a68a54278 100644
--- a/sound/core/ump.c
+++ b/sound/core/ump.c
@@ -985,13 +985,11 @@ static int snd_ump_legacy_open(struct snd_rawmidi_substream *substream)
struct snd_ump_endpoint *ump = substream->rmidi->private_data;
int dir = substream->stream;
int group = ump->legacy_mapping[substream->number];
- int err = 0;
+ int err;
- mutex_lock(&ump->open_mutex);
- if (ump->legacy_substreams[dir][group]) {
- err = -EBUSY;
- goto unlock;
- }
+ guard(mutex)(&ump->open_mutex);
+ if (ump->legacy_substreams[dir][group])
+ return -EBUSY;
if (dir == SNDRV_RAWMIDI_STREAM_OUTPUT) {
if (!ump->legacy_out_opens) {
err = snd_rawmidi_kernel_open(&ump->core, 0,
@@ -999,17 +997,14 @@ static int snd_ump_legacy_open(struct snd_rawmidi_substream *substream)
SNDRV_RAWMIDI_LFLG_APPEND,
&ump->legacy_out_rfile);
if (err < 0)
- goto unlock;
+ return err;
}
ump->legacy_out_opens++;
snd_ump_convert_reset(&ump->out_cvts[group]);
}
- spin_lock_irq(&ump->legacy_locks[dir]);
+ guard(spinlock_irq)(&ump->legacy_locks[dir]);
ump->legacy_substreams[dir][group] = substream;
- spin_unlock_irq(&ump->legacy_locks[dir]);
- unlock:
- mutex_unlock(&ump->open_mutex);
- return err;
+ return 0;
}
static int snd_ump_legacy_close(struct snd_rawmidi_substream *substream)
@@ -1018,15 +1013,13 @@ static int snd_ump_legacy_close(struct snd_rawmidi_substream *substream)
int dir = substream->stream;
int group = ump->legacy_mapping[substream->number];
- mutex_lock(&ump->open_mutex);
- spin_lock_irq(&ump->legacy_locks[dir]);
- ump->legacy_substreams[dir][group] = NULL;
- spin_unlock_irq(&ump->legacy_locks[dir]);
+ guard(mutex)(&ump->open_mutex);
+ scoped_guard(spinlock_irq, &ump->legacy_locks[dir])
+ ump->legacy_substreams[dir][group] = NULL;
if (dir == SNDRV_RAWMIDI_STREAM_OUTPUT) {
if (!--ump->legacy_out_opens)
snd_rawmidi_kernel_release(&ump->legacy_out_rfile);
}
- mutex_unlock(&ump->open_mutex);
return 0;
}
@@ -1078,12 +1071,11 @@ static int process_legacy_output(struct snd_ump_endpoint *ump,
const int dir = SNDRV_RAWMIDI_STREAM_OUTPUT;
unsigned char c;
int group, size = 0;
- unsigned long flags;
if (!ump->out_cvts || !ump->legacy_out_opens)
return 0;
- spin_lock_irqsave(&ump->legacy_locks[dir], flags);
+ guard(spinlock_irqsave)(&ump->legacy_locks[dir]);
for (group = 0; group < SNDRV_UMP_MAX_GROUPS; group++) {
substream = ump->legacy_substreams[dir][group];
if (!substream)
@@ -1099,7 +1091,6 @@ static int process_legacy_output(struct snd_ump_endpoint *ump,
break;
}
}
- spin_unlock_irqrestore(&ump->legacy_locks[dir], flags);
return size;
}
@@ -1109,18 +1100,16 @@ static void process_legacy_input(struct snd_ump_endpoint *ump, const u32 *src,
struct snd_rawmidi_substream *substream;
unsigned char buf[16];
unsigned char group;
- unsigned long flags;
const int dir = SNDRV_RAWMIDI_STREAM_INPUT;
int size;
size = snd_ump_convert_from_ump(src, buf, &group);
if (size <= 0)
return;
- spin_lock_irqsave(&ump->legacy_locks[dir], flags);
+ guard(spinlock_irqsave)(&ump->legacy_locks[dir]);
substream = ump->legacy_substreams[dir][group];
if (substream)
snd_rawmidi_receive(substream, buf, size);
- spin_unlock_irqrestore(&ump->legacy_locks[dir], flags);
}
/* Fill ump->legacy_mapping[] for groups to be used for legacy rawmidi */
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 02/24] ALSA: compress_offload: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
2024-02-23 16:27 ` [PATCH 01/24] ALSA: ump: Use guard() for locking Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 03/24] ALSA: timer: " Takashi Iwai
` (21 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
The explicit mutex_lock/unlock are still seen only in
snd_compress_wait_for_drain() which does temporary unlock/relocking.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/compress_offload.c | 98 ++++++++++++-----------------------
1 file changed, 33 insertions(+), 65 deletions(-)
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 5d926c5b737d..f0008fa2d839 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -127,9 +127,8 @@ static int snd_compr_open(struct inode *inode, struct file *f)
init_waitqueue_head(&runtime->sleep);
data->stream.runtime = runtime;
f->private_data = (void *)data;
- mutex_lock(&compr->lock);
- ret = compr->ops->open(&data->stream);
- mutex_unlock(&compr->lock);
+ scoped_guard(mutex, &compr->lock)
+ ret = compr->ops->open(&data->stream);
if (ret) {
kfree(runtime);
kfree(data);
@@ -288,7 +287,7 @@ static ssize_t snd_compr_write(struct file *f, const char __user *buf,
return -EFAULT;
stream = &data->stream;
- mutex_lock(&stream->device->lock);
+ guard(mutex)(&stream->device->lock);
/* write is allowed when stream is running or has been steup */
switch (stream->runtime->state) {
case SNDRV_PCM_STATE_SETUP:
@@ -296,7 +295,6 @@ static ssize_t snd_compr_write(struct file *f, const char __user *buf,
case SNDRV_PCM_STATE_RUNNING:
break;
default:
- mutex_unlock(&stream->device->lock);
return -EBADFD;
}
@@ -322,7 +320,6 @@ static ssize_t snd_compr_write(struct file *f, const char __user *buf,
pr_debug("stream prepared, Houston we are good to go\n");
}
- mutex_unlock(&stream->device->lock);
return retval;
}
@@ -339,7 +336,7 @@ static ssize_t snd_compr_read(struct file *f, char __user *buf,
return -EFAULT;
stream = &data->stream;
- mutex_lock(&stream->device->lock);
+ guard(mutex)(&stream->device->lock);
/* read is allowed when stream is running, paused, draining and setup
* (yes setup is state which we transition to after stop, so if user
@@ -350,11 +347,9 @@ static ssize_t snd_compr_read(struct file *f, char __user *buf,
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_SUSPENDED:
case SNDRV_PCM_STATE_DISCONNECTED:
- retval = -EBADFD;
- goto out;
+ return -EBADFD;
case SNDRV_PCM_STATE_XRUN:
- retval = -EPIPE;
- goto out;
+ return -EPIPE;
}
avail = snd_compr_get_avail(stream);
@@ -363,17 +358,13 @@ static ssize_t snd_compr_read(struct file *f, char __user *buf,
if (avail > count)
avail = count;
- if (stream->ops->copy) {
+ if (stream->ops->copy)
retval = stream->ops->copy(stream, buf, avail);
- } else {
- retval = -ENXIO;
- goto out;
- }
+ else
+ return -ENXIO;
if (retval > 0)
stream->runtime->total_bytes_transferred += retval;
-out:
- mutex_unlock(&stream->device->lock);
return retval;
}
@@ -402,13 +393,12 @@ static __poll_t snd_compr_poll(struct file *f, poll_table *wait)
stream = &data->stream;
- mutex_lock(&stream->device->lock);
+ guard(mutex)(&stream->device->lock);
switch (stream->runtime->state) {
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_XRUN:
- retval = snd_compr_get_poll(stream) | EPOLLERR;
- goto out;
+ return snd_compr_get_poll(stream) | EPOLLERR;
default:
break;
}
@@ -433,11 +423,9 @@ static __poll_t snd_compr_poll(struct file *f, poll_table *wait)
retval = snd_compr_get_poll(stream);
break;
default:
- retval = snd_compr_get_poll(stream) | EPOLLERR;
- break;
+ return snd_compr_get_poll(stream) | EPOLLERR;
}
-out:
- mutex_unlock(&stream->device->lock);
+
return retval;
}
@@ -795,12 +783,10 @@ static void error_delayed_work(struct work_struct *work)
stream = container_of(work, struct snd_compr_stream, error_work.work);
- mutex_lock(&stream->device->lock);
+ guard(mutex)(&stream->device->lock);
stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
wake_up(&stream->runtime->sleep);
-
- mutex_unlock(&stream->device->lock);
}
/**
@@ -957,70 +943,52 @@ static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
{
struct snd_compr_file *data = f->private_data;
struct snd_compr_stream *stream;
- int retval = -ENOTTY;
if (snd_BUG_ON(!data))
return -EFAULT;
stream = &data->stream;
- mutex_lock(&stream->device->lock);
+ guard(mutex)(&stream->device->lock);
switch (_IOC_NR(cmd)) {
case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
- retval = put_user(SNDRV_COMPRESS_VERSION,
+ return put_user(SNDRV_COMPRESS_VERSION,
(int __user *)arg) ? -EFAULT : 0;
- break;
case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
- retval = snd_compr_get_caps(stream, arg);
- break;
+ return snd_compr_get_caps(stream, arg);
#ifndef COMPR_CODEC_CAPS_OVERFLOW
case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
- retval = snd_compr_get_codec_caps(stream, arg);
- break;
+ return snd_compr_get_codec_caps(stream, arg);
#endif
case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
- retval = snd_compr_set_params(stream, arg);
- break;
+ return snd_compr_set_params(stream, arg);
case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
- retval = snd_compr_get_params(stream, arg);
- break;
+ return snd_compr_get_params(stream, arg);
case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
- retval = snd_compr_set_metadata(stream, arg);
- break;
+ return snd_compr_set_metadata(stream, arg);
case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
- retval = snd_compr_get_metadata(stream, arg);
- break;
+ return snd_compr_get_metadata(stream, arg);
case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
- retval = snd_compr_tstamp(stream, arg);
- break;
+ return snd_compr_tstamp(stream, arg);
case _IOC_NR(SNDRV_COMPRESS_AVAIL):
- retval = snd_compr_ioctl_avail(stream, arg);
- break;
+ return snd_compr_ioctl_avail(stream, arg);
case _IOC_NR(SNDRV_COMPRESS_PAUSE):
- retval = snd_compr_pause(stream);
- break;
+ return snd_compr_pause(stream);
case _IOC_NR(SNDRV_COMPRESS_RESUME):
- retval = snd_compr_resume(stream);
- break;
+ return snd_compr_resume(stream);
case _IOC_NR(SNDRV_COMPRESS_START):
- retval = snd_compr_start(stream);
- break;
+ return snd_compr_start(stream);
case _IOC_NR(SNDRV_COMPRESS_STOP):
- retval = snd_compr_stop(stream);
- break;
+ return snd_compr_stop(stream);
case _IOC_NR(SNDRV_COMPRESS_DRAIN):
- retval = snd_compr_drain(stream);
- break;
+ return snd_compr_drain(stream);
case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
- retval = snd_compr_partial_drain(stream);
- break;
+ return snd_compr_partial_drain(stream);
case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
- retval = snd_compr_next_track(stream);
- break;
-
+ return snd_compr_next_track(stream);
}
- mutex_unlock(&stream->device->lock);
- return retval;
+
+ return -ENOTTY;
}
/* support of 32bit userspace on 64bit platforms */
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 03/24] ALSA: timer: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
2024-02-23 16:27 ` [PATCH 01/24] ALSA: ump: Use guard() for locking Takashi Iwai
2024-02-23 16:27 ` [PATCH 02/24] ALSA: compress_offload: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 04/24] ALSA: hrtimer: " Takashi Iwai
` (20 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
For making changes easier, some functions widen the application of
register_mutex, but those shouldn't influence on any actual
performance.
Also, one code block was factored out as a function so that guard()
can be applied cleanly without much indentation.
There are still a few remaining explicit spin_lock/unlock calls, and
those are for the places where we do temporary unlock/relock, which
doesn't fit well with the guard(), so far.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/timer.c | 429 ++++++++++++++++----------------------
sound/core/timer_compat.c | 7 +-
2 files changed, 177 insertions(+), 259 deletions(-)
diff --git a/sound/core/timer.c b/sound/core/timer.c
index a595c4fb4b2a..15b07d09c4b7 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -224,14 +224,12 @@ static int check_matching_master_slave(struct snd_timer_instance *master,
return -EBUSY;
list_move_tail(&slave->open_list, &master->slave_list_head);
master->timer->num_instances++;
- spin_lock_irq(&slave_active_lock);
- spin_lock(&master->timer->lock);
+ guard(spinlock_irq)(&slave_active_lock);
+ guard(spinlock)(&master->timer->lock);
slave->master = master;
slave->timer = master->timer;
if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
list_add_tail(&slave->active_list, &master->slave_active_head);
- spin_unlock(&master->timer->lock);
- spin_unlock_irq(&slave_active_lock);
return 1;
}
@@ -382,6 +380,25 @@ int snd_timer_open(struct snd_timer_instance *timeri,
}
EXPORT_SYMBOL(snd_timer_open);
+/* remove slave links, called from snd_timer_close_locked() below */
+static void remove_slave_links(struct snd_timer_instance *timeri,
+ struct snd_timer *timer)
+{
+ struct snd_timer_instance *slave, *tmp;
+
+ guard(spinlock_irq)(&slave_active_lock);
+ guard(spinlock)(&timer->lock);
+ timeri->timer = NULL;
+ list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, open_list) {
+ list_move_tail(&slave->open_list, &snd_timer_slave_list);
+ timer->num_instances--;
+ slave->master = NULL;
+ slave->timer = NULL;
+ list_del_init(&slave->ack_list);
+ list_del_init(&slave->active_list);
+ }
+}
+
/*
* close a timer instance
* call this with register_mutex down.
@@ -390,12 +407,10 @@ static void snd_timer_close_locked(struct snd_timer_instance *timeri,
struct device **card_devp_to_put)
{
struct snd_timer *timer = timeri->timer;
- struct snd_timer_instance *slave, *tmp;
if (timer) {
- spin_lock_irq(&timer->lock);
+ guard(spinlock)(&timer->lock);
timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
- spin_unlock_irq(&timer->lock);
}
if (!list_empty(&timeri->open_list)) {
@@ -418,21 +433,7 @@ static void snd_timer_close_locked(struct snd_timer_instance *timeri,
}
spin_unlock_irq(&timer->lock);
- /* remove slave links */
- spin_lock_irq(&slave_active_lock);
- spin_lock(&timer->lock);
- timeri->timer = NULL;
- list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
- open_list) {
- list_move_tail(&slave->open_list, &snd_timer_slave_list);
- timer->num_instances--;
- slave->master = NULL;
- slave->timer = NULL;
- list_del_init(&slave->ack_list);
- list_del_init(&slave->active_list);
- }
- spin_unlock(&timer->lock);
- spin_unlock_irq(&slave_active_lock);
+ remove_slave_links(timeri, timer);
/* slave doesn't need to release timer resources below */
if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
@@ -459,9 +460,8 @@ void snd_timer_close(struct snd_timer_instance *timeri)
if (snd_BUG_ON(!timeri))
return;
- mutex_lock(®ister_mutex);
- snd_timer_close_locked(timeri, &card_dev_to_put);
- mutex_unlock(®ister_mutex);
+ scoped_guard(mutex, ®ister_mutex)
+ snd_timer_close_locked(timeri, &card_dev_to_put);
/* put_device() is called after unlock for avoiding deadlock */
if (card_dev_to_put)
put_device(card_dev_to_put);
@@ -480,15 +480,13 @@ unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
{
struct snd_timer * timer;
unsigned long ret = 0;
- unsigned long flags;
if (timeri == NULL)
return 0;
timer = timeri->timer;
if (timer) {
- spin_lock_irqsave(&timer->lock, flags);
+ guard(spinlock_irqsave)(&timer->lock);
ret = snd_timer_hw_resolution(timer);
- spin_unlock_irqrestore(&timer->lock, flags);
}
return ret;
}
@@ -532,26 +530,19 @@ static int snd_timer_start1(struct snd_timer_instance *timeri,
{
struct snd_timer *timer;
int result;
- unsigned long flags;
timer = timeri->timer;
if (!timer)
return -EINVAL;
- spin_lock_irqsave(&timer->lock, flags);
- if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
- result = -EINVAL;
- goto unlock;
- }
- if (timer->card && timer->card->shutdown) {
- result = -ENODEV;
- goto unlock;
- }
+ guard(spinlock_irqsave)(&timer->lock);
+ if (timeri->flags & SNDRV_TIMER_IFLG_DEAD)
+ return -EINVAL;
+ if (timer->card && timer->card->shutdown)
+ return -ENODEV;
if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
- SNDRV_TIMER_IFLG_START)) {
- result = -EBUSY;
- goto unlock;
- }
+ SNDRV_TIMER_IFLG_START))
+ return -EBUSY;
if (start)
timeri->ticks = timeri->cticks = ticks;
@@ -577,8 +568,6 @@ static int snd_timer_start1(struct snd_timer_instance *timeri,
}
snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
SNDRV_TIMER_EVENT_CONTINUE);
- unlock:
- spin_unlock_irqrestore(&timer->lock, flags);
return result;
}
@@ -586,53 +575,38 @@ static int snd_timer_start1(struct snd_timer_instance *timeri,
static int snd_timer_start_slave(struct snd_timer_instance *timeri,
bool start)
{
- unsigned long flags;
- int err;
-
- spin_lock_irqsave(&slave_active_lock, flags);
- if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
- err = -EINVAL;
- goto unlock;
- }
- if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
- err = -EBUSY;
- goto unlock;
- }
+ guard(spinlock_irqsave)(&slave_active_lock);
+ if (timeri->flags & SNDRV_TIMER_IFLG_DEAD)
+ return -EINVAL;
+ if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING)
+ return -EBUSY;
timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
if (timeri->master && timeri->timer) {
- spin_lock(&timeri->timer->lock);
+ guard(spinlock)(&timeri->timer->lock);
list_add_tail(&timeri->active_list,
&timeri->master->slave_active_head);
snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
SNDRV_TIMER_EVENT_CONTINUE);
- spin_unlock(&timeri->timer->lock);
}
- err = 1; /* delayed start */
- unlock:
- spin_unlock_irqrestore(&slave_active_lock, flags);
- return err;
+ return 1; /* delayed start */
}
/* stop/pause a master timer */
static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
{
struct snd_timer *timer;
- int result = 0;
- unsigned long flags;
timer = timeri->timer;
if (!timer)
return -EINVAL;
- spin_lock_irqsave(&timer->lock, flags);
+ guard(spinlock_irqsave)(&timer->lock);
list_del_init(&timeri->ack_list);
list_del_init(&timeri->active_list);
if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
- SNDRV_TIMER_IFLG_START))) {
- result = -EBUSY;
- goto unlock;
- }
+ SNDRV_TIMER_IFLG_START)))
+ return -EBUSY;
if (timer->card && timer->card->shutdown)
- goto unlock;
+ return 0;
if (stop) {
timeri->cticks = timeri->ticks;
timeri->pticks = 0;
@@ -656,30 +630,25 @@ static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
SNDRV_TIMER_EVENT_PAUSE);
- unlock:
- spin_unlock_irqrestore(&timer->lock, flags);
- return result;
+ return 0;
}
/* stop/pause a slave timer */
static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
{
- unsigned long flags;
bool running;
- spin_lock_irqsave(&slave_active_lock, flags);
+ guard(spinlock_irqsave)(&slave_active_lock);
running = timeri->flags & SNDRV_TIMER_IFLG_RUNNING;
timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
if (timeri->timer) {
- spin_lock(&timeri->timer->lock);
+ guard(spinlock)(&timeri->timer->lock);
list_del_init(&timeri->ack_list);
list_del_init(&timeri->active_list);
if (running)
snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
SNDRV_TIMER_EVENT_PAUSE);
- spin_unlock(&timeri->timer->lock);
}
- spin_unlock_irqrestore(&slave_active_lock, flags);
return running ? 0 : -EBUSY;
}
@@ -804,12 +773,9 @@ static void snd_timer_process_callbacks(struct snd_timer *timer,
static void snd_timer_clear_callbacks(struct snd_timer *timer,
struct list_head *head)
{
- unsigned long flags;
-
- spin_lock_irqsave(&timer->lock, flags);
+ guard(spinlock_irqsave)(&timer->lock);
while (!list_empty(head))
list_del_init(head->next);
- spin_unlock_irqrestore(&timer->lock, flags);
}
/*
@@ -819,16 +785,14 @@ static void snd_timer_clear_callbacks(struct snd_timer *timer,
static void snd_timer_work(struct work_struct *work)
{
struct snd_timer *timer = container_of(work, struct snd_timer, task_work);
- unsigned long flags;
if (timer->card && timer->card->shutdown) {
snd_timer_clear_callbacks(timer, &timer->sack_list_head);
return;
}
- spin_lock_irqsave(&timer->lock, flags);
+ guard(spinlock_irqsave)(&timer->lock);
snd_timer_process_callbacks(timer, &timer->sack_list_head);
- spin_unlock_irqrestore(&timer->lock, flags);
}
/*
@@ -842,8 +806,6 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
struct snd_timer_instance *ti, *ts, *tmp;
unsigned long resolution;
struct list_head *ack_list_head;
- unsigned long flags;
- bool use_work = false;
if (timer == NULL)
return;
@@ -853,7 +815,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
return;
}
- spin_lock_irqsave(&timer->lock, flags);
+ guard(spinlock_irqsave)(&timer->lock);
/* remember the current resolution */
resolution = snd_timer_hw_resolution(timer);
@@ -919,10 +881,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
snd_timer_process_callbacks(timer, &timer->ack_list_head);
/* do we have any slow callbacks? */
- use_work = !list_empty(&timer->sack_list_head);
- spin_unlock_irqrestore(&timer->lock, flags);
-
- if (use_work)
+ if (!list_empty(&timer->sack_list_head))
queue_work(system_highpri_wq, &timer->task_work);
}
EXPORT_SYMBOL(snd_timer_interrupt);
@@ -988,7 +947,7 @@ static int snd_timer_free(struct snd_timer *timer)
if (!timer)
return 0;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
if (! list_empty(&timer->open_list_head)) {
struct list_head *p, *n;
struct snd_timer_instance *ti;
@@ -1000,7 +959,6 @@ static int snd_timer_free(struct snd_timer *timer)
}
}
list_del(&timer->device_list);
- mutex_unlock(®ister_mutex);
if (timer->private_free)
timer->private_free(timer);
@@ -1025,7 +983,7 @@ static int snd_timer_dev_register(struct snd_device *dev)
!timer->hw.resolution && timer->hw.c_resolution == NULL)
return -EINVAL;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
list_for_each_entry(timer1, &snd_timer_list, device_list) {
if (timer1->tmr_class > timer->tmr_class)
break;
@@ -1046,11 +1004,9 @@ static int snd_timer_dev_register(struct snd_device *dev)
if (timer1->tmr_subdevice < timer->tmr_subdevice)
continue;
/* conflicts.. */
- mutex_unlock(®ister_mutex);
return -EBUSY;
}
list_add_tail(&timer->device_list, &timer1->device_list);
- mutex_unlock(®ister_mutex);
return 0;
}
@@ -1059,20 +1015,18 @@ static int snd_timer_dev_disconnect(struct snd_device *device)
struct snd_timer *timer = device->device_data;
struct snd_timer_instance *ti;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
list_del_init(&timer->device_list);
/* wake up pending sleepers */
list_for_each_entry(ti, &timer->open_list_head, open_list) {
if (ti->disconnect)
ti->disconnect(ti);
}
- mutex_unlock(®ister_mutex);
return 0;
}
void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp)
{
- unsigned long flags;
unsigned long resolution = 0;
struct snd_timer_instance *ti, *ts;
@@ -1083,7 +1037,7 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tst
if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
event > SNDRV_TIMER_EVENT_MRESUME))
return;
- spin_lock_irqsave(&timer->lock, flags);
+ guard(spinlock_irqsave)(&timer->lock);
if (event == SNDRV_TIMER_EVENT_MSTART ||
event == SNDRV_TIMER_EVENT_MCONTINUE ||
event == SNDRV_TIMER_EVENT_MRESUME)
@@ -1095,7 +1049,6 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tst
if (ts->ccallback)
ts->ccallback(ts, event, tstamp, resolution);
}
- spin_unlock_irqrestore(&timer->lock, flags);
}
EXPORT_SYMBOL(snd_timer_notify);
@@ -1248,7 +1201,7 @@ static void snd_timer_proc_read(struct snd_info_entry *entry,
struct snd_timer_instance *ti;
unsigned long resolution;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
list_for_each_entry(timer, &snd_timer_list, device_list) {
if (timer->card && timer->card->shutdown)
continue;
@@ -1270,9 +1223,8 @@ static void snd_timer_proc_read(struct snd_info_entry *entry,
timer->tmr_device, timer->tmr_subdevice);
}
snd_iprintf(buffer, "%s :", timer->name);
- spin_lock_irq(&timer->lock);
- resolution = snd_timer_hw_resolution(timer);
- spin_unlock_irq(&timer->lock);
+ scoped_guard(spinlock_irq, &timer->lock)
+ resolution = snd_timer_hw_resolution(timer);
if (resolution)
snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
resolution / 1000,
@@ -1288,7 +1240,6 @@ static void snd_timer_proc_read(struct snd_info_entry *entry,
SNDRV_TIMER_IFLG_RUNNING))
? "running" : "stopped");
}
- mutex_unlock(®ister_mutex);
}
static struct snd_info_entry *snd_timer_proc_entry;
@@ -1329,7 +1280,7 @@ static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
struct snd_timer_read *r;
int prev;
- spin_lock(&tu->qlock);
+ guard(spinlock)(&tu->qlock);
if (tu->qused > 0) {
prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
r = &tu->queue[prev];
@@ -1348,7 +1299,6 @@ static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
tu->qused++;
}
__wake:
- spin_unlock(&tu->qlock);
snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
wake_up(&tu->qchange_sleep);
}
@@ -1372,7 +1322,6 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
{
struct snd_timer_user *tu = timeri->callback_data;
struct snd_timer_tread64 r1;
- unsigned long flags;
if (event >= SNDRV_TIMER_EVENT_START &&
event <= SNDRV_TIMER_EVENT_PAUSE)
@@ -1384,9 +1333,8 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
r1.tstamp_sec = tstamp->tv_sec;
r1.tstamp_nsec = tstamp->tv_nsec;
r1.val = resolution;
- spin_lock_irqsave(&tu->qlock, flags);
- snd_timer_user_append_to_tqueue(tu, &r1);
- spin_unlock_irqrestore(&tu->qlock, flags);
+ scoped_guard(spinlock_irqsave, &tu->qlock)
+ snd_timer_user_append_to_tqueue(tu, &r1);
snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
wake_up(&tu->qchange_sleep);
}
@@ -1410,51 +1358,48 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
memset(&r1, 0, sizeof(r1));
memset(&tstamp, 0, sizeof(tstamp));
- spin_lock(&tu->qlock);
- if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
- (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
- spin_unlock(&tu->qlock);
- return;
- }
- if (tu->last_resolution != resolution || ticks > 0) {
- if (timer_tstamp_monotonic)
- ktime_get_ts64(&tstamp);
- else
- ktime_get_real_ts64(&tstamp);
- }
- if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
- tu->last_resolution != resolution) {
- r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
+ scoped_guard(spinlock, &tu->qlock) {
+ if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
+ (1 << SNDRV_TIMER_EVENT_TICK))) == 0)
+ return;
+ if (tu->last_resolution != resolution || ticks > 0) {
+ if (timer_tstamp_monotonic)
+ ktime_get_ts64(&tstamp);
+ else
+ ktime_get_real_ts64(&tstamp);
+ }
+ if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
+ tu->last_resolution != resolution) {
+ r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
+ r1.tstamp_sec = tstamp.tv_sec;
+ r1.tstamp_nsec = tstamp.tv_nsec;
+ r1.val = resolution;
+ snd_timer_user_append_to_tqueue(tu, &r1);
+ tu->last_resolution = resolution;
+ append++;
+ }
+ if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
+ break;
+ if (ticks == 0)
+ break;
+ if (tu->qused > 0) {
+ prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
+ r = &tu->tqueue[prev];
+ if (r->event == SNDRV_TIMER_EVENT_TICK) {
+ r->tstamp_sec = tstamp.tv_sec;
+ r->tstamp_nsec = tstamp.tv_nsec;
+ r->val += ticks;
+ append++;
+ break;
+ }
+ }
+ r1.event = SNDRV_TIMER_EVENT_TICK;
r1.tstamp_sec = tstamp.tv_sec;
r1.tstamp_nsec = tstamp.tv_nsec;
- r1.val = resolution;
+ r1.val = ticks;
snd_timer_user_append_to_tqueue(tu, &r1);
- tu->last_resolution = resolution;
append++;
}
- if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
- goto __wake;
- if (ticks == 0)
- goto __wake;
- if (tu->qused > 0) {
- prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
- r = &tu->tqueue[prev];
- if (r->event == SNDRV_TIMER_EVENT_TICK) {
- r->tstamp_sec = tstamp.tv_sec;
- r->tstamp_nsec = tstamp.tv_nsec;
- r->val += ticks;
- append++;
- goto __wake;
- }
- }
- r1.event = SNDRV_TIMER_EVENT_TICK;
- r1.tstamp_sec = tstamp.tv_sec;
- r1.tstamp_nsec = tstamp.tv_nsec;
- r1.val = ticks;
- snd_timer_user_append_to_tqueue(tu, &r1);
- append++;
- __wake:
- spin_unlock(&tu->qlock);
if (append == 0)
return;
snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
@@ -1476,14 +1421,13 @@ static int realloc_user_queue(struct snd_timer_user *tu, int size)
return -ENOMEM;
}
- spin_lock_irq(&tu->qlock);
+ guard(spinlock_irq)(&tu->qlock);
kfree(tu->queue);
kfree(tu->tqueue);
tu->queue_size = size;
tu->queue = queue;
tu->tqueue = tqueue;
tu->qhead = tu->qtail = tu->qused = 0;
- spin_unlock_irq(&tu->qlock);
return 0;
}
@@ -1519,12 +1463,12 @@ static int snd_timer_user_release(struct inode *inode, struct file *file)
if (file->private_data) {
tu = file->private_data;
file->private_data = NULL;
- mutex_lock(&tu->ioctl_lock);
- if (tu->timeri) {
- snd_timer_close(tu->timeri);
- snd_timer_instance_free(tu->timeri);
+ scoped_guard(mutex, &tu->ioctl_lock) {
+ if (tu->timeri) {
+ snd_timer_close(tu->timeri);
+ snd_timer_instance_free(tu->timeri);
+ }
}
- mutex_unlock(&tu->ioctl_lock);
snd_fasync_free(tu->fasync);
kfree(tu->queue);
kfree(tu->tqueue);
@@ -1559,7 +1503,7 @@ static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
if (copy_from_user(&id, _tid, sizeof(id)))
return -EFAULT;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
if (id.dev_class < 0) { /* first item */
if (list_empty(&snd_timer_list))
snd_timer_user_zero_id(&id);
@@ -1636,7 +1580,6 @@ static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
snd_timer_user_zero_id(&id);
}
}
- mutex_unlock(®ister_mutex);
if (copy_to_user(_tid, &id, sizeof(*_tid)))
return -EFAULT;
return 0;
@@ -1649,7 +1592,6 @@ static int snd_timer_user_ginfo(struct file *file,
struct snd_timer_id tid;
struct snd_timer *t;
struct list_head *p;
- int err = 0;
ginfo = memdup_user(_ginfo, sizeof(*ginfo));
if (IS_ERR(ginfo))
@@ -1658,56 +1600,42 @@ static int snd_timer_user_ginfo(struct file *file,
tid = ginfo->tid;
memset(ginfo, 0, sizeof(*ginfo));
ginfo->tid = tid;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
t = snd_timer_find(&tid);
- if (t != NULL) {
- ginfo->card = t->card ? t->card->number : -1;
- if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
- ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
- strscpy(ginfo->id, t->id, sizeof(ginfo->id));
- strscpy(ginfo->name, t->name, sizeof(ginfo->name));
- spin_lock_irq(&t->lock);
+ if (!t)
+ return -ENODEV;
+ ginfo->card = t->card ? t->card->number : -1;
+ if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
+ ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
+ strscpy(ginfo->id, t->id, sizeof(ginfo->id));
+ strscpy(ginfo->name, t->name, sizeof(ginfo->name));
+ scoped_guard(spinlock_irq, &t->lock)
ginfo->resolution = snd_timer_hw_resolution(t);
- spin_unlock_irq(&t->lock);
- if (t->hw.resolution_min > 0) {
- ginfo->resolution_min = t->hw.resolution_min;
- ginfo->resolution_max = t->hw.resolution_max;
- }
- list_for_each(p, &t->open_list_head) {
- ginfo->clients++;
- }
- } else {
- err = -ENODEV;
+ if (t->hw.resolution_min > 0) {
+ ginfo->resolution_min = t->hw.resolution_min;
+ ginfo->resolution_max = t->hw.resolution_max;
}
- mutex_unlock(®ister_mutex);
- if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
- err = -EFAULT;
- return err;
+ list_for_each(p, &t->open_list_head) {
+ ginfo->clients++;
+ }
+ if (copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
+ return -EFAULT;
+ return 0;
}
static int timer_set_gparams(struct snd_timer_gparams *gparams)
{
struct snd_timer *t;
- int err;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
t = snd_timer_find(&gparams->tid);
- if (!t) {
- err = -ENODEV;
- goto _error;
- }
- if (!list_empty(&t->open_list_head)) {
- err = -EBUSY;
- goto _error;
- }
- if (!t->hw.set_period) {
- err = -ENOSYS;
- goto _error;
- }
- err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
-_error:
- mutex_unlock(®ister_mutex);
- return err;
+ if (!t)
+ return -ENODEV;
+ if (!list_empty(&t->open_list_head))
+ return -EBUSY;
+ if (!t->hw.set_period)
+ return -ENOSYS;
+ return t->hw.set_period(t, gparams->period_num, gparams->period_den);
}
static int snd_timer_user_gparams(struct file *file,
@@ -1733,10 +1661,10 @@ static int snd_timer_user_gstatus(struct file *file,
tid = gstatus.tid;
memset(&gstatus, 0, sizeof(gstatus));
gstatus.tid = tid;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
t = snd_timer_find(&tid);
if (t != NULL) {
- spin_lock_irq(&t->lock);
+ guard(spinlock_irq)(&t->lock);
gstatus.resolution = snd_timer_hw_resolution(t);
if (t->hw.precise_resolution) {
t->hw.precise_resolution(t, &gstatus.resolution_num,
@@ -1745,11 +1673,9 @@ static int snd_timer_user_gstatus(struct file *file,
gstatus.resolution_num = gstatus.resolution;
gstatus.resolution_den = 1000000000uL;
}
- spin_unlock_irq(&t->lock);
} else {
err = -ENODEV;
}
- mutex_unlock(®ister_mutex);
if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
err = -EFAULT;
return err;
@@ -1821,9 +1747,8 @@ static int snd_timer_user_info(struct file *file,
info->flags |= SNDRV_TIMER_FLG_SLAVE;
strscpy(info->id, t->id, sizeof(info->id));
strscpy(info->name, t->name, sizeof(info->name));
- spin_lock_irq(&t->lock);
- info->resolution = snd_timer_hw_resolution(t);
- spin_unlock_irq(&t->lock);
+ scoped_guard(spinlock_irq, &t->lock)
+ info->resolution = snd_timer_hw_resolution(t);
if (copy_to_user(_info, info, sizeof(*_info)))
return -EFAULT;
return 0;
@@ -1884,45 +1809,47 @@ static int snd_timer_user_params(struct file *file,
goto _end;
}
snd_timer_stop(tu->timeri);
- spin_lock_irq(&t->lock);
- tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
- SNDRV_TIMER_IFLG_EXCLUSIVE|
- SNDRV_TIMER_IFLG_EARLY_EVENT);
- if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
- tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
- if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
- tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
- if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
- tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
- spin_unlock_irq(&t->lock);
+ scoped_guard(spinlock_irq, &t->lock) {
+ tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
+ SNDRV_TIMER_IFLG_EXCLUSIVE|
+ SNDRV_TIMER_IFLG_EARLY_EVENT);
+ if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
+ tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
+ if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
+ tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
+ if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
+ tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
+ }
if (params.queue_size > 0 &&
(unsigned int)tu->queue_size != params.queue_size) {
err = realloc_user_queue(tu, params.queue_size);
if (err < 0)
goto _end;
}
- spin_lock_irq(&tu->qlock);
- tu->qhead = tu->qtail = tu->qused = 0;
- if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
- if (tu->tread) {
- struct snd_timer_tread64 tread;
- memset(&tread, 0, sizeof(tread));
- tread.event = SNDRV_TIMER_EVENT_EARLY;
- tread.tstamp_sec = 0;
- tread.tstamp_nsec = 0;
- tread.val = 0;
- snd_timer_user_append_to_tqueue(tu, &tread);
- } else {
- struct snd_timer_read *r = &tu->queue[0];
- r->resolution = 0;
- r->ticks = 0;
- tu->qused++;
- tu->qtail++;
+ scoped_guard(spinlock_irq, &tu->qlock) {
+ tu->qhead = tu->qtail = tu->qused = 0;
+ if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
+ if (tu->tread) {
+ struct snd_timer_tread64 tread;
+
+ memset(&tread, 0, sizeof(tread));
+ tread.event = SNDRV_TIMER_EVENT_EARLY;
+ tread.tstamp_sec = 0;
+ tread.tstamp_nsec = 0;
+ tread.val = 0;
+ snd_timer_user_append_to_tqueue(tu, &tread);
+ } else {
+ struct snd_timer_read *r = &tu->queue[0];
+
+ r->resolution = 0;
+ r->ticks = 0;
+ tu->qused++;
+ tu->qtail++;
+ }
}
+ tu->filter = params.filter;
+ tu->ticks = params.ticks;
}
- tu->filter = params.filter;
- tu->ticks = params.ticks;
- spin_unlock_irq(&tu->qlock);
err = 0;
_end:
if (copy_to_user(_params, ¶ms, sizeof(params)))
@@ -1945,9 +1872,8 @@ static int snd_timer_user_status32(struct file *file,
status.resolution = snd_timer_resolution(tu->timeri);
status.lost = tu->timeri->lost;
status.overrun = tu->overrun;
- spin_lock_irq(&tu->qlock);
- status.queue = tu->qused;
- spin_unlock_irq(&tu->qlock);
+ scoped_guard(spinlock_irq, &tu->qlock)
+ status.queue = tu->qused;
if (copy_to_user(_status, &status, sizeof(status)))
return -EFAULT;
return 0;
@@ -1968,9 +1894,8 @@ static int snd_timer_user_status64(struct file *file,
status.resolution = snd_timer_resolution(tu->timeri);
status.lost = tu->timeri->lost;
status.overrun = tu->overrun;
- spin_lock_irq(&tu->qlock);
- status.queue = tu->qused;
- spin_unlock_irq(&tu->qlock);
+ scoped_guard(spinlock_irq, &tu->qlock)
+ status.queue = tu->qused;
if (copy_to_user(_status, &status, sizeof(status)))
return -EFAULT;
return 0;
@@ -2128,12 +2053,9 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct snd_timer_user *tu = file->private_data;
- long ret;
- mutex_lock(&tu->ioctl_lock);
- ret = __snd_timer_user_ioctl(file, cmd, arg, false);
- mutex_unlock(&tu->ioctl_lock);
- return ret;
+ guard(mutex)(&tu->ioctl_lock);
+ return __snd_timer_user_ioctl(file, cmd, arg, false);
}
static int snd_timer_user_fasync(int fd, struct file * file, int on)
@@ -2260,12 +2182,11 @@ static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
poll_wait(file, &tu->qchange_sleep, wait);
mask = 0;
- spin_lock_irq(&tu->qlock);
+ guard(spinlock_irq)(&tu->qlock);
if (tu->qused)
mask |= EPOLLIN | EPOLLRDNORM;
if (tu->disconnected)
mask |= EPOLLERR;
- spin_unlock_irq(&tu->qlock);
return mask;
}
diff --git a/sound/core/timer_compat.c b/sound/core/timer_compat.c
index ee973b7b8044..4ae9eaeb5afb 100644
--- a/sound/core/timer_compat.c
+++ b/sound/core/timer_compat.c
@@ -115,10 +115,7 @@ static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct snd_timer_user *tu = file->private_data;
- long ret;
- mutex_lock(&tu->ioctl_lock);
- ret = __snd_timer_user_ioctl_compat(file, cmd, arg);
- mutex_unlock(&tu->ioctl_lock);
- return ret;
+ guard(mutex)(&tu->ioctl_lock);
+ return __snd_timer_user_ioctl_compat(file, cmd, arg);
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 04/24] ALSA: hrtimer: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (2 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 03/24] ALSA: timer: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 05/24] ALSA: hwdep: " Takashi Iwai
` (19 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/hrtimer.c | 24 +++++++++++-------------
1 file changed, 11 insertions(+), 13 deletions(-)
diff --git a/sound/core/hrtimer.c b/sound/core/hrtimer.c
index e97ff8cccb64..147c1fea4708 100644
--- a/sound/core/hrtimer.c
+++ b/sound/core/hrtimer.c
@@ -35,12 +35,12 @@ static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
unsigned long ticks;
enum hrtimer_restart ret = HRTIMER_NORESTART;
- spin_lock(&t->lock);
- if (!t->running)
- goto out; /* fast path */
- stime->in_callback = true;
- ticks = t->sticks;
- spin_unlock(&t->lock);
+ scoped_guard(spinlock, &t->lock) {
+ if (!t->running)
+ return HRTIMER_NORESTART; /* fast path */
+ stime->in_callback = true;
+ ticks = t->sticks;
+ }
/* calculate the drift */
delta = ktime_sub(hrt->base->get_time(), hrtimer_get_expires(hrt));
@@ -49,15 +49,13 @@ static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
snd_timer_interrupt(stime->timer, ticks);
- spin_lock(&t->lock);
+ guard(spinlock)(&t->lock);
if (t->running) {
hrtimer_add_expires_ns(hrt, t->sticks * resolution);
ret = HRTIMER_RESTART;
}
stime->in_callback = false;
- out:
- spin_unlock(&t->lock);
return ret;
}
@@ -80,10 +78,10 @@ static int snd_hrtimer_close(struct snd_timer *t)
struct snd_hrtimer *stime = t->private_data;
if (stime) {
- spin_lock_irq(&t->lock);
- t->running = 0; /* just to be sure */
- stime->in_callback = 1; /* skip start/stop */
- spin_unlock_irq(&t->lock);
+ scoped_guard(spinlock_irq, &t->lock) {
+ t->running = 0; /* just to be sure */
+ stime->in_callback = 1; /* skip start/stop */
+ }
hrtimer_cancel(&stime->hrt);
kfree(stime);
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 05/24] ALSA: hwdep: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (3 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 04/24] ALSA: hrtimer: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 06/24] ALSA: info: " Takashi Iwai
` (18 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
There are still a few remaining explicit mutex_lock/unlock calls, and
those are for the places where we do temporary unlock/relock, which
doesn't fit well with the guard(), so far.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/hwdep.c | 49 +++++++++++++++++-----------------------------
1 file changed, 18 insertions(+), 31 deletions(-)
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index de7476034f2c..09e2398bb6d0 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -149,12 +149,12 @@ static int snd_hwdep_release(struct inode *inode, struct file * file)
struct snd_hwdep *hw = file->private_data;
struct module *mod = hw->card->module;
- mutex_lock(&hw->open_mutex);
- if (hw->ops.release)
- err = hw->ops.release(hw, file);
- if (hw->used > 0)
- hw->used--;
- mutex_unlock(&hw->open_mutex);
+ scoped_guard(mutex, &hw->open_mutex) {
+ if (hw->ops.release)
+ err = hw->ops.release(hw, file);
+ if (hw->used > 0)
+ hw->used--;
+ }
wake_up(&hw->open_wait);
snd_card_file_remove(hw->card, file);
@@ -272,8 +272,8 @@ static int snd_hwdep_control_ioctl(struct snd_card *card,
if (get_user(device, (int __user *)arg))
return -EFAULT;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
if (device < 0)
device = 0;
else if (device < SNDRV_MINOR_HWDEPS)
@@ -288,7 +288,6 @@ static int snd_hwdep_control_ioctl(struct snd_card *card,
}
if (device >= SNDRV_MINOR_HWDEPS)
device = -1;
- mutex_unlock(®ister_mutex);
if (put_user(device, (int __user *)arg))
return -EFAULT;
return 0;
@@ -296,19 +295,16 @@ static int snd_hwdep_control_ioctl(struct snd_card *card,
case SNDRV_CTL_IOCTL_HWDEP_INFO:
{
struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
- int device, err;
+ int device;
struct snd_hwdep *hwdep;
if (get_user(device, &info->device))
return -EFAULT;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
hwdep = snd_hwdep_search(card, device);
- if (hwdep)
- err = snd_hwdep_info(hwdep, info);
- else
- err = -ENXIO;
- mutex_unlock(®ister_mutex);
- return err;
+ if (!hwdep)
+ return -ENXIO;
+ return snd_hwdep_info(hwdep, info);
}
}
return -ENOIOCTLCMD;
@@ -422,11 +418,9 @@ static int snd_hwdep_dev_register(struct snd_device *device)
struct snd_card *card = hwdep->card;
int err;
- mutex_lock(®ister_mutex);
- if (snd_hwdep_search(card, hwdep->device)) {
- mutex_unlock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
+ if (snd_hwdep_search(card, hwdep->device))
return -EBUSY;
- }
list_add_tail(&hwdep->list, &snd_hwdep_devices);
err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
hwdep->card, hwdep->device,
@@ -434,7 +428,6 @@ static int snd_hwdep_dev_register(struct snd_device *device)
if (err < 0) {
dev_err(hwdep->dev, "unable to register\n");
list_del(&hwdep->list);
- mutex_unlock(®ister_mutex);
return err;
}
@@ -454,7 +447,6 @@ static int snd_hwdep_dev_register(struct snd_device *device)
hwdep->ossreg = 1;
}
#endif
- mutex_unlock(®ister_mutex);
return 0;
}
@@ -464,12 +456,10 @@ static int snd_hwdep_dev_disconnect(struct snd_device *device)
if (snd_BUG_ON(!hwdep))
return -ENXIO;
- mutex_lock(®ister_mutex);
- if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
- mutex_unlock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
+ if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep)
return -EINVAL;
- }
- mutex_lock(&hwdep->open_mutex);
+ guard(mutex)(&hwdep->open_mutex);
wake_up(&hwdep->open_wait);
#ifdef CONFIG_SND_OSSEMUL
if (hwdep->ossreg)
@@ -477,8 +467,6 @@ static int snd_hwdep_dev_disconnect(struct snd_device *device)
#endif
snd_unregister_device(hwdep->dev);
list_del_init(&hwdep->list);
- mutex_unlock(&hwdep->open_mutex);
- mutex_unlock(®ister_mutex);
return 0;
}
@@ -492,11 +480,10 @@ static void snd_hwdep_proc_read(struct snd_info_entry *entry,
{
struct snd_hwdep *hwdep;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
list_for_each_entry(hwdep, &snd_hwdep_devices, list)
snd_iprintf(buffer, "%02i-%02i: %s\n",
hwdep->card->number, hwdep->device, hwdep->name);
- mutex_unlock(®ister_mutex);
}
static struct snd_info_entry *snd_hwdep_proc_entry;
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 06/24] ALSA: info: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (4 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 05/24] ALSA: hwdep: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 07/24] ALSA: mixer_oss: " Takashi Iwai
` (17 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/info.c | 93 ++++++++++++++-----------------------------
sound/core/info_oss.c | 10 ++---
2 files changed, 33 insertions(+), 70 deletions(-)
diff --git a/sound/core/info.c b/sound/core/info.c
index e2f302e55bbb..1f5b8a3d9e3b 100644
--- a/sound/core/info.c
+++ b/sound/core/info.c
@@ -105,17 +105,15 @@ static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
{
struct snd_info_private_data *data;
struct snd_info_entry *entry;
- loff_t ret = -EINVAL, size;
+ loff_t size;
data = file->private_data;
entry = data->entry;
- mutex_lock(&entry->access);
- if (entry->c.ops->llseek) {
- ret = entry->c.ops->llseek(entry,
- data->file_private_data,
- file, offset, orig);
- goto out;
- }
+ guard(mutex)(&entry->access);
+ if (entry->c.ops->llseek)
+ return entry->c.ops->llseek(entry,
+ data->file_private_data,
+ file, offset, orig);
size = entry->size;
switch (orig) {
@@ -126,21 +124,18 @@ static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
break;
case SEEK_END:
if (!size)
- goto out;
+ return -EINVAL;
offset += size;
break;
default:
- goto out;
+ return -EINVAL;
}
if (offset < 0)
- goto out;
+ return -EINVAL;
if (size && offset > size)
offset = size;
file->f_pos = offset;
- ret = offset;
- out:
- mutex_unlock(&entry->access);
- return ret;
+ return offset;
}
static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
@@ -238,10 +233,10 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
struct snd_info_private_data *data;
int mode, err;
- mutex_lock(&info_mutex);
+ guard(mutex)(&info_mutex);
err = alloc_info_private(entry, &data);
if (err < 0)
- goto unlock;
+ return err;
mode = file->f_flags & O_ACCMODE;
if (((mode == O_RDONLY || mode == O_RDWR) && !entry->c.ops->read) ||
@@ -257,14 +252,11 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
}
file->private_data = data;
- mutex_unlock(&info_mutex);
return 0;
error:
kfree(data);
module_put(entry->module);
- unlock:
- mutex_unlock(&info_mutex);
return err;
}
@@ -306,7 +298,6 @@ static ssize_t snd_info_text_entry_write(struct file *file,
struct snd_info_buffer *buf;
loff_t pos;
size_t next;
- int err = 0;
if (!entry->c.text.write)
return -EIO;
@@ -317,34 +308,24 @@ static ssize_t snd_info_text_entry_write(struct file *file,
/* don't handle too large text inputs */
if (next > 16 * 1024)
return -EIO;
- mutex_lock(&entry->access);
+ guard(mutex)(&entry->access);
buf = data->wbuffer;
if (!buf) {
data->wbuffer = buf = kzalloc(sizeof(*buf), GFP_KERNEL);
- if (!buf) {
- err = -ENOMEM;
- goto error;
- }
+ if (!buf)
+ return -ENOMEM;
}
if (next > buf->len) {
char *nbuf = kvzalloc(PAGE_ALIGN(next), GFP_KERNEL);
- if (!nbuf) {
- err = -ENOMEM;
- goto error;
- }
+ if (!nbuf)
+ return -ENOMEM;
kvfree(buf->buffer);
buf->buffer = nbuf;
buf->len = PAGE_ALIGN(next);
}
- if (copy_from_user(buf->buffer + pos, buffer, count)) {
- err = -EFAULT;
- goto error;
- }
+ if (copy_from_user(buf->buffer + pos, buffer, count))
+ return -EFAULT;
buf->size = next;
- error:
- mutex_unlock(&entry->access);
- if (err < 0)
- return err;
*offset = next;
return count;
}
@@ -369,10 +350,10 @@ static int snd_info_text_entry_open(struct inode *inode, struct file *file)
struct snd_info_private_data *data;
int err;
- mutex_lock(&info_mutex);
+ guard(mutex)(&info_mutex);
err = alloc_info_private(entry, &data);
if (err < 0)
- goto unlock;
+ return err;
data->rbuffer = kzalloc(sizeof(*data->rbuffer), GFP_KERNEL);
if (!data->rbuffer) {
@@ -386,15 +367,12 @@ static int snd_info_text_entry_open(struct inode *inode, struct file *file)
err = single_open(file, snd_info_seq_show, data);
if (err < 0)
goto error;
- mutex_unlock(&info_mutex);
return 0;
error:
kfree(data->rbuffer);
kfree(data);
module_put(entry->module);
- unlock:
- mutex_unlock(&info_mutex);
return err;
}
@@ -549,7 +527,7 @@ int snd_info_card_register(struct snd_card *card)
*/
void snd_info_card_id_change(struct snd_card *card)
{
- mutex_lock(&info_mutex);
+ guard(mutex)(&info_mutex);
if (card->proc_root_link) {
proc_remove(card->proc_root_link);
card->proc_root_link = NULL;
@@ -558,7 +536,6 @@ void snd_info_card_id_change(struct snd_card *card)
card->proc_root_link = proc_symlink(card->id,
snd_proc_root->p,
card->proc_root->name);
- mutex_unlock(&info_mutex);
}
/*
@@ -574,12 +551,11 @@ void snd_info_card_disconnect(struct snd_card *card)
if (card->proc_root)
proc_remove(card->proc_root->p);
- mutex_lock(&info_mutex);
+ guard(mutex)(&info_mutex);
if (card->proc_root)
snd_info_clear_entries(card->proc_root);
card->proc_root_link = NULL;
card->proc_root = NULL;
- mutex_unlock(&info_mutex);
}
/*
@@ -703,9 +679,8 @@ snd_info_create_entry(const char *name, struct snd_info_entry *parent,
entry->parent = parent;
entry->module = module;
if (parent) {
- mutex_lock(&parent->access);
+ guard(mutex)(&parent->access);
list_add_tail(&entry->list, &parent->children);
- mutex_unlock(&parent->access);
}
return entry;
}
@@ -775,9 +750,8 @@ void snd_info_free_entry(struct snd_info_entry * entry)
return;
if (entry->p) {
proc_remove(entry->p);
- mutex_lock(&info_mutex);
+ guard(mutex)(&info_mutex);
snd_info_clear_entries(entry);
- mutex_unlock(&info_mutex);
}
/* free all children at first */
@@ -786,9 +760,8 @@ void snd_info_free_entry(struct snd_info_entry * entry)
p = entry->parent;
if (p) {
- mutex_lock(&p->access);
+ guard(mutex)(&p->access);
list_del(&entry->list);
- mutex_unlock(&p->access);
}
kfree(entry->name);
if (entry->private_free)
@@ -804,15 +777,13 @@ static int __snd_info_register(struct snd_info_entry *entry)
if (snd_BUG_ON(!entry))
return -ENXIO;
root = entry->parent == NULL ? snd_proc_root->p : entry->parent->p;
- mutex_lock(&info_mutex);
+ guard(mutex)(&info_mutex);
if (entry->p || !root)
- goto unlock;
+ return 0;
if (S_ISDIR(entry->mode)) {
p = proc_mkdir_mode(entry->name, entry->mode, root);
- if (!p) {
- mutex_unlock(&info_mutex);
+ if (!p)
return -ENOMEM;
- }
} else {
const struct proc_ops *ops;
if (entry->content == SNDRV_INFO_CONTENT_DATA)
@@ -821,15 +792,11 @@ static int __snd_info_register(struct snd_info_entry *entry)
ops = &snd_info_text_entry_ops;
p = proc_create_data(entry->name, entry->mode, root,
ops, entry);
- if (!p) {
- mutex_unlock(&info_mutex);
+ if (!p)
return -ENOMEM;
- }
proc_set_size(p, entry->size);
}
entry->p = p;
- unlock:
- mutex_unlock(&info_mutex);
return 0;
}
diff --git a/sound/core/info_oss.c b/sound/core/info_oss.c
index ebc714b2f46b..0dbbb8005570 100644
--- a/sound/core/info_oss.c
+++ b/sound/core/info_oss.c
@@ -29,20 +29,17 @@ int snd_oss_info_register(int dev, int num, char *string)
return -ENXIO;
if (snd_BUG_ON(num < 0 || num >= SNDRV_CARDS))
return -ENXIO;
- mutex_lock(&strings);
+ guard(mutex)(&strings);
if (string == NULL) {
x = snd_sndstat_strings[num][dev];
kfree(x);
x = NULL;
} else {
x = kstrdup(string, GFP_KERNEL);
- if (x == NULL) {
- mutex_unlock(&strings);
+ if (x == NULL)
return -ENOMEM;
- }
}
snd_sndstat_strings[num][dev] = x;
- mutex_unlock(&strings);
return 0;
}
EXPORT_SYMBOL(snd_oss_info_register);
@@ -53,7 +50,7 @@ static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int d
char *str;
snd_iprintf(buf, "\n%s:", id);
- mutex_lock(&strings);
+ guard(mutex)(&strings);
for (idx = 0; idx < SNDRV_CARDS; idx++) {
str = snd_sndstat_strings[idx][dev];
if (str) {
@@ -64,7 +61,6 @@ static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int d
snd_iprintf(buf, "%i: %s\n", idx, str);
}
}
- mutex_unlock(&strings);
if (ok < 0)
snd_iprintf(buf, " NOT ENABLED IN CONFIG\n");
return ok;
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 07/24] ALSA: mixer_oss: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (5 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 06/24] ALSA: info: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 08/24] ALSA: control: " Takashi Iwai
` (16 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/oss/mixer_oss.c | 153 +++++++++++++++----------------------
1 file changed, 60 insertions(+), 93 deletions(-)
diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
index e10017a42ed8..24f90ef8decc 100644
--- a/sound/core/oss/mixer_oss.c
+++ b/sound/core/oss/mixer_oss.c
@@ -130,13 +130,12 @@ static int snd_mixer_oss_devmask(struct snd_mixer_oss_file *fmixer)
if (mixer == NULL)
return -EIO;
- mutex_lock(&mixer->reg_mutex);
+ guard(mutex)(&mixer->reg_mutex);
for (chn = 0; chn < 31; chn++) {
pslot = &mixer->slots[chn];
if (pslot->put_volume || pslot->put_recsrc)
result |= 1 << chn;
}
- mutex_unlock(&mixer->reg_mutex);
return result;
}
@@ -148,13 +147,12 @@ static int snd_mixer_oss_stereodevs(struct snd_mixer_oss_file *fmixer)
if (mixer == NULL)
return -EIO;
- mutex_lock(&mixer->reg_mutex);
+ guard(mutex)(&mixer->reg_mutex);
for (chn = 0; chn < 31; chn++) {
pslot = &mixer->slots[chn];
if (pslot->put_volume && pslot->stereo)
result |= 1 << chn;
}
- mutex_unlock(&mixer->reg_mutex);
return result;
}
@@ -165,7 +163,7 @@ static int snd_mixer_oss_recmask(struct snd_mixer_oss_file *fmixer)
if (mixer == NULL)
return -EIO;
- mutex_lock(&mixer->reg_mutex);
+ guard(mutex)(&mixer->reg_mutex);
if (mixer->put_recsrc && mixer->get_recsrc) { /* exclusive */
result = mixer->mask_recsrc;
} else {
@@ -177,7 +175,6 @@ static int snd_mixer_oss_recmask(struct snd_mixer_oss_file *fmixer)
result |= 1 << chn;
}
}
- mutex_unlock(&mixer->reg_mutex);
return result;
}
@@ -188,12 +185,12 @@ static int snd_mixer_oss_get_recsrc(struct snd_mixer_oss_file *fmixer)
if (mixer == NULL)
return -EIO;
- mutex_lock(&mixer->reg_mutex);
+ guard(mutex)(&mixer->reg_mutex);
if (mixer->put_recsrc && mixer->get_recsrc) { /* exclusive */
unsigned int index;
result = mixer->get_recsrc(fmixer, &index);
if (result < 0)
- goto unlock;
+ return result;
result = 1 << index;
} else {
struct snd_mixer_oss_slot *pslot;
@@ -209,8 +206,6 @@ static int snd_mixer_oss_get_recsrc(struct snd_mixer_oss_file *fmixer)
}
}
mixer->oss_recsrc = result;
- unlock:
- mutex_unlock(&mixer->reg_mutex);
return result;
}
@@ -224,7 +219,7 @@ static int snd_mixer_oss_set_recsrc(struct snd_mixer_oss_file *fmixer, int recsr
if (mixer == NULL)
return -EIO;
- mutex_lock(&mixer->reg_mutex);
+ guard(mutex)(&mixer->reg_mutex);
if (mixer->get_recsrc && mixer->put_recsrc) { /* exclusive input */
if (recsrc & ~mixer->oss_recsrc)
recsrc &= ~mixer->oss_recsrc;
@@ -250,7 +245,6 @@ static int snd_mixer_oss_set_recsrc(struct snd_mixer_oss_file *fmixer, int recsr
}
}
}
- mutex_unlock(&mixer->reg_mutex);
return result;
}
@@ -262,7 +256,7 @@ static int snd_mixer_oss_get_volume(struct snd_mixer_oss_file *fmixer, int slot)
if (mixer == NULL || slot > 30)
return -EIO;
- mutex_lock(&mixer->reg_mutex);
+ guard(mutex)(&mixer->reg_mutex);
pslot = &mixer->slots[slot];
left = pslot->volume[0];
right = pslot->volume[1];
@@ -270,21 +264,15 @@ static int snd_mixer_oss_get_volume(struct snd_mixer_oss_file *fmixer, int slot)
result = pslot->get_volume(fmixer, pslot, &left, &right);
if (!pslot->stereo)
right = left;
- if (snd_BUG_ON(left < 0 || left > 100)) {
- result = -EIO;
- goto unlock;
- }
- if (snd_BUG_ON(right < 0 || right > 100)) {
- result = -EIO;
- goto unlock;
- }
+ if (snd_BUG_ON(left < 0 || left > 100))
+ return -EIO;
+ if (snd_BUG_ON(right < 0 || right > 100))
+ return -EIO;
if (result >= 0) {
pslot->volume[0] = left;
pslot->volume[1] = right;
result = (left & 0xff) | ((right & 0xff) << 8);
}
- unlock:
- mutex_unlock(&mixer->reg_mutex);
return result;
}
@@ -297,7 +285,7 @@ static int snd_mixer_oss_set_volume(struct snd_mixer_oss_file *fmixer,
if (mixer == NULL || slot > 30)
return -EIO;
- mutex_lock(&mixer->reg_mutex);
+ guard(mutex)(&mixer->reg_mutex);
pslot = &mixer->slots[slot];
if (left > 100)
left = 100;
@@ -308,12 +296,10 @@ static int snd_mixer_oss_set_volume(struct snd_mixer_oss_file *fmixer,
if (pslot->put_volume)
result = pslot->put_volume(fmixer, pslot, left, right);
if (result < 0)
- goto unlock;
+ return result;
pslot->volume[0] = left;
pslot->volume[1] = right;
result = (left & 0xff) | ((right & 0xff) << 8);
- unlock:
- mutex_unlock(&mixer->reg_mutex);
return result;
}
@@ -822,18 +808,16 @@ static int snd_mixer_oss_get_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned
uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
if (uinfo == NULL || uctl == NULL)
return -ENOMEM;
- down_read(&card->controls_rwsem);
+ guard(rwsem_read)(&card->controls_rwsem);
kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0);
- if (! kctl) {
- err = -ENOENT;
- goto __unlock;
- }
+ if (!kctl)
+ return -ENOENT;
err = kctl->info(kctl, uinfo);
if (err < 0)
- goto __unlock;
+ return err;
err = kctl->get(kctl, uctl);
if (err < 0)
- goto __unlock;
+ return err;
for (idx = 0; idx < 32; idx++) {
if (!(mixer->mask_recsrc & (1 << idx)))
continue;
@@ -848,10 +832,7 @@ static int snd_mixer_oss_get_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned
break;
}
}
- err = 0;
- __unlock:
- up_read(&card->controls_rwsem);
- return err;
+ return 0;
}
static int snd_mixer_oss_put_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned int active_index)
@@ -870,15 +851,13 @@ static int snd_mixer_oss_put_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned
uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
if (uinfo == NULL || uctl == NULL)
return -ENOMEM;
- down_read(&card->controls_rwsem);
+ guard(rwsem_read)(&card->controls_rwsem);
kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0);
- if (! kctl) {
- err = -ENOENT;
- goto __unlock;
- }
+ if (!kctl)
+ return -ENOENT;
err = kctl->info(kctl, uinfo);
if (err < 0)
- goto __unlock;
+ return err;
for (idx = 0; idx < 32; idx++) {
if (!(mixer->mask_recsrc & (1 << idx)))
continue;
@@ -892,17 +871,14 @@ static int snd_mixer_oss_put_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned
break;
slot = NULL;
}
- if (! slot)
- goto __unlock;
+ if (!slot)
+ return 0;
for (idx = 0; idx < uinfo->count; idx++)
uctl->value.enumerated.item[idx] = slot->capture_item;
err = kctl->put(kctl, uctl);
if (err > 0)
snd_ctl_notify(fmixer->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
- err = 0;
- __unlock:
- up_read(&card->controls_rwsem);
- return err;
+ return 0;
}
struct snd_mixer_oss_assign_table {
@@ -918,24 +894,18 @@ static int snd_mixer_oss_build_test(struct snd_mixer_oss *mixer, struct slot *sl
struct snd_card *card = mixer->card;
int err;
- down_read(&card->controls_rwsem);
- kcontrol = snd_mixer_oss_test_id(mixer, name, index);
- if (kcontrol == NULL) {
- up_read(&card->controls_rwsem);
- return 0;
+ scoped_guard(rwsem_read, &card->controls_rwsem) {
+ kcontrol = snd_mixer_oss_test_id(mixer, name, index);
+ if (kcontrol == NULL)
+ return 0;
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ err = kcontrol->info(kcontrol, info);
+ if (err < 0)
+ return err;
+ slot->numid[item] = kcontrol->id.numid;
}
- info = kmalloc(sizeof(*info), GFP_KERNEL);
- if (! info) {
- up_read(&card->controls_rwsem);
- return -ENOMEM;
- }
- err = kcontrol->info(kcontrol, info);
- if (err < 0) {
- up_read(&card->controls_rwsem);
- return err;
- }
- slot->numid[item] = kcontrol->id.numid;
- up_read(&card->controls_rwsem);
if (info->count > slot->channels)
slot->channels = info->count;
slot->present |= 1 << item;
@@ -1160,7 +1130,7 @@ static void snd_mixer_oss_proc_read(struct snd_info_entry *entry,
struct snd_mixer_oss *mixer = entry->private_data;
int i;
- mutex_lock(&mixer->reg_mutex);
+ guard(mutex)(&mixer->reg_mutex);
for (i = 0; i < SNDRV_OSS_MAX_MIXERS; i++) {
struct slot *p;
@@ -1175,7 +1145,6 @@ static void snd_mixer_oss_proc_read(struct snd_info_entry *entry,
else
snd_iprintf(buffer, "\"\" 0\n");
}
- mutex_unlock(&mixer->reg_mutex);
}
static void snd_mixer_oss_proc_write(struct snd_info_entry *entry,
@@ -1202,9 +1171,8 @@ static void snd_mixer_oss_proc_write(struct snd_info_entry *entry,
cptr = snd_info_get_str(str, cptr, sizeof(str));
if (! *str) {
/* remove the entry */
- mutex_lock(&mixer->reg_mutex);
- mixer_slot_clear(&mixer->slots[ch]);
- mutex_unlock(&mixer->reg_mutex);
+ scoped_guard(mutex, &mixer->reg_mutex)
+ mixer_slot_clear(&mixer->slots[ch]);
continue;
}
snd_info_get_str(idxstr, cptr, sizeof(idxstr));
@@ -1213,28 +1181,27 @@ static void snd_mixer_oss_proc_write(struct snd_info_entry *entry,
pr_err("ALSA: mixer_oss: invalid index %d\n", idx);
continue;
}
- mutex_lock(&mixer->reg_mutex);
- slot = (struct slot *)mixer->slots[ch].private_data;
- if (slot && slot->assigned &&
- slot->assigned->index == idx && ! strcmp(slot->assigned->name, str))
- /* not changed */
- goto __unlock;
- tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
- if (!tbl)
- goto __unlock;
- tbl->oss_id = ch;
- tbl->name = kstrdup(str, GFP_KERNEL);
- if (! tbl->name) {
- kfree(tbl);
- goto __unlock;
+ scoped_guard(mutex, &mixer->reg_mutex) {
+ slot = (struct slot *)mixer->slots[ch].private_data;
+ if (slot && slot->assigned &&
+ slot->assigned->index == idx && !strcmp(slot->assigned->name, str))
+ /* not changed */
+ break;
+ tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
+ if (!tbl)
+ break;
+ tbl->oss_id = ch;
+ tbl->name = kstrdup(str, GFP_KERNEL);
+ if (!tbl->name) {
+ kfree(tbl);
+ break;
+ }
+ tbl->index = idx;
+ if (snd_mixer_oss_build_input(mixer, tbl, 1, 1) <= 0) {
+ kfree(tbl->name);
+ kfree(tbl);
+ }
}
- tbl->index = idx;
- if (snd_mixer_oss_build_input(mixer, tbl, 1, 1) <= 0) {
- kfree(tbl->name);
- kfree(tbl);
- }
- __unlock:
- mutex_unlock(&mixer->reg_mutex);
}
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 08/24] ALSA: control: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (6 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 07/24] ALSA: mixer_oss: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 09/24] ALSA: rawmidi: " Takashi Iwai
` (15 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
The lops calls under multiple rwsems are factored out as a simple
macro, so that it can be called easily from snd_ctl_dev_register()
and snd_ctl_dev_disconnect().
There are a few remaining explicit rwsem and spinlock calls, and those
are the places where the lock downgrade happens or where the temporary
unlock/relocking happens -- which guard() doens't cover well yet.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/control.c | 429 +++++++++++++++++--------------------------
1 file changed, 171 insertions(+), 258 deletions(-)
diff --git a/sound/core/control.c b/sound/core/control.c
index c8cd70aed6af..d45428dbdfb0 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -44,7 +44,6 @@ static int snd_ctl_remove_locked(struct snd_card *card,
static int snd_ctl_open(struct inode *inode, struct file *file)
{
- unsigned long flags;
struct snd_card *card;
struct snd_ctl_file *ctl;
int i, err;
@@ -80,9 +79,8 @@ static int snd_ctl_open(struct inode *inode, struct file *file)
ctl->preferred_subdevice[i] = -1;
ctl->pid = get_pid(task_pid(current));
file->private_data = ctl;
- write_lock_irqsave(&card->ctl_files_rwlock, flags);
- list_add_tail(&ctl->list, &card->ctl_files);
- write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
+ scoped_guard(write_lock_irqsave, &card->ctl_files_rwlock)
+ list_add_tail(&ctl->list, &card->ctl_files);
snd_card_unref(card);
return 0;
@@ -98,21 +96,18 @@ static int snd_ctl_open(struct inode *inode, struct file *file)
static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
{
- unsigned long flags;
struct snd_kctl_event *cread;
- spin_lock_irqsave(&ctl->read_lock, flags);
+ guard(spinlock_irqsave)(&ctl->read_lock);
while (!list_empty(&ctl->events)) {
cread = snd_kctl_event(ctl->events.next);
list_del(&cread->list);
kfree(cread);
}
- spin_unlock_irqrestore(&ctl->read_lock, flags);
}
static int snd_ctl_release(struct inode *inode, struct file *file)
{
- unsigned long flags;
struct snd_card *card;
struct snd_ctl_file *ctl;
struct snd_kcontrol *control;
@@ -121,15 +116,17 @@ static int snd_ctl_release(struct inode *inode, struct file *file)
ctl = file->private_data;
file->private_data = NULL;
card = ctl->card;
- write_lock_irqsave(&card->ctl_files_rwlock, flags);
- list_del(&ctl->list);
- write_unlock_irqrestore(&card->ctl_files_rwlock, flags);
- down_write(&card->controls_rwsem);
- list_for_each_entry(control, &card->controls, list)
- for (idx = 0; idx < control->count; idx++)
- if (control->vd[idx].owner == ctl)
- control->vd[idx].owner = NULL;
- up_write(&card->controls_rwsem);
+
+ scoped_guard(write_lock_irqsave, &card->ctl_files_rwlock)
+ list_del(&ctl->list);
+
+ scoped_guard(rwsem_write, &card->controls_rwsem) {
+ list_for_each_entry(control, &card->controls, list)
+ for (idx = 0; idx < control->count; idx++)
+ if (control->vd[idx].owner == ctl)
+ control->vd[idx].owner = NULL;
+ }
+
snd_fasync_free(ctl->fasync);
snd_ctl_empty_read_queue(ctl);
put_pid(ctl->pid);
@@ -152,7 +149,6 @@ static int snd_ctl_release(struct inode *inode, struct file *file)
void snd_ctl_notify(struct snd_card *card, unsigned int mask,
struct snd_ctl_elem_id *id)
{
- unsigned long flags;
struct snd_ctl_file *ctl;
struct snd_kctl_event *ev;
@@ -160,34 +156,34 @@ void snd_ctl_notify(struct snd_card *card, unsigned int mask,
return;
if (card->shutdown)
return;
- read_lock_irqsave(&card->ctl_files_rwlock, flags);
+
+ guard(read_lock_irqsave)(&card->ctl_files_rwlock);
#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
card->mixer_oss_change_count++;
#endif
list_for_each_entry(ctl, &card->ctl_files, list) {
if (!ctl->subscribed)
continue;
- spin_lock(&ctl->read_lock);
- list_for_each_entry(ev, &ctl->events, list) {
- if (ev->id.numid == id->numid) {
- ev->mask |= mask;
- goto _found;
+ scoped_guard(spinlock, &ctl->read_lock) {
+ list_for_each_entry(ev, &ctl->events, list) {
+ if (ev->id.numid == id->numid) {
+ ev->mask |= mask;
+ goto _found;
+ }
}
+ ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
+ if (ev) {
+ ev->id = *id;
+ ev->mask = mask;
+ list_add_tail(&ev->list, &ctl->events);
+ } else {
+ dev_err(card->dev, "No memory available to allocate event\n");
+ }
+_found:
+ wake_up(&ctl->change_sleep);
}
- ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
- if (ev) {
- ev->id = *id;
- ev->mask = mask;
- list_add_tail(&ev->list, &ctl->events);
- } else {
- dev_err(card->dev, "No memory available to allocate event\n");
- }
- _found:
- wake_up(&ctl->change_sleep);
- spin_unlock(&ctl->read_lock);
snd_kill_fasync(ctl->fasync, SIGIO, POLL_IN);
}
- read_unlock_irqrestore(&card->ctl_files_rwlock, flags);
}
EXPORT_SYMBOL(snd_ctl_notify);
@@ -210,10 +206,9 @@ void snd_ctl_notify_one(struct snd_card *card, unsigned int mask,
id.index += ioff;
id.numid += ioff;
snd_ctl_notify(card, mask, &id);
- down_read(&snd_ctl_layer_rwsem);
+ guard(rwsem_read)(&snd_ctl_layer_rwsem);
for (lops = snd_ctl_layer; lops; lops = lops->next)
lops->lnotify(card, mask, kctl, ioff);
- up_read(&snd_ctl_layer_rwsem);
}
EXPORT_SYMBOL(snd_ctl_notify_one);
@@ -520,9 +515,9 @@ static int snd_ctl_add_replace(struct snd_card *card,
if (snd_BUG_ON(!card || !kcontrol->info))
goto error;
- down_write(&card->controls_rwsem);
- err = __snd_ctl_add_replace(card, kcontrol, mode);
- up_write(&card->controls_rwsem);
+ scoped_guard(rwsem_write, &card->controls_rwsem)
+ err = __snd_ctl_add_replace(card, kcontrol, mode);
+
if (err < 0)
goto error;
return 0;
@@ -616,12 +611,8 @@ static inline int snd_ctl_remove_locked(struct snd_card *card,
*/
int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol)
{
- int ret;
-
- down_write(&card->controls_rwsem);
- ret = snd_ctl_remove_locked(card, kcontrol);
- up_write(&card->controls_rwsem);
- return ret;
+ guard(rwsem_write)(&card->controls_rwsem);
+ return snd_ctl_remove_locked(card, kcontrol);
}
EXPORT_SYMBOL(snd_ctl_remove);
@@ -638,17 +629,12 @@ EXPORT_SYMBOL(snd_ctl_remove);
int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id)
{
struct snd_kcontrol *kctl;
- int ret;
- down_write(&card->controls_rwsem);
+ guard(rwsem_write)(&card->controls_rwsem);
kctl = snd_ctl_find_id_locked(card, id);
- if (kctl == NULL) {
- up_write(&card->controls_rwsem);
+ if (kctl == NULL)
return -ENOENT;
- }
- ret = snd_ctl_remove_locked(card, kctl);
- up_write(&card->controls_rwsem);
- return ret;
+ return snd_ctl_remove_locked(card, kctl);
}
EXPORT_SYMBOL(snd_ctl_remove_id);
@@ -667,27 +653,18 @@ static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
{
struct snd_card *card = file->card;
struct snd_kcontrol *kctl;
- int idx, ret;
+ int idx;
- down_write(&card->controls_rwsem);
+ guard(rwsem_write)(&card->controls_rwsem);
kctl = snd_ctl_find_id_locked(card, id);
- if (kctl == NULL) {
- ret = -ENOENT;
- goto error;
- }
- if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
- ret = -EINVAL;
- goto error;
- }
+ if (kctl == NULL)
+ return -ENOENT;
+ if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER))
+ return -EINVAL;
for (idx = 0; idx < kctl->count; idx++)
- if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
- ret = -EBUSY;
- goto error;
- }
- ret = snd_ctl_remove_locked(card, kctl);
-error:
- up_write(&card->controls_rwsem);
- return ret;
+ if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file)
+ return -EBUSY;
+ return snd_ctl_remove_locked(card, kctl);
}
/**
@@ -764,18 +741,15 @@ int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id,
struct snd_kcontrol *kctl;
int saved_numid;
- down_write(&card->controls_rwsem);
+ guard(rwsem_write)(&card->controls_rwsem);
kctl = snd_ctl_find_id_locked(card, src_id);
- if (kctl == NULL) {
- up_write(&card->controls_rwsem);
+ if (kctl == NULL)
return -ENOENT;
- }
saved_numid = kctl->id.numid;
remove_hash_entries(card, kctl);
kctl->id = *dst_id;
kctl->id.numid = saved_numid;
add_hash_entries(card, kctl);
- up_write(&card->controls_rwsem);
return 0;
}
EXPORT_SYMBOL(snd_ctl_rename_id);
@@ -793,7 +767,7 @@ EXPORT_SYMBOL(snd_ctl_rename_id);
void snd_ctl_rename(struct snd_card *card, struct snd_kcontrol *kctl,
const char *name)
{
- down_write(&card->controls_rwsem);
+ guard(rwsem_write)(&card->controls_rwsem);
remove_hash_entries(card, kctl);
if (strscpy(kctl->id.name, name, sizeof(kctl->id.name)) < 0)
@@ -801,7 +775,6 @@ void snd_ctl_rename(struct snd_card *card, struct snd_kcontrol *kctl,
name, kctl->id.name);
add_hash_entries(card, kctl);
- up_write(&card->controls_rwsem);
}
EXPORT_SYMBOL(snd_ctl_rename);
@@ -859,12 +832,8 @@ EXPORT_SYMBOL(snd_ctl_find_numid_locked);
struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card,
unsigned int numid)
{
- struct snd_kcontrol *kctl;
-
- down_read(&card->controls_rwsem);
- kctl = snd_ctl_find_numid_locked(card, numid);
- up_read(&card->controls_rwsem);
- return kctl;
+ guard(rwsem_read)(&card->controls_rwsem);
+ return snd_ctl_find_numid_locked(card, numid);
}
EXPORT_SYMBOL(snd_ctl_find_numid);
@@ -920,12 +889,8 @@ EXPORT_SYMBOL(snd_ctl_find_id_locked);
struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card,
const struct snd_ctl_elem_id *id)
{
- struct snd_kcontrol *kctl;
-
- down_read(&card->controls_rwsem);
- kctl = snd_ctl_find_id_locked(card, id);
- up_read(&card->controls_rwsem);
- return kctl;
+ guard(rwsem_read)(&card->controls_rwsem);
+ return snd_ctl_find_id_locked(card, id);
}
EXPORT_SYMBOL(snd_ctl_find_id);
@@ -937,15 +902,15 @@ static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (! info)
return -ENOMEM;
- down_read(&snd_ioctl_rwsem);
- info->card = card->number;
- strscpy(info->id, card->id, sizeof(info->id));
- strscpy(info->driver, card->driver, sizeof(info->driver));
- strscpy(info->name, card->shortname, sizeof(info->name));
- strscpy(info->longname, card->longname, sizeof(info->longname));
- strscpy(info->mixername, card->mixername, sizeof(info->mixername));
- strscpy(info->components, card->components, sizeof(info->components));
- up_read(&snd_ioctl_rwsem);
+ scoped_guard(rwsem_read, &snd_ioctl_rwsem) {
+ info->card = card->number;
+ strscpy(info->id, card->id, sizeof(info->id));
+ strscpy(info->driver, card->driver, sizeof(info->driver));
+ strscpy(info->name, card->shortname, sizeof(info->name));
+ strscpy(info->longname, card->longname, sizeof(info->longname));
+ strscpy(info->mixername, card->mixername, sizeof(info->mixername));
+ strscpy(info->components, card->components, sizeof(info->components));
+ }
if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info)))
return -EFAULT;
return 0;
@@ -957,37 +922,31 @@ static int snd_ctl_elem_list(struct snd_card *card,
struct snd_kcontrol *kctl;
struct snd_ctl_elem_id id;
unsigned int offset, space, jidx;
- int err = 0;
offset = list->offset;
space = list->space;
- down_read(&card->controls_rwsem);
+ guard(rwsem_read)(&card->controls_rwsem);
list->count = card->controls_count;
list->used = 0;
- if (space > 0) {
- list_for_each_entry(kctl, &card->controls, list) {
- if (offset >= kctl->count) {
- offset -= kctl->count;
- continue;
- }
- for (jidx = offset; jidx < kctl->count; jidx++) {
- snd_ctl_build_ioff(&id, kctl, jidx);
- if (copy_to_user(list->pids + list->used, &id,
- sizeof(id))) {
- err = -EFAULT;
- goto out;
- }
- list->used++;
- if (!--space)
- goto out;
- }
- offset = 0;
+ if (!space)
+ return 0;
+ list_for_each_entry(kctl, &card->controls, list) {
+ if (offset >= kctl->count) {
+ offset -= kctl->count;
+ continue;
}
+ for (jidx = offset; jidx < kctl->count; jidx++) {
+ snd_ctl_build_ioff(&id, kctl, jidx);
+ if (copy_to_user(list->pids + list->used, &id, sizeof(id)))
+ return -EFAULT;
+ list->used++;
+ if (!--space)
+ return 0;
+ }
+ offset = 0;
}
- out:
- up_read(&card->controls_rwsem);
- return err;
+ return 0;
}
static int snd_ctl_elem_list_user(struct snd_card *card,
@@ -1235,16 +1194,12 @@ static int snd_ctl_elem_info(struct snd_ctl_file *ctl,
{
struct snd_card *card = ctl->card;
struct snd_kcontrol *kctl;
- int result;
- down_read(&card->controls_rwsem);
+ guard(rwsem_read)(&card->controls_rwsem);
kctl = snd_ctl_find_id_locked(card, &info->id);
- if (kctl == NULL)
- result = -ENOENT;
- else
- result = __snd_ctl_elem_info(card, kctl, info, ctl);
- up_read(&card->controls_rwsem);
- return result;
+ if (!kctl)
+ return -ENOENT;
+ return __snd_ctl_elem_info(card, kctl, info, ctl);
}
static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
@@ -1276,19 +1231,15 @@ static int snd_ctl_elem_read(struct snd_card *card,
const u32 pattern = 0xdeadbeef;
int ret;
- down_read(&card->controls_rwsem);
+ guard(rwsem_read)(&card->controls_rwsem);
kctl = snd_ctl_find_id_locked(card, &control->id);
- if (kctl == NULL) {
- ret = -ENOENT;
- goto unlock;
- }
+ if (!kctl)
+ return -ENOENT;
index_offset = snd_ctl_get_ioff(kctl, &control->id);
vd = &kctl->vd[index_offset];
- if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_READ) || kctl->get == NULL) {
- ret = -EPERM;
- goto unlock;
- }
+ if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_READ) || !kctl->get)
+ return -EPERM;
snd_ctl_build_ioff(&control->id, kctl, index_offset);
@@ -1298,7 +1249,7 @@ static int snd_ctl_elem_read(struct snd_card *card,
info.id = control->id;
ret = __snd_ctl_elem_info(card, kctl, &info, NULL);
if (ret < 0)
- goto unlock;
+ return ret;
#endif
if (!snd_ctl_skip_validation(&info))
@@ -1308,7 +1259,7 @@ static int snd_ctl_elem_read(struct snd_card *card,
ret = kctl->get(kctl, control);
snd_power_unref(card);
if (ret < 0)
- goto unlock;
+ return ret;
if (!snd_ctl_skip_validation(&info) &&
sanity_check_elem_value(card, control, &info, pattern) < 0) {
dev_err(card->dev,
@@ -1316,12 +1267,9 @@ static int snd_ctl_elem_read(struct snd_card *card,
control->id.iface, control->id.device,
control->id.subdevice, control->id.name,
control->id.index);
- ret = -EINVAL;
- goto unlock;
+ return -EINVAL;
}
-unlock:
- up_read(&card->controls_rwsem);
- return ret;
+ return 0;
}
static int snd_ctl_elem_read_user(struct snd_card *card,
@@ -1426,25 +1374,18 @@ static int snd_ctl_elem_lock(struct snd_ctl_file *file,
struct snd_ctl_elem_id id;
struct snd_kcontrol *kctl;
struct snd_kcontrol_volatile *vd;
- int result;
if (copy_from_user(&id, _id, sizeof(id)))
return -EFAULT;
- down_write(&card->controls_rwsem);
+ guard(rwsem_write)(&card->controls_rwsem);
kctl = snd_ctl_find_id_locked(card, &id);
- if (kctl == NULL) {
- result = -ENOENT;
- } else {
- vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
- if (vd->owner != NULL)
- result = -EBUSY;
- else {
- vd->owner = file;
- result = 0;
- }
- }
- up_write(&card->controls_rwsem);
- return result;
+ if (!kctl)
+ return -ENOENT;
+ vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
+ if (vd->owner)
+ return -EBUSY;
+ vd->owner = file;
+ return 0;
}
static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
@@ -1454,27 +1395,20 @@ static int snd_ctl_elem_unlock(struct snd_ctl_file *file,
struct snd_ctl_elem_id id;
struct snd_kcontrol *kctl;
struct snd_kcontrol_volatile *vd;
- int result;
if (copy_from_user(&id, _id, sizeof(id)))
return -EFAULT;
- down_write(&card->controls_rwsem);
+ guard(rwsem_write)(&card->controls_rwsem);
kctl = snd_ctl_find_id_locked(card, &id);
- if (kctl == NULL) {
- result = -ENOENT;
- } else {
- vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
- if (vd->owner == NULL)
- result = -EINVAL;
- else if (vd->owner != file)
- result = -EPERM;
- else {
- vd->owner = NULL;
- result = 0;
- }
- }
- up_write(&card->controls_rwsem);
- return result;
+ if (!kctl)
+ return -ENOENT;
+ vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)];
+ if (!vd->owner)
+ return -EINVAL;
+ if (vd->owner != file)
+ return -EPERM;
+ vd->owner = NULL;
+ return 0;
}
struct user_element {
@@ -1756,11 +1690,9 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
private_size = value_sizes[info->type] * info->count;
alloc_size = compute_user_elem_size(private_size, count);
- down_write(&card->controls_rwsem);
- if (check_user_elem_overflow(card, alloc_size)) {
- err = -ENOMEM;
- goto unlock;
- }
+ guard(rwsem_write)(&card->controls_rwsem);
+ if (check_user_elem_overflow(card, alloc_size))
+ return -ENOMEM;
/*
* Keep memory object for this userspace control. After passing this
@@ -1770,13 +1702,12 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
*/
err = snd_ctl_new(&kctl, count, access, file);
if (err < 0)
- goto unlock;
+ return err;
memcpy(&kctl->id, &info->id, sizeof(kctl->id));
ue = kzalloc(alloc_size, GFP_KERNEL);
if (!ue) {
kfree(kctl);
- err = -ENOMEM;
- goto unlock;
+ return -ENOMEM;
}
kctl->private_data = ue;
kctl->private_free = snd_ctl_elem_user_free;
@@ -1794,7 +1725,7 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
err = snd_ctl_elem_init_enum_names(ue);
if (err < 0) {
snd_ctl_free_one(kctl);
- goto unlock;
+ return err;
}
}
@@ -1814,7 +1745,7 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
err = __snd_ctl_add_replace(card, kctl, CTL_ADD_EXCLUSIVE);
if (err < 0) {
snd_ctl_free_one(kctl);
- goto unlock;
+ return err;
}
offset = snd_ctl_get_ioff(kctl, &info->id);
snd_ctl_build_ioff(&info->id, kctl, offset);
@@ -1825,9 +1756,7 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
* applications because the field originally means PID of a process
* which locks the element.
*/
- unlock:
- up_write(&card->controls_rwsem);
- return err;
+ return 0;
}
static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
@@ -2029,34 +1958,31 @@ static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg
case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
return snd_ctl_subscribe_events(ctl, ip);
case SNDRV_CTL_IOCTL_TLV_READ:
- down_read(&ctl->card->controls_rwsem);
- err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ);
+ scoped_guard(rwsem_read, &ctl->card->controls_rwsem)
+ err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ);
up_read(&ctl->card->controls_rwsem);
return err;
case SNDRV_CTL_IOCTL_TLV_WRITE:
- down_write(&ctl->card->controls_rwsem);
- err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE);
+ scoped_guard(rwsem_write, &ctl->card->controls_rwsem)
+ err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE);
up_write(&ctl->card->controls_rwsem);
return err;
case SNDRV_CTL_IOCTL_TLV_COMMAND:
- down_write(&ctl->card->controls_rwsem);
- err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD);
- up_write(&ctl->card->controls_rwsem);
+ scoped_guard(rwsem_write, &ctl->card->controls_rwsem)
+ err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD);
return err;
case SNDRV_CTL_IOCTL_POWER:
return -ENOPROTOOPT;
case SNDRV_CTL_IOCTL_POWER_STATE:
return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0;
}
- down_read(&snd_ioctl_rwsem);
+
+ guard(rwsem_read)(&snd_ioctl_rwsem);
list_for_each_entry(p, &snd_control_ioctls, list) {
err = p->fioctl(card, ctl, cmd, arg);
- if (err != -ENOIOCTLCMD) {
- up_read(&snd_ioctl_rwsem);
+ if (err != -ENOIOCTLCMD)
return err;
- }
}
- up_read(&snd_ioctl_rwsem);
dev_dbg(card->dev, "unknown ioctl = 0x%x\n", cmd);
return -ENOTTY;
}
@@ -2148,9 +2074,8 @@ static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *
if (pn == NULL)
return -ENOMEM;
pn->fioctl = fcn;
- down_write(&snd_ioctl_rwsem);
+ guard(rwsem_write)(&snd_ioctl_rwsem);
list_add_tail(&pn->list, lists);
- up_write(&snd_ioctl_rwsem);
return 0;
}
@@ -2193,16 +2118,14 @@ static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn,
if (snd_BUG_ON(!fcn))
return -EINVAL;
- down_write(&snd_ioctl_rwsem);
+ guard(rwsem_write)(&snd_ioctl_rwsem);
list_for_each_entry(p, lists, list) {
if (p->fioctl == fcn) {
list_del(&p->list);
- up_write(&snd_ioctl_rwsem);
kfree(p);
return 0;
}
}
- up_write(&snd_ioctl_rwsem);
snd_BUG();
return -EINVAL;
}
@@ -2249,9 +2172,8 @@ int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type)
{
struct snd_ctl_file *kctl;
int subdevice = -1;
- unsigned long flags;
- read_lock_irqsave(&card->ctl_files_rwlock, flags);
+ guard(read_lock_irqsave)(&card->ctl_files_rwlock);
list_for_each_entry(kctl, &card->ctl_files, list) {
if (kctl->pid == task_pid(current)) {
subdevice = kctl->preferred_subdevice[type];
@@ -2259,7 +2181,6 @@ int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type)
break;
}
}
- read_unlock_irqrestore(&card->ctl_files_rwlock, flags);
return subdevice;
}
EXPORT_SYMBOL_GPL(snd_ctl_get_preferred_subdevice);
@@ -2289,13 +2210,11 @@ int snd_ctl_request_layer(const char *module_name)
if (module_name == NULL)
return 0;
- down_read(&snd_ctl_layer_rwsem);
- for (lops = snd_ctl_layer; lops; lops = lops->next)
- if (strcmp(lops->module_name, module_name) == 0)
- break;
- up_read(&snd_ctl_layer_rwsem);
- if (lops)
- return 0;
+ scoped_guard(rwsem_read, &snd_ctl_layer_rwsem) {
+ for (lops = snd_ctl_layer; lops; lops = lops->next)
+ if (strcmp(lops->module_name, module_name) == 0)
+ return 0;
+ }
return request_module(module_name);
}
EXPORT_SYMBOL_GPL(snd_ctl_request_layer);
@@ -2312,16 +2231,15 @@ void snd_ctl_register_layer(struct snd_ctl_layer_ops *lops)
struct snd_card *card;
int card_number;
- down_write(&snd_ctl_layer_rwsem);
- lops->next = snd_ctl_layer;
- snd_ctl_layer = lops;
- up_write(&snd_ctl_layer_rwsem);
+ scoped_guard(rwsem_write, &snd_ctl_layer_rwsem) {
+ lops->next = snd_ctl_layer;
+ snd_ctl_layer = lops;
+ }
for (card_number = 0; card_number < SNDRV_CARDS; card_number++) {
card = snd_card_ref(card_number);
if (card) {
- down_read(&card->controls_rwsem);
- lops->lregister(card);
- up_read(&card->controls_rwsem);
+ scoped_guard(rwsem_read, &card->controls_rwsem)
+ lops->lregister(card);
snd_card_unref(card);
}
}
@@ -2340,7 +2258,7 @@ void snd_ctl_disconnect_layer(struct snd_ctl_layer_ops *lops)
{
struct snd_ctl_layer_ops *lops2, *prev_lops2;
- down_write(&snd_ctl_layer_rwsem);
+ guard(rwsem_write)(&snd_ctl_layer_rwsem);
for (lops2 = snd_ctl_layer, prev_lops2 = NULL; lops2; lops2 = lops2->next) {
if (lops2 == lops) {
if (!prev_lops2)
@@ -2351,7 +2269,6 @@ void snd_ctl_disconnect_layer(struct snd_ctl_layer_ops *lops)
}
prev_lops2 = lops2;
}
- up_write(&snd_ctl_layer_rwsem);
}
EXPORT_SYMBOL_GPL(snd_ctl_disconnect_layer);
@@ -2372,25 +2289,29 @@ static const struct file_operations snd_ctl_f_ops =
.fasync = snd_ctl_fasync,
};
+/* call lops under rwsems; called from snd_ctl_dev_*() below() */
+#define call_snd_ctl_lops(_card, _op) \
+ do { \
+ struct snd_ctl_layer_ops *lops; \
+ guard(rwsem_read)(&(_card)->controls_rwsem); \
+ guard(rwsem_read)(&snd_ctl_layer_rwsem); \
+ for (lops = snd_ctl_layer; lops; lops = lops->next) \
+ lops->_op(_card); \
+ } while (0)
+
/*
* registration of the control device
*/
static int snd_ctl_dev_register(struct snd_device *device)
{
struct snd_card *card = device->device_data;
- struct snd_ctl_layer_ops *lops;
int err;
err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
&snd_ctl_f_ops, card, card->ctl_dev);
if (err < 0)
return err;
- down_read(&card->controls_rwsem);
- down_read(&snd_ctl_layer_rwsem);
- for (lops = snd_ctl_layer; lops; lops = lops->next)
- lops->lregister(card);
- up_read(&snd_ctl_layer_rwsem);
- up_read(&card->controls_rwsem);
+ call_snd_ctl_lops(card, lregister);
return 0;
}
@@ -2401,23 +2322,15 @@ static int snd_ctl_dev_disconnect(struct snd_device *device)
{
struct snd_card *card = device->device_data;
struct snd_ctl_file *ctl;
- struct snd_ctl_layer_ops *lops;
- unsigned long flags;
- read_lock_irqsave(&card->ctl_files_rwlock, flags);
- list_for_each_entry(ctl, &card->ctl_files, list) {
- wake_up(&ctl->change_sleep);
- snd_kill_fasync(ctl->fasync, SIGIO, POLL_ERR);
+ scoped_guard(read_lock_irqsave, &card->ctl_files_rwlock) {
+ list_for_each_entry(ctl, &card->ctl_files, list) {
+ wake_up(&ctl->change_sleep);
+ snd_kill_fasync(ctl->fasync, SIGIO, POLL_ERR);
+ }
}
- read_unlock_irqrestore(&card->ctl_files_rwlock, flags);
-
- down_read(&card->controls_rwsem);
- down_read(&snd_ctl_layer_rwsem);
- for (lops = snd_ctl_layer; lops; lops = lops->next)
- lops->ldisconnect(card);
- up_read(&snd_ctl_layer_rwsem);
- up_read(&card->controls_rwsem);
+ call_snd_ctl_lops(card, ldisconnect);
return snd_unregister_device(card->ctl_dev);
}
@@ -2429,17 +2342,17 @@ static int snd_ctl_dev_free(struct snd_device *device)
struct snd_card *card = device->device_data;
struct snd_kcontrol *control;
- down_write(&card->controls_rwsem);
- while (!list_empty(&card->controls)) {
- control = snd_kcontrol(card->controls.next);
- __snd_ctl_remove(card, control, false);
- }
+ scoped_guard(rwsem_write, &card->controls_rwsem) {
+ while (!list_empty(&card->controls)) {
+ control = snd_kcontrol(card->controls.next);
+ __snd_ctl_remove(card, control, false);
+ }
#ifdef CONFIG_SND_CTL_FAST_LOOKUP
- xa_destroy(&card->ctl_numids);
- xa_destroy(&card->ctl_hash);
+ xa_destroy(&card->ctl_numids);
+ xa_destroy(&card->ctl_hash);
#endif
- up_write(&card->controls_rwsem);
+ }
put_device(card->ctl_dev);
return 0;
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 09/24] ALSA: rawmidi: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (7 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 08/24] ALSA: control: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 10/24] ALSA: jack: " Takashi Iwai
` (14 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
There are a few remaining explicit mutex and spinlock calls, and those
are the places where the temporary unlock/relocking happens -- which
guard() doens't cover well yet.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/rawmidi.c | 232 +++++++++++++++----------------------------
1 file changed, 82 insertions(+), 150 deletions(-)
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 1431cb997808..0e20ab3a4d75 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -105,13 +105,8 @@ static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
{
- unsigned long flags;
- bool ready;
-
- spin_lock_irqsave(&substream->lock, flags);
- ready = __snd_rawmidi_ready(substream->runtime);
- spin_unlock_irqrestore(&substream->lock, flags);
- return ready;
+ guard(spinlock_irqsave)(&substream->lock);
+ return __snd_rawmidi_ready(substream->runtime);
}
static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
@@ -238,12 +233,9 @@ static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
bool is_input)
{
- unsigned long flags;
-
- spin_lock_irqsave(&substream->lock, flags);
+ guard(spinlock_irqsave)(&substream->lock);
if (substream->opened && substream->runtime)
__reset_runtime_ptrs(substream->runtime, is_input);
- spin_unlock_irqrestore(&substream->lock, flags);
}
int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
@@ -260,33 +252,29 @@ int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
long timeout;
struct snd_rawmidi_runtime *runtime;
- spin_lock_irq(&substream->lock);
- runtime = substream->runtime;
- if (!substream->opened || !runtime || !runtime->buffer) {
- err = -EINVAL;
- } else {
+ scoped_guard(spinlock_irq, &substream->lock) {
+ runtime = substream->runtime;
+ if (!substream->opened || !runtime || !runtime->buffer)
+ return -EINVAL;
snd_rawmidi_buffer_ref(runtime);
runtime->drain = 1;
}
- spin_unlock_irq(&substream->lock);
- if (err < 0)
- return err;
timeout = wait_event_interruptible_timeout(runtime->sleep,
(runtime->avail >= runtime->buffer_size),
10*HZ);
- spin_lock_irq(&substream->lock);
- if (signal_pending(current))
- err = -ERESTARTSYS;
- if (runtime->avail < runtime->buffer_size && !timeout) {
- rmidi_warn(substream->rmidi,
- "rawmidi drain error (avail = %li, buffer_size = %li)\n",
- (long)runtime->avail, (long)runtime->buffer_size);
- err = -EIO;
+ scoped_guard(spinlock_irq, &substream->lock) {
+ if (signal_pending(current))
+ err = -ERESTARTSYS;
+ if (runtime->avail < runtime->buffer_size && !timeout) {
+ rmidi_warn(substream->rmidi,
+ "rawmidi drain error (avail = %li, buffer_size = %li)\n",
+ (long)runtime->avail, (long)runtime->buffer_size);
+ err = -EIO;
+ }
+ runtime->drain = 0;
}
- runtime->drain = 0;
- spin_unlock_irq(&substream->lock);
if (err != -ERESTARTSYS) {
/* we need wait a while to make sure that Tx FIFOs are empty */
@@ -297,9 +285,8 @@ int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
snd_rawmidi_drop_output(substream);
}
- spin_lock_irq(&substream->lock);
- snd_rawmidi_buffer_unref(runtime);
- spin_unlock_irq(&substream->lock);
+ scoped_guard(spinlock_irq, &substream->lock)
+ snd_rawmidi_buffer_unref(runtime);
return err;
}
@@ -363,14 +350,13 @@ static int open_substream(struct snd_rawmidi *rmidi,
snd_rawmidi_runtime_free(substream);
return err;
}
- spin_lock_irq(&substream->lock);
+ guard(spinlock_irq)(&substream->lock);
substream->opened = 1;
substream->active_sensing = 0;
if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
substream->append = 1;
substream->pid = get_pid(task_pid(current));
rmidi->streams[substream->stream].substream_opened++;
- spin_unlock_irq(&substream->lock);
}
substream->use_count++;
return 0;
@@ -433,9 +419,8 @@ int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice,
if (!try_module_get(rmidi->card->module))
return -ENXIO;
- mutex_lock(&rmidi->open_mutex);
+ guard(mutex)(&rmidi->open_mutex);
err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
- mutex_unlock(&rmidi->open_mutex);
if (err < 0)
module_put(rmidi->card->module);
return err;
@@ -568,10 +553,10 @@ static void close_substream(struct snd_rawmidi *rmidi,
}
snd_rawmidi_buffer_ref_sync(substream);
}
- spin_lock_irq(&substream->lock);
- substream->opened = 0;
- substream->append = 0;
- spin_unlock_irq(&substream->lock);
+ scoped_guard(spinlock_irq, &substream->lock) {
+ substream->opened = 0;
+ substream->append = 0;
+ }
substream->ops->close(substream);
if (substream->runtime->private_free)
substream->runtime->private_free(substream);
@@ -586,7 +571,7 @@ static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
struct snd_rawmidi *rmidi;
rmidi = rfile->rmidi;
- mutex_lock(&rmidi->open_mutex);
+ guard(mutex)(&rmidi->open_mutex);
if (rfile->input) {
close_substream(rmidi, rfile->input, 1);
rfile->input = NULL;
@@ -596,7 +581,6 @@ static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
rfile->output = NULL;
}
rfile->rmidi = NULL;
- mutex_unlock(&rmidi->open_mutex);
wake_up(&rmidi->open_wait);
}
@@ -695,12 +679,8 @@ static int __snd_rawmidi_info_select(struct snd_card *card,
int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
{
- int ret;
-
- mutex_lock(®ister_mutex);
- ret = __snd_rawmidi_info_select(card, info);
- mutex_unlock(®ister_mutex);
- return ret;
+ guard(mutex)(®ister_mutex);
+ return __snd_rawmidi_info_select(card, info);
}
EXPORT_SYMBOL(snd_rawmidi_info_select);
@@ -744,9 +724,8 @@ static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
if (!newbuf)
return -ENOMEM;
- spin_lock_irq(&substream->lock);
+ guard(spinlock_irq)(&substream->lock);
if (runtime->buffer_ref) {
- spin_unlock_irq(&substream->lock);
kvfree(newbuf);
return -EBUSY;
}
@@ -754,7 +733,6 @@ static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
runtime->buffer = newbuf;
runtime->buffer_size = params->buffer_size;
__reset_runtime_ptrs(runtime, is_input);
- spin_unlock_irq(&substream->lock);
kvfree(oldbuf);
}
runtime->avail_min = params->avail_min;
@@ -767,15 +745,12 @@ int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
int err;
snd_rawmidi_drain_output(substream);
- mutex_lock(&substream->rmidi->open_mutex);
+ guard(mutex)(&substream->rmidi->open_mutex);
if (substream->append && substream->use_count > 1)
- err = -EBUSY;
- else
- err = resize_runtime_buffer(substream, params, false);
-
+ return -EBUSY;
+ err = resize_runtime_buffer(substream, params, false);
if (!err)
substream->active_sensing = !params->no_active_sensing;
- mutex_unlock(&substream->rmidi->open_mutex);
return err;
}
EXPORT_SYMBOL(snd_rawmidi_output_params);
@@ -788,7 +763,7 @@ int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
int err;
snd_rawmidi_drain_input(substream);
- mutex_lock(&substream->rmidi->open_mutex);
+ guard(mutex)(&substream->rmidi->open_mutex);
if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
err = -EINVAL;
else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
@@ -802,7 +777,6 @@ int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
substream->framing = framing;
substream->clock_type = clock_type;
}
- mutex_unlock(&substream->rmidi->open_mutex);
return 0;
}
EXPORT_SYMBOL(snd_rawmidi_input_params);
@@ -814,9 +788,8 @@ static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
memset(status, 0, sizeof(*status));
status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
- spin_lock_irq(&substream->lock);
+ guard(spinlock_irq)(&substream->lock);
status->avail = runtime->avail;
- spin_unlock_irq(&substream->lock);
return 0;
}
@@ -827,11 +800,10 @@ static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
memset(status, 0, sizeof(*status));
status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
- spin_lock_irq(&substream->lock);
+ guard(spinlock_irq)(&substream->lock);
status->avail = runtime->avail;
status->xruns = runtime->xruns;
runtime->xruns = 0;
- spin_unlock_irq(&substream->lock);
return 0;
}
@@ -1025,7 +997,7 @@ static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
return -EFAULT;
if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
device = SNDRV_RAWMIDI_DEVICES - 1;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
device = device < 0 ? 0 : device + 1;
for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
rmidi = snd_rawmidi_search(card, device);
@@ -1037,7 +1009,6 @@ static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
}
if (device == SNDRV_RAWMIDI_DEVICES)
device = -1;
- mutex_unlock(®ister_mutex);
if (put_user(device, argp))
return -EFAULT;
return 0;
@@ -1050,18 +1021,16 @@ static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,
{
struct snd_ump_endpoint_info __user *info = argp;
struct snd_rawmidi *rmidi;
- int device, ret;
+ int device;
if (get_user(device, &info->device))
return -EFAULT;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
rmidi = snd_rawmidi_search(card, device);
if (rmidi && rmidi->ops && rmidi->ops->ioctl)
- ret = rmidi->ops->ioctl(rmidi, cmd, argp);
+ return rmidi->ops->ioctl(rmidi, cmd, argp);
else
- ret = -ENXIO;
- mutex_unlock(®ister_mutex);
- return ret;
+ return -ENXIO;
}
#endif
@@ -1168,27 +1137,23 @@ static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substr
int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
const unsigned char *buffer, int count)
{
- unsigned long flags;
struct timespec64 ts64 = get_framing_tstamp(substream);
int result = 0, count1;
struct snd_rawmidi_runtime *runtime;
- spin_lock_irqsave(&substream->lock, flags);
- if (!substream->opened) {
- result = -EBADFD;
- goto unlock;
- }
+ guard(spinlock_irqsave)(&substream->lock);
+ if (!substream->opened)
+ return -EBADFD;
runtime = substream->runtime;
if (!runtime || !runtime->buffer) {
rmidi_dbg(substream->rmidi,
"snd_rawmidi_receive: input is not active!!!\n");
- result = -EINVAL;
- goto unlock;
+ return -EINVAL;
}
count = get_aligned_size(runtime, count);
if (!count)
- goto unlock;
+ return result;
if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
@@ -1211,7 +1176,7 @@ int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
count1 = runtime->buffer_size - runtime->avail;
count1 = get_aligned_size(runtime, count1);
if (!count1)
- goto unlock;
+ return result;
memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
runtime->hw_ptr += count1;
runtime->hw_ptr %= runtime->buffer_size;
@@ -1239,8 +1204,6 @@ int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
else if (__snd_rawmidi_ready(runtime))
wake_up(&runtime->sleep);
}
- unlock:
- spin_unlock_irqrestore(&substream->lock, flags);
return result;
}
EXPORT_SYMBOL(snd_rawmidi_receive);
@@ -1362,20 +1325,15 @@ static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t coun
int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
{
struct snd_rawmidi_runtime *runtime;
- int result;
- unsigned long flags;
- spin_lock_irqsave(&substream->lock, flags);
+ guard(spinlock_irqsave)(&substream->lock);
runtime = substream->runtime;
if (!substream->opened || !runtime || !runtime->buffer) {
rmidi_dbg(substream->rmidi,
"snd_rawmidi_transmit_empty: output is not active!!!\n");
- result = 1;
- } else {
- result = runtime->avail >= runtime->buffer_size;
+ return 1;
}
- spin_unlock_irqrestore(&substream->lock, flags);
- return result;
+ return (runtime->avail >= runtime->buffer_size);
}
EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
@@ -1449,16 +1407,10 @@ static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
unsigned char *buffer, int count)
{
- int result;
- unsigned long flags;
-
- spin_lock_irqsave(&substream->lock, flags);
+ guard(spinlock_irqsave)(&substream->lock);
if (!substream->opened || !substream->runtime)
- result = -EBADFD;
- else
- result = __snd_rawmidi_transmit_peek(substream, buffer, count);
- spin_unlock_irqrestore(&substream->lock, flags);
- return result;
+ return -EBADFD;
+ return __snd_rawmidi_transmit_peek(substream, buffer, count);
}
EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
@@ -1505,16 +1457,10 @@ static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
*/
int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
{
- int result;
- unsigned long flags;
-
- spin_lock_irqsave(&substream->lock, flags);
+ guard(spinlock_irqsave)(&substream->lock);
if (!substream->opened || !substream->runtime)
- result = -EBADFD;
- else
- result = __snd_rawmidi_transmit_ack(substream, count);
- spin_unlock_irqrestore(&substream->lock, flags);
- return result;
+ return -EBADFD;
+ return __snd_rawmidi_transmit_ack(substream, count);
}
EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
@@ -1531,21 +1477,13 @@ EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
unsigned char *buffer, int count)
{
- int result;
- unsigned long flags;
-
- spin_lock_irqsave(&substream->lock, flags);
+ guard(spinlock_irqsave)(&substream->lock);
if (!substream->opened)
- result = -EBADFD;
- else {
- count = __snd_rawmidi_transmit_peek(substream, buffer, count);
- if (count <= 0)
- result = count;
- else
- result = __snd_rawmidi_transmit_ack(substream, count);
- }
- spin_unlock_irqrestore(&substream->lock, flags);
- return result;
+ return -EBADFD;
+ count = __snd_rawmidi_transmit_peek(substream, buffer, count);
+ if (count <= 0)
+ return count;
+ return __snd_rawmidi_transmit_ack(substream, count);
}
EXPORT_SYMBOL(snd_rawmidi_transmit);
@@ -1558,17 +1496,15 @@ EXPORT_SYMBOL(snd_rawmidi_transmit);
int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
{
struct snd_rawmidi_runtime *runtime;
- unsigned long flags;
int count = 0;
- spin_lock_irqsave(&substream->lock, flags);
+ guard(spinlock_irqsave)(&substream->lock);
runtime = substream->runtime;
if (substream->opened && runtime &&
runtime->avail < runtime->buffer_size) {
count = runtime->buffer_size - runtime->avail;
__snd_rawmidi_transmit_ack(substream, count);
}
- spin_unlock_irqrestore(&substream->lock, flags);
return count;
}
EXPORT_SYMBOL(snd_rawmidi_proceed);
@@ -1772,7 +1708,7 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
rawmidi_is_ump(rmidi) ? "UMP" : "Legacy");
if (rmidi->ops && rmidi->ops->proc_read)
rmidi->ops->proc_read(entry, buffer);
- mutex_lock(&rmidi->open_mutex);
+ guard(mutex)(&rmidi->open_mutex);
if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
list_for_each_entry(substream,
&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
@@ -1787,10 +1723,10 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
" Owner PID : %d\n",
pid_vnr(substream->pid));
runtime = substream->runtime;
- spin_lock_irq(&substream->lock);
- buffer_size = runtime->buffer_size;
- avail = runtime->avail;
- spin_unlock_irq(&substream->lock);
+ scoped_guard(spinlock_irq, &substream->lock) {
+ buffer_size = runtime->buffer_size;
+ avail = runtime->avail;
+ }
snd_iprintf(buffer,
" Mode : %s\n"
" Buffer size : %lu\n"
@@ -1814,11 +1750,11 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
" Owner PID : %d\n",
pid_vnr(substream->pid));
runtime = substream->runtime;
- spin_lock_irq(&substream->lock);
- buffer_size = runtime->buffer_size;
- avail = runtime->avail;
- xruns = runtime->xruns;
- spin_unlock_irq(&substream->lock);
+ scoped_guard(spinlock_irq, &substream->lock) {
+ buffer_size = runtime->buffer_size;
+ avail = runtime->avail;
+ xruns = runtime->xruns;
+ }
snd_iprintf(buffer,
" Buffer size : %lu\n"
" Avail : %lu\n"
@@ -1835,7 +1771,6 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
}
}
}
- mutex_unlock(&rmidi->open_mutex);
}
/*
@@ -2024,12 +1959,12 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
return -ENOMEM;
err = 0;
- mutex_lock(®ister_mutex);
- if (snd_rawmidi_search(rmidi->card, rmidi->device))
- err = -EBUSY;
- else
- list_add_tail(&rmidi->list, &snd_rawmidi_devices);
- mutex_unlock(®ister_mutex);
+ scoped_guard(mutex, ®ister_mutex) {
+ if (snd_rawmidi_search(rmidi->card, rmidi->device))
+ err = -EBUSY;
+ else
+ list_add_tail(&rmidi->list, &snd_rawmidi_devices);
+ }
if (err < 0)
return err;
@@ -2102,9 +2037,8 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
error_unregister:
snd_unregister_device(rmidi->dev);
error:
- mutex_lock(®ister_mutex);
- list_del(&rmidi->list);
- mutex_unlock(®ister_mutex);
+ scoped_guard(mutex, ®ister_mutex)
+ list_del(&rmidi->list);
return err;
}
@@ -2113,8 +2047,8 @@ static int snd_rawmidi_dev_disconnect(struct snd_device *device)
struct snd_rawmidi *rmidi = device->device_data;
int dir;
- mutex_lock(®ister_mutex);
- mutex_lock(&rmidi->open_mutex);
+ guard(mutex)(®ister_mutex);
+ guard(mutex)(&rmidi->open_mutex);
wake_up(&rmidi->open_wait);
list_del_init(&rmidi->list);
for (dir = 0; dir < 2; dir++) {
@@ -2140,8 +2074,6 @@ static int snd_rawmidi_dev_disconnect(struct snd_device *device)
}
#endif /* CONFIG_SND_OSSEMUL */
snd_unregister_device(rmidi->dev);
- mutex_unlock(&rmidi->open_mutex);
- mutex_unlock(®ister_mutex);
return 0;
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 10/24] ALSA: jack: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (8 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 09/24] ALSA: rawmidi: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 11/24] ALSA: core: " Takashi Iwai
` (13 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/jack.c | 25 +++++++------------------
1 file changed, 7 insertions(+), 18 deletions(-)
diff --git a/sound/core/jack.c b/sound/core/jack.c
index e0f034e7275c..e08b2c4fbd1a 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -42,11 +42,9 @@ static int snd_jack_dev_disconnect(struct snd_device *device)
#ifdef CONFIG_SND_JACK_INPUT_DEV
struct snd_jack *jack = device->device_data;
- mutex_lock(&jack->input_dev_lock);
- if (!jack->input_dev) {
- mutex_unlock(&jack->input_dev_lock);
+ guard(mutex)(&jack->input_dev_lock);
+ if (!jack->input_dev)
return 0;
- }
/* If the input device is registered with the input subsystem
* then we need to use a different deallocator. */
@@ -55,7 +53,6 @@ static int snd_jack_dev_disconnect(struct snd_device *device)
else
input_free_device(jack->input_dev);
jack->input_dev = NULL;
- mutex_unlock(&jack->input_dev_lock);
#endif /* CONFIG_SND_JACK_INPUT_DEV */
return 0;
}
@@ -92,11 +89,9 @@ static int snd_jack_dev_register(struct snd_device *device)
snprintf(jack->name, sizeof(jack->name), "%s %s",
card->shortname, jack->id);
- mutex_lock(&jack->input_dev_lock);
- if (!jack->input_dev) {
- mutex_unlock(&jack->input_dev_lock);
+ guard(mutex)(&jack->input_dev_lock);
+ if (!jack->input_dev)
return 0;
- }
jack->input_dev->name = jack->name;
@@ -121,7 +116,6 @@ static int snd_jack_dev_register(struct snd_device *device)
if (err == 0)
jack->registered = 1;
- mutex_unlock(&jack->input_dev_lock);
return err;
}
#endif /* CONFIG_SND_JACK_INPUT_DEV */
@@ -586,14 +580,9 @@ EXPORT_SYMBOL(snd_jack_new);
void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
{
WARN_ON(jack->registered);
- mutex_lock(&jack->input_dev_lock);
- if (!jack->input_dev) {
- mutex_unlock(&jack->input_dev_lock);
- return;
- }
-
- jack->input_dev->dev.parent = parent;
- mutex_unlock(&jack->input_dev_lock);
+ guard(mutex)(&jack->input_dev_lock);
+ if (jack->input_dev)
+ jack->input_dev->dev.parent = parent;
}
EXPORT_SYMBOL(snd_jack_set_parent);
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 11/24] ALSA: core: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (9 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 10/24] ALSA: jack: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 12/24] ALSA: seq: fifo: " Takashi Iwai
` (12 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/init.c | 199 +++++++++++++++++++----------------------
sound/core/sound.c | 28 +++---
sound/core/sound_oss.c | 17 ++--
3 files changed, 107 insertions(+), 137 deletions(-)
diff --git a/sound/core/init.c b/sound/core/init.c
index 22c0d217b860..4ed5037d8693 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -284,30 +284,31 @@ static int snd_card_init(struct snd_card *card, struct device *parent,
if (xid)
strscpy(card->id, xid, sizeof(card->id));
err = 0;
- mutex_lock(&snd_card_mutex);
- if (idx < 0) /* first check the matching module-name slot */
- idx = get_slot_from_bitmask(idx, module_slot_match, module);
- if (idx < 0) /* if not matched, assign an empty slot */
- idx = get_slot_from_bitmask(idx, check_empty_slot, module);
- if (idx < 0)
- err = -ENODEV;
- else if (idx < snd_ecards_limit) {
- if (test_bit(idx, snd_cards_lock))
- err = -EBUSY; /* invalid */
- } else if (idx >= SNDRV_CARDS)
- err = -ENODEV;
+ scoped_guard(mutex, &snd_card_mutex) {
+ if (idx < 0) /* first check the matching module-name slot */
+ idx = get_slot_from_bitmask(idx, module_slot_match, module);
+ if (idx < 0) /* if not matched, assign an empty slot */
+ idx = get_slot_from_bitmask(idx, check_empty_slot, module);
+ if (idx < 0)
+ err = -ENODEV;
+ else if (idx < snd_ecards_limit) {
+ if (test_bit(idx, snd_cards_lock))
+ err = -EBUSY; /* invalid */
+ } else if (idx >= SNDRV_CARDS)
+ err = -ENODEV;
+ if (!err) {
+ set_bit(idx, snd_cards_lock); /* lock it */
+ if (idx >= snd_ecards_limit)
+ snd_ecards_limit = idx + 1; /* increase the limit */
+ }
+ }
if (err < 0) {
- mutex_unlock(&snd_card_mutex);
dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n",
- idx, snd_ecards_limit - 1, err);
+ idx, snd_ecards_limit - 1, err);
if (!card->managed)
kfree(card); /* manually free here, as no destructor called */
return err;
}
- set_bit(idx, snd_cards_lock); /* lock it */
- if (idx >= snd_ecards_limit)
- snd_ecards_limit = idx + 1; /* increase the limit */
- mutex_unlock(&snd_card_mutex);
card->dev = parent;
card->number = idx;
#ifdef MODULE
@@ -386,11 +387,10 @@ struct snd_card *snd_card_ref(int idx)
{
struct snd_card *card;
- mutex_lock(&snd_card_mutex);
+ guard(mutex)(&snd_card_mutex);
card = snd_cards[idx];
if (card)
get_device(&card->card_dev);
- mutex_unlock(&snd_card_mutex);
return card;
}
EXPORT_SYMBOL_GPL(snd_card_ref);
@@ -398,12 +398,8 @@ EXPORT_SYMBOL_GPL(snd_card_ref);
/* return non-zero if a card is already locked */
int snd_card_locked(int card)
{
- int locked;
-
- mutex_lock(&snd_card_mutex);
- locked = test_bit(card, snd_cards_lock);
- mutex_unlock(&snd_card_mutex);
- return locked;
+ guard(mutex)(&snd_card_mutex);
+ return test_bit(card, snd_cards_lock);
}
static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
@@ -427,15 +423,15 @@ static int snd_disconnect_release(struct inode *inode, struct file *file)
{
struct snd_monitor_file *df = NULL, *_df;
- spin_lock(&shutdown_lock);
- list_for_each_entry(_df, &shutdown_files, shutdown_list) {
- if (_df->file == file) {
- df = _df;
- list_del_init(&df->shutdown_list);
- break;
+ scoped_guard(spinlock, &shutdown_lock) {
+ list_for_each_entry(_df, &shutdown_files, shutdown_list) {
+ if (_df->file == file) {
+ df = _df;
+ list_del_init(&df->shutdown_list);
+ break;
+ }
}
}
- spin_unlock(&shutdown_lock);
if (likely(df)) {
if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
@@ -501,27 +497,24 @@ void snd_card_disconnect(struct snd_card *card)
if (!card)
return;
- spin_lock(&card->files_lock);
- if (card->shutdown) {
- spin_unlock(&card->files_lock);
- return;
+ scoped_guard(spinlock, &card->files_lock) {
+ if (card->shutdown)
+ return;
+ card->shutdown = 1;
+
+ /* replace file->f_op with special dummy operations */
+ list_for_each_entry(mfile, &card->files_list, list) {
+ /* it's critical part, use endless loop */
+ /* we have no room to fail */
+ mfile->disconnected_f_op = mfile->file->f_op;
+
+ scoped_guard(spinlock, &shutdown_lock)
+ list_add(&mfile->shutdown_list, &shutdown_files);
+
+ mfile->file->f_op = &snd_shutdown_f_ops;
+ fops_get(mfile->file->f_op);
+ }
}
- card->shutdown = 1;
-
- /* replace file->f_op with special dummy operations */
- list_for_each_entry(mfile, &card->files_list, list) {
- /* it's critical part, use endless loop */
- /* we have no room to fail */
- mfile->disconnected_f_op = mfile->file->f_op;
-
- spin_lock(&shutdown_lock);
- list_add(&mfile->shutdown_list, &shutdown_files);
- spin_unlock(&shutdown_lock);
-
- mfile->file->f_op = &snd_shutdown_f_ops;
- fops_get(mfile->file->f_op);
- }
- spin_unlock(&card->files_lock);
/* notify all connected devices about disconnection */
/* at this point, they cannot respond to any calls except release() */
@@ -544,10 +537,10 @@ void snd_card_disconnect(struct snd_card *card)
}
/* disable fops (user space) operations for ALSA API */
- mutex_lock(&snd_card_mutex);
- snd_cards[card->number] = NULL;
- clear_bit(card->number, snd_cards_lock);
- mutex_unlock(&snd_card_mutex);
+ scoped_guard(mutex, &snd_card_mutex) {
+ snd_cards[card->number] = NULL;
+ clear_bit(card->number, snd_cards_lock);
+ }
#ifdef CONFIG_PM
wake_up(&card->power_sleep);
@@ -569,11 +562,10 @@ void snd_card_disconnect_sync(struct snd_card *card)
{
snd_card_disconnect(card);
- spin_lock_irq(&card->files_lock);
+ guard(spinlock_irq)(&card->files_lock);
wait_event_lock_irq(card->remove_sleep,
list_empty(&card->files_list),
card->files_lock);
- spin_unlock_irq(&card->files_lock);
}
EXPORT_SYMBOL_GPL(snd_card_disconnect_sync);
@@ -767,9 +759,8 @@ void snd_card_set_id(struct snd_card *card, const char *nid)
/* check if user specified own card->id */
if (card->id[0] != '\0')
return;
- mutex_lock(&snd_card_mutex);
+ guard(mutex)(&snd_card_mutex);
snd_card_set_id_no_lock(card, nid, nid);
- mutex_unlock(&snd_card_mutex);
}
EXPORT_SYMBOL(snd_card_set_id);
@@ -797,14 +788,11 @@ static ssize_t id_store(struct device *dev, struct device_attribute *attr,
}
memcpy(buf1, buf, copy);
buf1[copy] = '\0';
- mutex_lock(&snd_card_mutex);
- if (!card_id_ok(NULL, buf1)) {
- mutex_unlock(&snd_card_mutex);
+ guard(mutex)(&snd_card_mutex);
+ if (!card_id_ok(NULL, buf1))
return -EEXIST;
- }
strcpy(card->id, buf1);
snd_info_card_id_change(card);
- mutex_unlock(&snd_card_mutex);
return count;
}
@@ -897,26 +885,27 @@ int snd_card_register(struct snd_card *card)
err = snd_device_register_all(card);
if (err < 0)
return err;
- mutex_lock(&snd_card_mutex);
- if (snd_cards[card->number]) {
- /* already registered */
- mutex_unlock(&snd_card_mutex);
- return snd_info_card_register(card); /* register pending info */
+ scoped_guard(mutex, &snd_card_mutex) {
+ if (snd_cards[card->number]) {
+ /* already registered */
+ return snd_info_card_register(card); /* register pending info */
+ }
+ if (*card->id) {
+ /* make a unique id name from the given string */
+ char tmpid[sizeof(card->id)];
+
+ memcpy(tmpid, card->id, sizeof(card->id));
+ snd_card_set_id_no_lock(card, tmpid, tmpid);
+ } else {
+ /* create an id from either shortname or longname */
+ const char *src;
+
+ src = *card->shortname ? card->shortname : card->longname;
+ snd_card_set_id_no_lock(card, src,
+ retrieve_id_from_card_name(src));
+ }
+ snd_cards[card->number] = card;
}
- if (*card->id) {
- /* make a unique id name from the given string */
- char tmpid[sizeof(card->id)];
- memcpy(tmpid, card->id, sizeof(card->id));
- snd_card_set_id_no_lock(card, tmpid, tmpid);
- } else {
- /* create an id from either shortname or longname */
- const char *src;
- src = *card->shortname ? card->shortname : card->longname;
- snd_card_set_id_no_lock(card, src,
- retrieve_id_from_card_name(src));
- }
- snd_cards[card->number] = card;
- mutex_unlock(&snd_card_mutex);
err = snd_info_card_register(card);
if (err < 0)
return err;
@@ -937,7 +926,7 @@ static void snd_card_info_read(struct snd_info_entry *entry,
struct snd_card *card;
for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
- mutex_lock(&snd_card_mutex);
+ guard(mutex)(&snd_card_mutex);
card = snd_cards[idx];
if (card) {
count++;
@@ -949,7 +938,6 @@ static void snd_card_info_read(struct snd_info_entry *entry,
snd_iprintf(buffer, " %s\n",
card->longname);
}
- mutex_unlock(&snd_card_mutex);
}
if (!count)
snd_iprintf(buffer, "--- no soundcards ---\n");
@@ -962,13 +950,12 @@ void snd_card_info_read_oss(struct snd_info_buffer *buffer)
struct snd_card *card;
for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
- mutex_lock(&snd_card_mutex);
+ guard(mutex)(&snd_card_mutex);
card = snd_cards[idx];
if (card) {
count++;
snd_iprintf(buffer, "%s\n", card->longname);
}
- mutex_unlock(&snd_card_mutex);
}
if (!count) {
snd_iprintf(buffer, "--- no soundcards ---\n");
@@ -985,12 +972,11 @@ static void snd_card_module_info_read(struct snd_info_entry *entry,
struct snd_card *card;
for (idx = 0; idx < SNDRV_CARDS; idx++) {
- mutex_lock(&snd_card_mutex);
+ guard(mutex)(&snd_card_mutex);
card = snd_cards[idx];
if (card)
snd_iprintf(buffer, "%2i %s\n",
idx, card->module->name);
- mutex_unlock(&snd_card_mutex);
}
}
#endif
@@ -1072,15 +1058,13 @@ int snd_card_file_add(struct snd_card *card, struct file *file)
mfile->file = file;
mfile->disconnected_f_op = NULL;
INIT_LIST_HEAD(&mfile->shutdown_list);
- spin_lock(&card->files_lock);
+ guard(spinlock)(&card->files_lock);
if (card->shutdown) {
- spin_unlock(&card->files_lock);
kfree(mfile);
return -ENODEV;
}
list_add(&mfile->list, &card->files_list);
get_device(&card->card_dev);
- spin_unlock(&card->files_lock);
return 0;
}
EXPORT_SYMBOL(snd_card_file_add);
@@ -1102,22 +1086,21 @@ int snd_card_file_remove(struct snd_card *card, struct file *file)
{
struct snd_monitor_file *mfile, *found = NULL;
- spin_lock(&card->files_lock);
- list_for_each_entry(mfile, &card->files_list, list) {
- if (mfile->file == file) {
- list_del(&mfile->list);
- spin_lock(&shutdown_lock);
- list_del(&mfile->shutdown_list);
- spin_unlock(&shutdown_lock);
- if (mfile->disconnected_f_op)
- fops_put(mfile->disconnected_f_op);
- found = mfile;
- break;
+ scoped_guard(spinlock, &card->files_lock) {
+ list_for_each_entry(mfile, &card->files_list, list) {
+ if (mfile->file == file) {
+ list_del(&mfile->list);
+ scoped_guard(spinlock, &shutdown_lock)
+ list_del(&mfile->shutdown_list);
+ if (mfile->disconnected_f_op)
+ fops_put(mfile->disconnected_f_op);
+ found = mfile;
+ break;
+ }
}
+ if (list_empty(&card->files_list))
+ wake_up_all(&card->remove_sleep);
}
- if (list_empty(&card->files_list))
- wake_up_all(&card->remove_sleep);
- spin_unlock(&card->files_lock);
if (!found) {
dev_err(card->dev, "card file remove problem (%p)\n", file);
return -ENOENT;
diff --git a/sound/core/sound.c b/sound/core/sound.c
index df5571d98629..b9db9aa0bfcb 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -103,7 +103,7 @@ void *snd_lookup_minor_data(unsigned int minor, int type)
if (minor >= ARRAY_SIZE(snd_minors))
return NULL;
- mutex_lock(&sound_mutex);
+ guard(mutex)(&sound_mutex);
mreg = snd_minors[minor];
if (mreg && mreg->type == type) {
private_data = mreg->private_data;
@@ -111,7 +111,6 @@ void *snd_lookup_minor_data(unsigned int minor, int type)
get_device(&mreg->card_ptr->card_dev);
} else
private_data = NULL;
- mutex_unlock(&sound_mutex);
return private_data;
}
EXPORT_SYMBOL(snd_lookup_minor_data);
@@ -150,17 +149,15 @@ static int snd_open(struct inode *inode, struct file *file)
if (minor >= ARRAY_SIZE(snd_minors))
return -ENODEV;
- mutex_lock(&sound_mutex);
- mptr = snd_minors[minor];
- if (mptr == NULL) {
- mptr = autoload_device(minor);
- if (!mptr) {
- mutex_unlock(&sound_mutex);
- return -ENODEV;
+ scoped_guard(mutex, &sound_mutex) {
+ mptr = snd_minors[minor];
+ if (mptr == NULL) {
+ mptr = autoload_device(minor);
+ if (!mptr)
+ return -ENODEV;
}
+ new_fops = fops_get(mptr->f_ops);
}
- new_fops = fops_get(mptr->f_ops);
- mutex_unlock(&sound_mutex);
if (!new_fops)
return -ENODEV;
replace_fops(file, new_fops);
@@ -269,7 +266,7 @@ int snd_register_device(int type, struct snd_card *card, int dev,
preg->f_ops = f_ops;
preg->private_data = private_data;
preg->card_ptr = card;
- mutex_lock(&sound_mutex);
+ guard(mutex)(&sound_mutex);
minor = snd_find_free_minor(type, card, dev);
if (minor < 0) {
err = minor;
@@ -284,7 +281,6 @@ int snd_register_device(int type, struct snd_card *card, int dev,
snd_minors[minor] = preg;
error:
- mutex_unlock(&sound_mutex);
if (err < 0)
kfree(preg);
return err;
@@ -305,7 +301,7 @@ int snd_unregister_device(struct device *dev)
int minor;
struct snd_minor *preg;
- mutex_lock(&sound_mutex);
+ guard(mutex)(&sound_mutex);
for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
preg = snd_minors[minor];
if (preg && preg->dev == dev) {
@@ -315,7 +311,6 @@ int snd_unregister_device(struct device *dev)
break;
}
}
- mutex_unlock(&sound_mutex);
if (minor >= ARRAY_SIZE(snd_minors))
return -ENOENT;
return 0;
@@ -355,7 +350,7 @@ static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_bu
int minor;
struct snd_minor *mptr;
- mutex_lock(&sound_mutex);
+ guard(mutex)(&sound_mutex);
for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
mptr = snd_minors[minor];
if (!mptr)
@@ -373,7 +368,6 @@ static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_bu
snd_iprintf(buffer, "%3i: : %s\n", minor,
snd_device_type_name(mptr->type));
}
- mutex_unlock(&sound_mutex);
}
int __init snd_minor_info_init(void)
diff --git a/sound/core/sound_oss.c b/sound/core/sound_oss.c
index 2751bf2ff61b..d65cc6fee2e6 100644
--- a/sound/core/sound_oss.c
+++ b/sound/core/sound_oss.c
@@ -29,7 +29,7 @@ void *snd_lookup_oss_minor_data(unsigned int minor, int type)
if (minor >= ARRAY_SIZE(snd_oss_minors))
return NULL;
- mutex_lock(&sound_oss_mutex);
+ guard(mutex)(&sound_oss_mutex);
mreg = snd_oss_minors[minor];
if (mreg && mreg->type == type) {
private_data = mreg->private_data;
@@ -37,7 +37,6 @@ void *snd_lookup_oss_minor_data(unsigned int minor, int type)
get_device(&mreg->card_ptr->card_dev);
} else
private_data = NULL;
- mutex_unlock(&sound_oss_mutex);
return private_data;
}
EXPORT_SYMBOL(snd_lookup_oss_minor_data);
@@ -106,7 +105,7 @@ int snd_register_oss_device(int type, struct snd_card *card, int dev,
preg->f_ops = f_ops;
preg->private_data = private_data;
preg->card_ptr = card;
- mutex_lock(&sound_oss_mutex);
+ guard(mutex)(&sound_oss_mutex);
snd_oss_minors[minor] = preg;
minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
switch (minor_unit) {
@@ -130,7 +129,6 @@ int snd_register_oss_device(int type, struct snd_card *card, int dev,
goto __end;
snd_oss_minors[track2] = preg;
}
- mutex_unlock(&sound_oss_mutex);
return 0;
__end:
@@ -139,7 +137,6 @@ int snd_register_oss_device(int type, struct snd_card *card, int dev,
if (register1 >= 0)
unregister_sound_special(register1);
snd_oss_minors[minor] = NULL;
- mutex_unlock(&sound_oss_mutex);
kfree(preg);
return -EBUSY;
}
@@ -156,12 +153,10 @@ int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
return 0;
if (minor < 0)
return minor;
- mutex_lock(&sound_oss_mutex);
+ guard(mutex)(&sound_oss_mutex);
mptr = snd_oss_minors[minor];
- if (mptr == NULL) {
- mutex_unlock(&sound_oss_mutex);
+ if (mptr == NULL)
return -ENOENT;
- }
switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
case SNDRV_MINOR_OSS_PCM:
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
@@ -176,7 +171,6 @@ int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
if (track2 >= 0)
snd_oss_minors[track2] = NULL;
snd_oss_minors[minor] = NULL;
- mutex_unlock(&sound_oss_mutex);
/* call unregister_sound_special() outside sound_oss_mutex;
* otherwise may deadlock, as it can trigger the release of a card
@@ -220,7 +214,7 @@ static void snd_minor_info_oss_read(struct snd_info_entry *entry,
int minor;
struct snd_minor *mptr;
- mutex_lock(&sound_oss_mutex);
+ guard(mutex)(&sound_oss_mutex);
for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
mptr = snd_oss_minors[minor];
if (!mptr)
@@ -233,7 +227,6 @@ static void snd_minor_info_oss_read(struct snd_info_entry *entry,
snd_iprintf(buffer, "%3i: : %s\n", minor,
snd_oss_device_type_name(mptr->type));
}
- mutex_unlock(&sound_oss_mutex);
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 12/24] ALSA: seq: fifo: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (10 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 11/24] ALSA: core: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:27 ` [PATCH 13/24] ALSA: seq: memory: " Takashi Iwai
` (11 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/seq/seq_fifo.c | 55 +++++++++++++++++----------------------
1 file changed, 24 insertions(+), 31 deletions(-)
diff --git a/sound/core/seq/seq_fifo.c b/sound/core/seq/seq_fifo.c
index f8e02e98709a..3a10b081f129 100644
--- a/sound/core/seq/seq_fifo.c
+++ b/sound/core/seq/seq_fifo.c
@@ -88,12 +88,11 @@ void snd_seq_fifo_clear(struct snd_seq_fifo *f)
atomic_set(&f->overflow, 0);
snd_use_lock_sync(&f->use_lock);
- spin_lock_irq(&f->lock);
+ guard(spinlock_irq)(&f->lock);
/* drain the fifo */
while ((cell = fifo_cell_out(f)) != NULL) {
snd_seq_cell_free(cell);
}
- spin_unlock_irq(&f->lock);
}
@@ -102,7 +101,6 @@ int snd_seq_fifo_event_in(struct snd_seq_fifo *f,
struct snd_seq_event *event)
{
struct snd_seq_event_cell *cell;
- unsigned long flags;
int err;
if (snd_BUG_ON(!f))
@@ -118,15 +116,15 @@ int snd_seq_fifo_event_in(struct snd_seq_fifo *f,
}
/* append new cells to fifo */
- spin_lock_irqsave(&f->lock, flags);
- if (f->tail != NULL)
- f->tail->next = cell;
- f->tail = cell;
- if (f->head == NULL)
- f->head = cell;
- cell->next = NULL;
- f->cells++;
- spin_unlock_irqrestore(&f->lock, flags);
+ scoped_guard(spinlock_irqsave, &f->lock) {
+ if (f->tail != NULL)
+ f->tail->next = cell;
+ f->tail = cell;
+ if (f->head == NULL)
+ f->head = cell;
+ cell->next = NULL;
+ f->cells++;
+ }
/* wakeup client */
if (waitqueue_active(&f->input_sleep))
@@ -199,16 +197,13 @@ int snd_seq_fifo_cell_out(struct snd_seq_fifo *f,
void snd_seq_fifo_cell_putback(struct snd_seq_fifo *f,
struct snd_seq_event_cell *cell)
{
- unsigned long flags;
-
if (cell) {
- spin_lock_irqsave(&f->lock, flags);
+ guard(spinlock_irqsave)(&f->lock);
cell->next = f->head;
f->head = cell;
if (!f->tail)
f->tail = cell;
f->cells++;
- spin_unlock_irqrestore(&f->lock, flags);
}
}
@@ -239,17 +234,17 @@ int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize)
return -ENOMEM;
}
- spin_lock_irq(&f->lock);
- /* remember old pool */
- oldpool = f->pool;
- oldhead = f->head;
- /* exchange pools */
- f->pool = newpool;
- f->head = NULL;
- f->tail = NULL;
- f->cells = 0;
- /* NOTE: overflow flag is not cleared */
- spin_unlock_irq(&f->lock);
+ scoped_guard(spinlock_irq, &f->lock) {
+ /* remember old pool */
+ oldpool = f->pool;
+ oldhead = f->head;
+ /* exchange pools */
+ f->pool = newpool;
+ f->head = NULL;
+ f->tail = NULL;
+ f->cells = 0;
+ /* NOTE: overflow flag is not cleared */
+ }
/* close the old pool and wait until all users are gone */
snd_seq_pool_mark_closing(oldpool);
@@ -268,16 +263,14 @@ int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize)
/* get the number of unused cells safely */
int snd_seq_fifo_unused_cells(struct snd_seq_fifo *f)
{
- unsigned long flags;
int cells;
if (!f)
return 0;
snd_use_lock_use(&f->use_lock);
- spin_lock_irqsave(&f->lock, flags);
- cells = snd_seq_unused_cells(f->pool);
- spin_unlock_irqrestore(&f->lock, flags);
+ scoped_guard(spinlock_irqsave, &f->lock)
+ cells = snd_seq_unused_cells(f->pool);
snd_use_lock_free(&f->use_lock);
return cells;
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 13/24] ALSA: seq: memory: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (11 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 12/24] ALSA: seq: fifo: " Takashi Iwai
@ 2024-02-23 16:27 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 14/24] ALSA: seq: ports: " Takashi Iwai
` (10 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:27 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/seq/seq_memory.c | 28 ++++++++++------------------
1 file changed, 10 insertions(+), 18 deletions(-)
diff --git a/sound/core/seq/seq_memory.c b/sound/core/seq/seq_memory.c
index e705e7538118..20155e3e87c6 100644
--- a/sound/core/seq/seq_memory.c
+++ b/sound/core/seq/seq_memory.c
@@ -232,7 +232,6 @@ static inline void free_cell(struct snd_seq_pool *pool,
void snd_seq_cell_free(struct snd_seq_event_cell * cell)
{
- unsigned long flags;
struct snd_seq_pool *pool;
if (snd_BUG_ON(!cell))
@@ -241,7 +240,7 @@ void snd_seq_cell_free(struct snd_seq_event_cell * cell)
if (snd_BUG_ON(!pool))
return;
- spin_lock_irqsave(&pool->lock, flags);
+ guard(spinlock_irqsave)(&pool->lock);
free_cell(pool, cell);
if (snd_seq_ev_is_variable(&cell->event)) {
if (cell->event.data.ext.len & SNDRV_SEQ_EXT_CHAINED) {
@@ -259,7 +258,6 @@ void snd_seq_cell_free(struct snd_seq_event_cell * cell)
if (snd_seq_output_ok(pool))
wake_up(&pool->output_sleep);
}
- spin_unlock_irqrestore(&pool->lock, flags);
}
@@ -449,9 +447,8 @@ int snd_seq_pool_init(struct snd_seq_pool *pool)
return -ENOMEM;
/* add new cells to the free cell list */
- spin_lock_irq(&pool->lock);
+ guard(spinlock_irq)(&pool->lock);
if (pool->ptr) {
- spin_unlock_irq(&pool->lock);
kvfree(cellptr);
return 0;
}
@@ -470,20 +467,16 @@ int snd_seq_pool_init(struct snd_seq_pool *pool)
/* init statistics */
pool->max_used = 0;
pool->total_elements = pool->size;
- spin_unlock_irq(&pool->lock);
return 0;
}
/* refuse the further insertion to the pool */
void snd_seq_pool_mark_closing(struct snd_seq_pool *pool)
{
- unsigned long flags;
-
if (snd_BUG_ON(!pool))
return;
- spin_lock_irqsave(&pool->lock, flags);
+ guard(spinlock_irqsave)(&pool->lock);
pool->closing = 1;
- spin_unlock_irqrestore(&pool->lock, flags);
}
/* remove events */
@@ -502,18 +495,17 @@ int snd_seq_pool_done(struct snd_seq_pool *pool)
schedule_timeout_uninterruptible(1);
/* release all resources */
- spin_lock_irq(&pool->lock);
- ptr = pool->ptr;
- pool->ptr = NULL;
- pool->free = NULL;
- pool->total_elements = 0;
- spin_unlock_irq(&pool->lock);
+ scoped_guard(spinlock_irq, &pool->lock) {
+ ptr = pool->ptr;
+ pool->ptr = NULL;
+ pool->free = NULL;
+ pool->total_elements = 0;
+ }
kvfree(ptr);
- spin_lock_irq(&pool->lock);
+ guard(spinlock_irq)(&pool->lock);
pool->closing = 0;
- spin_unlock_irq(&pool->lock);
return 0;
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 14/24] ALSA: seq: ports: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (12 preceding siblings ...)
2024-02-23 16:27 ` [PATCH 13/24] ALSA: seq: memory: " Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 15/24] ALSA: seq: queue: " Takashi Iwai
` (9 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/seq/seq_ports.c | 114 ++++++++++++++++---------------------
1 file changed, 49 insertions(+), 65 deletions(-)
diff --git a/sound/core/seq/seq_ports.c b/sound/core/seq/seq_ports.c
index f3f14ff0f80f..ca631ca4f2c6 100644
--- a/sound/core/seq/seq_ports.c
+++ b/sound/core/seq/seq_ports.c
@@ -48,17 +48,15 @@ struct snd_seq_client_port *snd_seq_port_use_ptr(struct snd_seq_client *client,
if (client == NULL)
return NULL;
- read_lock(&client->ports_lock);
+ guard(read_lock)(&client->ports_lock);
list_for_each_entry(port, &client->ports_list_head, list) {
if (port->addr.port == num) {
if (port->closing)
break; /* deleting now */
snd_use_lock_use(&port->use_lock);
- read_unlock(&client->ports_lock);
return port;
}
}
- read_unlock(&client->ports_lock);
return NULL; /* not found */
}
@@ -73,7 +71,7 @@ struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *cl
num = pinfo->addr.port;
found = NULL;
- read_lock(&client->ports_lock);
+ guard(read_lock)(&client->ports_lock);
list_for_each_entry(port, &client->ports_list_head, list) {
if ((port->capability & SNDRV_SEQ_PORT_CAP_INACTIVE) &&
!check_inactive)
@@ -93,7 +91,6 @@ struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *cl
else
snd_use_lock_use(&found->use_lock);
}
- read_unlock(&client->ports_lock);
return found;
}
@@ -145,13 +142,12 @@ int snd_seq_create_port(struct snd_seq_client *client, int port,
snd_use_lock_use(&new_port->use_lock);
num = max(port, 0);
- mutex_lock(&client->ports_mutex);
- write_lock_irq(&client->ports_lock);
+ guard(mutex)(&client->ports_mutex);
+ guard(write_lock_irq)(&client->ports_lock);
list_for_each_entry(p, &client->ports_list_head, list) {
if (p->addr.port == port) {
kfree(new_port);
- num = -EBUSY;
- goto unlock;
+ return -EBUSY;
}
if (p->addr.port > num)
break;
@@ -164,9 +160,6 @@ int snd_seq_create_port(struct snd_seq_client *client, int port,
new_port->addr.port = num; /* store the port number in the port */
sprintf(new_port->name, "port-%d", num);
*port_ret = new_port;
- unlock:
- write_unlock_irq(&client->ports_lock);
- mutex_unlock(&client->ports_mutex);
return num;
}
@@ -281,19 +274,18 @@ int snd_seq_delete_port(struct snd_seq_client *client, int port)
{
struct snd_seq_client_port *found = NULL, *p;
- mutex_lock(&client->ports_mutex);
- write_lock_irq(&client->ports_lock);
- list_for_each_entry(p, &client->ports_list_head, list) {
- if (p->addr.port == port) {
- /* ok found. delete from the list at first */
- list_del(&p->list);
- client->num_ports--;
- found = p;
- break;
+ scoped_guard(mutex, &client->ports_mutex) {
+ guard(write_lock_irq)(&client->ports_lock);
+ list_for_each_entry(p, &client->ports_list_head, list) {
+ if (p->addr.port == port) {
+ /* ok found. delete from the list at first */
+ list_del(&p->list);
+ client->num_ports--;
+ found = p;
+ break;
+ }
}
}
- write_unlock_irq(&client->ports_lock);
- mutex_unlock(&client->ports_mutex);
if (found)
return port_delete(client, found);
else
@@ -309,16 +301,16 @@ int snd_seq_delete_all_ports(struct snd_seq_client *client)
/* move the port list to deleted_list, and
* clear the port list in the client data.
*/
- mutex_lock(&client->ports_mutex);
- write_lock_irq(&client->ports_lock);
- if (! list_empty(&client->ports_list_head)) {
- list_add(&deleted_list, &client->ports_list_head);
- list_del_init(&client->ports_list_head);
- } else {
- INIT_LIST_HEAD(&deleted_list);
+ guard(mutex)(&client->ports_mutex);
+ scoped_guard(write_lock_irq, &client->ports_lock) {
+ if (!list_empty(&client->ports_list_head)) {
+ list_add(&deleted_list, &client->ports_list_head);
+ list_del_init(&client->ports_list_head);
+ } else {
+ INIT_LIST_HEAD(&deleted_list);
+ }
+ client->num_ports = 0;
}
- client->num_ports = 0;
- write_unlock_irq(&client->ports_lock);
/* remove each port in deleted_list */
list_for_each_entry_safe(port, tmp, &deleted_list, list) {
@@ -326,7 +318,6 @@ int snd_seq_delete_all_ports(struct snd_seq_client *client)
snd_seq_system_client_ev_port_exit(port->addr.client, port->addr.port);
port_delete(client, port);
}
- mutex_unlock(&client->ports_mutex);
return 0;
}
@@ -506,42 +497,37 @@ static int check_and_subscribe_port(struct snd_seq_client *client,
int err;
grp = is_src ? &port->c_src : &port->c_dest;
- err = -EBUSY;
- down_write(&grp->list_mutex);
+ guard(rwsem_write)(&grp->list_mutex);
if (exclusive) {
if (!list_empty(&grp->list_head))
- goto __error;
+ return -EBUSY;
} else {
if (grp->exclusive)
- goto __error;
+ return -EBUSY;
/* check whether already exists */
list_for_each(p, &grp->list_head) {
s = get_subscriber(p, is_src);
if (match_subs_info(&subs->info, &s->info))
- goto __error;
+ return -EBUSY;
}
}
err = subscribe_port(client, port, grp, &subs->info, ack);
if (err < 0) {
grp->exclusive = 0;
- goto __error;
+ return err;
}
/* add to list */
- write_lock_irq(&grp->list_lock);
+ guard(write_lock_irq)(&grp->list_lock);
if (is_src)
list_add_tail(&subs->src_list, &grp->list_head);
else
list_add_tail(&subs->dest_list, &grp->list_head);
grp->exclusive = exclusive;
atomic_inc(&subs->ref_count);
- write_unlock_irq(&grp->list_lock);
- err = 0;
- __error:
- up_write(&grp->list_mutex);
- return err;
+ return 0;
}
/* called with grp->list_mutex held */
@@ -556,12 +542,12 @@ static void __delete_and_unsubscribe_port(struct snd_seq_client *client,
grp = is_src ? &port->c_src : &port->c_dest;
list = is_src ? &subs->src_list : &subs->dest_list;
- write_lock_irq(&grp->list_lock);
- empty = list_empty(list);
- if (!empty)
- list_del_init(list);
- grp->exclusive = 0;
- write_unlock_irq(&grp->list_lock);
+ scoped_guard(write_lock_irq, &grp->list_lock) {
+ empty = list_empty(list);
+ if (!empty)
+ list_del_init(list);
+ grp->exclusive = 0;
+ }
if (!empty)
unsubscribe_port(client, port, grp, &subs->info, ack);
@@ -575,9 +561,8 @@ static void delete_and_unsubscribe_port(struct snd_seq_client *client,
struct snd_seq_port_subs_info *grp;
grp = is_src ? &port->c_src : &port->c_dest;
- down_write(&grp->list_mutex);
+ guard(rwsem_write)(&grp->list_mutex);
__delete_and_unsubscribe_port(client, port, subs, is_src, ack);
- up_write(&grp->list_mutex);
}
/* connect two ports */
@@ -639,18 +624,18 @@ int snd_seq_port_disconnect(struct snd_seq_client *connector,
/* always start from deleting the dest port for avoiding concurrent
* deletions
*/
- down_write(&dest->list_mutex);
- /* look for the connection */
- list_for_each_entry(subs, &dest->list_head, dest_list) {
- if (match_subs_info(info, &subs->info)) {
- __delete_and_unsubscribe_port(dest_client, dest_port,
- subs, false,
- connector->number != dest_client->number);
- err = 0;
- break;
+ scoped_guard(rwsem_write, &dest->list_mutex) {
+ /* look for the connection */
+ list_for_each_entry(subs, &dest->list_head, dest_list) {
+ if (match_subs_info(info, &subs->info)) {
+ __delete_and_unsubscribe_port(dest_client, dest_port,
+ subs, false,
+ connector->number != dest_client->number);
+ err = 0;
+ break;
+ }
}
}
- up_write(&dest->list_mutex);
if (err < 0)
return err;
@@ -669,7 +654,7 @@ int snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp,
struct snd_seq_subscribers *s;
int err = -ENOENT;
- down_read(&src_grp->list_mutex);
+ guard(rwsem_read)(&src_grp->list_mutex);
list_for_each_entry(s, &src_grp->list_head, src_list) {
if (addr_match(dest_addr, &s->info.dest)) {
*subs = s->info;
@@ -677,7 +662,6 @@ int snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp,
break;
}
}
- up_read(&src_grp->list_mutex);
return err;
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 15/24] ALSA: seq: queue: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (13 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 14/24] ALSA: seq: ports: " Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 16/24] ALSA: seq: timer: " Takashi Iwai
` (8 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/seq/seq_queue.c | 78 ++++++++++++++------------------------
1 file changed, 28 insertions(+), 50 deletions(-)
diff --git a/sound/core/seq/seq_queue.c b/sound/core/seq/seq_queue.c
index bc933104c3ee..500ee6b19c71 100644
--- a/sound/core/seq/seq_queue.c
+++ b/sound/core/seq/seq_queue.c
@@ -50,43 +50,35 @@ int snd_seq_queue_get_cur_queues(void)
static int queue_list_add(struct snd_seq_queue *q)
{
int i;
- unsigned long flags;
- spin_lock_irqsave(&queue_list_lock, flags);
+ guard(spinlock_irqsave)(&queue_list_lock);
for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
if (! queue_list[i]) {
queue_list[i] = q;
q->queue = i;
num_queues++;
- spin_unlock_irqrestore(&queue_list_lock, flags);
return i;
}
}
- spin_unlock_irqrestore(&queue_list_lock, flags);
return -1;
}
static struct snd_seq_queue *queue_list_remove(int id, int client)
{
struct snd_seq_queue *q;
- unsigned long flags;
- spin_lock_irqsave(&queue_list_lock, flags);
+ guard(spinlock_irqsave)(&queue_list_lock);
q = queue_list[id];
if (q) {
- spin_lock(&q->owner_lock);
+ guard(spinlock)(&q->owner_lock);
if (q->owner == client) {
/* found */
q->klocked = 1;
- spin_unlock(&q->owner_lock);
queue_list[id] = NULL;
num_queues--;
- spin_unlock_irqrestore(&queue_list_lock, flags);
return q;
}
- spin_unlock(&q->owner_lock);
}
- spin_unlock_irqrestore(&queue_list_lock, flags);
return NULL;
}
@@ -203,15 +195,13 @@ int snd_seq_queue_delete(int client, int queueid)
struct snd_seq_queue *queueptr(int queueid)
{
struct snd_seq_queue *q;
- unsigned long flags;
if (queueid < 0 || queueid >= SNDRV_SEQ_MAX_QUEUES)
return NULL;
- spin_lock_irqsave(&queue_list_lock, flags);
+ guard(spinlock_irqsave)(&queue_list_lock);
q = queue_list[queueid];
if (q)
snd_use_lock_use(&q->use_lock);
- spin_unlock_irqrestore(&queue_list_lock, flags);
return q;
}
@@ -239,7 +229,6 @@ struct snd_seq_queue *snd_seq_queue_find_name(char *name)
void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop)
{
- unsigned long flags;
struct snd_seq_event_cell *cell;
snd_seq_tick_time_t cur_tick;
snd_seq_real_time_t cur_time;
@@ -249,14 +238,13 @@ void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop)
return;
/* make this function non-reentrant */
- spin_lock_irqsave(&q->check_lock, flags);
- if (q->check_blocked) {
- q->check_again = 1;
- spin_unlock_irqrestore(&q->check_lock, flags);
- return; /* other thread is already checking queues */
+ scoped_guard(spinlock_irqsave, &q->check_lock) {
+ if (q->check_blocked) {
+ q->check_again = 1;
+ return; /* other thread is already checking queues */
+ }
+ q->check_blocked = 1;
}
- q->check_blocked = 1;
- spin_unlock_irqrestore(&q->check_lock, flags);
__again:
/* Process tick queue... */
@@ -283,16 +271,14 @@ void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop)
out:
/* free lock */
- spin_lock_irqsave(&q->check_lock, flags);
- if (q->check_again) {
- q->check_again = 0;
- if (processed < MAX_CELL_PROCESSES_IN_QUEUE) {
- spin_unlock_irqrestore(&q->check_lock, flags);
- goto __again;
+ scoped_guard(spinlock_irqsave, &q->check_lock) {
+ if (q->check_again) {
+ q->check_again = 0;
+ if (processed < MAX_CELL_PROCESSES_IN_QUEUE)
+ goto __again;
}
+ q->check_blocked = 0;
}
- q->check_blocked = 0;
- spin_unlock_irqrestore(&q->check_lock, flags);
}
@@ -361,25 +347,20 @@ static inline int check_access(struct snd_seq_queue *q, int client)
*/
static int queue_access_lock(struct snd_seq_queue *q, int client)
{
- unsigned long flags;
int access_ok;
- spin_lock_irqsave(&q->owner_lock, flags);
+ guard(spinlock_irqsave)(&q->owner_lock);
access_ok = check_access(q, client);
if (access_ok)
q->klocked = 1;
- spin_unlock_irqrestore(&q->owner_lock, flags);
return access_ok;
}
/* unlock the queue */
static inline void queue_access_unlock(struct snd_seq_queue *q)
{
- unsigned long flags;
-
- spin_lock_irqsave(&q->owner_lock, flags);
+ guard(spinlock_irqsave)(&q->owner_lock);
q->klocked = 0;
- spin_unlock_irqrestore(&q->owner_lock, flags);
}
/* exported - only checking permission */
@@ -387,13 +368,11 @@ int snd_seq_queue_check_access(int queueid, int client)
{
struct snd_seq_queue *q = queueptr(queueid);
int access_ok;
- unsigned long flags;
if (! q)
return 0;
- spin_lock_irqsave(&q->owner_lock, flags);
- access_ok = check_access(q, client);
- spin_unlock_irqrestore(&q->owner_lock, flags);
+ scoped_guard(spinlock_irqsave, &q->owner_lock)
+ access_ok = check_access(q, client);
queuefree(q);
return access_ok;
}
@@ -406,7 +385,6 @@ int snd_seq_queue_check_access(int queueid, int client)
int snd_seq_queue_set_owner(int queueid, int client, int locked)
{
struct snd_seq_queue *q = queueptr(queueid);
- unsigned long flags;
if (q == NULL)
return -EINVAL;
@@ -416,10 +394,10 @@ int snd_seq_queue_set_owner(int queueid, int client, int locked)
return -EPERM;
}
- spin_lock_irqsave(&q->owner_lock, flags);
- q->locked = locked ? 1 : 0;
- q->owner = client;
- spin_unlock_irqrestore(&q->owner_lock, flags);
+ scoped_guard(spinlock_irqsave, &q->owner_lock) {
+ q->locked = locked ? 1 : 0;
+ q->owner = client;
+ }
queue_access_unlock(q);
queuefree(q);
@@ -750,10 +728,10 @@ void snd_seq_info_queues_read(struct snd_info_entry *entry,
else
bpm = 0;
- spin_lock_irq(&q->owner_lock);
- locked = q->locked;
- owner = q->owner;
- spin_unlock_irq(&q->owner_lock);
+ scoped_guard(spinlock_irq, &q->owner_lock) {
+ locked = q->locked;
+ owner = q->owner;
+ }
snd_iprintf(buffer, "queue %d: [%s]\n", q->queue, q->name);
snd_iprintf(buffer, "owned by client : %d\n", owner);
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 16/24] ALSA: seq: timer: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (14 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 15/24] ALSA: seq: queue: " Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 17/24] ALSA: seq: midi: " Takashi Iwai
` (7 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/seq/seq_timer.c | 163 +++++++++++++------------------------
1 file changed, 58 insertions(+), 105 deletions(-)
diff --git a/sound/core/seq/seq_timer.c b/sound/core/seq/seq_timer.c
index 9863be6fd43e..ad2b97e2762d 100644
--- a/sound/core/seq/seq_timer.c
+++ b/sound/core/seq/seq_timer.c
@@ -75,9 +75,7 @@ void snd_seq_timer_delete(struct snd_seq_timer **tmr)
void snd_seq_timer_defaults(struct snd_seq_timer * tmr)
{
- unsigned long flags;
-
- spin_lock_irqsave(&tmr->lock, flags);
+ guard(spinlock_irqsave)(&tmr->lock);
/* setup defaults */
tmr->ppq = 96; /* 96 PPQ */
tmr->tempo = 500000; /* 120 BPM */
@@ -93,7 +91,6 @@ void snd_seq_timer_defaults(struct snd_seq_timer * tmr)
tmr->preferred_resolution = seq_default_timer_resolution;
tmr->skew = tmr->skew_base = SKEW_BASE;
- spin_unlock_irqrestore(&tmr->lock, flags);
}
static void seq_timer_reset(struct snd_seq_timer *tmr)
@@ -108,11 +105,8 @@ static void seq_timer_reset(struct snd_seq_timer *tmr)
void snd_seq_timer_reset(struct snd_seq_timer *tmr)
{
- unsigned long flags;
-
- spin_lock_irqsave(&tmr->lock, flags);
+ guard(spinlock_irqsave)(&tmr->lock);
seq_timer_reset(tmr);
- spin_unlock_irqrestore(&tmr->lock, flags);
}
@@ -121,7 +115,6 @@ static void snd_seq_timer_interrupt(struct snd_timer_instance *timeri,
unsigned long resolution,
unsigned long ticks)
{
- unsigned long flags;
struct snd_seq_queue *q = timeri->callback_data;
struct snd_seq_timer *tmr;
@@ -130,30 +123,28 @@ static void snd_seq_timer_interrupt(struct snd_timer_instance *timeri,
tmr = q->timer;
if (tmr == NULL)
return;
- spin_lock_irqsave(&tmr->lock, flags);
- if (!tmr->running) {
- spin_unlock_irqrestore(&tmr->lock, flags);
- return;
+
+ scoped_guard(spinlock_irqsave, &tmr->lock) {
+ if (!tmr->running)
+ return;
+
+ resolution *= ticks;
+ if (tmr->skew != tmr->skew_base) {
+ /* FIXME: assuming skew_base = 0x10000 */
+ resolution = (resolution >> 16) * tmr->skew +
+ (((resolution & 0xffff) * tmr->skew) >> 16);
+ }
+
+ /* update timer */
+ snd_seq_inc_time_nsec(&tmr->cur_time, resolution);
+
+ /* calculate current tick */
+ snd_seq_timer_update_tick(&tmr->tick, resolution);
+
+ /* register actual time of this timer update */
+ ktime_get_ts64(&tmr->last_update);
}
- resolution *= ticks;
- if (tmr->skew != tmr->skew_base) {
- /* FIXME: assuming skew_base = 0x10000 */
- resolution = (resolution >> 16) * tmr->skew +
- (((resolution & 0xffff) * tmr->skew) >> 16);
- }
-
- /* update timer */
- snd_seq_inc_time_nsec(&tmr->cur_time, resolution);
-
- /* calculate current tick */
- snd_seq_timer_update_tick(&tmr->tick, resolution);
-
- /* register actual time of this timer update */
- ktime_get_ts64(&tmr->last_update);
-
- spin_unlock_irqrestore(&tmr->lock, flags);
-
/* check queues and dispatch events */
snd_seq_check_queue(q, 1, 0);
}
@@ -161,18 +152,15 @@ static void snd_seq_timer_interrupt(struct snd_timer_instance *timeri,
/* set current tempo */
int snd_seq_timer_set_tempo(struct snd_seq_timer * tmr, int tempo)
{
- unsigned long flags;
-
if (snd_BUG_ON(!tmr))
return -EINVAL;
if (tempo <= 0)
return -EINVAL;
- spin_lock_irqsave(&tmr->lock, flags);
+ guard(spinlock_irqsave)(&tmr->lock);
if ((unsigned int)tempo != tmr->tempo) {
tmr->tempo = tempo;
snd_seq_timer_set_tick_resolution(tmr);
}
- spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
@@ -180,17 +168,15 @@ int snd_seq_timer_set_tempo(struct snd_seq_timer * tmr, int tempo)
int snd_seq_timer_set_tempo_ppq(struct snd_seq_timer *tmr, int tempo, int ppq)
{
int changed;
- unsigned long flags;
if (snd_BUG_ON(!tmr))
return -EINVAL;
if (tempo <= 0 || ppq <= 0)
return -EINVAL;
- spin_lock_irqsave(&tmr->lock, flags);
+ guard(spinlock_irqsave)(&tmr->lock);
if (tmr->running && (ppq != tmr->ppq)) {
/* refuse to change ppq on running timers */
/* because it will upset the song position (ticks) */
- spin_unlock_irqrestore(&tmr->lock, flags);
pr_debug("ALSA: seq: cannot change ppq of a running timer\n");
return -EBUSY;
}
@@ -199,7 +185,6 @@ int snd_seq_timer_set_tempo_ppq(struct snd_seq_timer *tmr, int tempo, int ppq)
tmr->ppq = ppq;
if (changed)
snd_seq_timer_set_tick_resolution(tmr);
- spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
@@ -207,15 +192,12 @@ int snd_seq_timer_set_tempo_ppq(struct snd_seq_timer *tmr, int tempo, int ppq)
int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr,
snd_seq_tick_time_t position)
{
- unsigned long flags;
-
if (snd_BUG_ON(!tmr))
return -EINVAL;
- spin_lock_irqsave(&tmr->lock, flags);
+ guard(spinlock_irqsave)(&tmr->lock);
tmr->tick.cur_tick = position;
tmr->tick.fraction = 0;
- spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
@@ -223,15 +205,12 @@ int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr,
int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr,
snd_seq_real_time_t position)
{
- unsigned long flags;
-
if (snd_BUG_ON(!tmr))
return -EINVAL;
snd_seq_sanity_real_time(&position);
- spin_lock_irqsave(&tmr->lock, flags);
+ guard(spinlock_irqsave)(&tmr->lock);
tmr->cur_time = position;
- spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
@@ -239,8 +218,6 @@ int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr,
int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew,
unsigned int base)
{
- unsigned long flags;
-
if (snd_BUG_ON(!tmr))
return -EINVAL;
@@ -249,9 +226,8 @@ int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew,
pr_debug("ALSA: seq: invalid skew base 0x%x\n", base);
return -EINVAL;
}
- spin_lock_irqsave(&tmr->lock, flags);
+ guard(spinlock_irqsave)(&tmr->lock);
tmr->skew = skew;
- spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
@@ -296,12 +272,12 @@ int snd_seq_timer_open(struct snd_seq_queue *q)
snd_timer_instance_free(t);
return err;
}
- spin_lock_irq(&tmr->lock);
- if (tmr->timeri)
- err = -EBUSY;
- else
- tmr->timeri = t;
- spin_unlock_irq(&tmr->lock);
+ scoped_guard(spinlock_irq, &tmr->lock) {
+ if (tmr->timeri)
+ err = -EBUSY;
+ else
+ tmr->timeri = t;
+ }
if (err < 0) {
snd_timer_close(t);
snd_timer_instance_free(t);
@@ -318,10 +294,10 @@ int snd_seq_timer_close(struct snd_seq_queue *q)
tmr = q->timer;
if (snd_BUG_ON(!tmr))
return -EINVAL;
- spin_lock_irq(&tmr->lock);
- t = tmr->timeri;
- tmr->timeri = NULL;
- spin_unlock_irq(&tmr->lock);
+ scoped_guard(spinlock_irq, &tmr->lock) {
+ t = tmr->timeri;
+ tmr->timeri = NULL;
+ }
if (t) {
snd_timer_close(t);
snd_timer_instance_free(t);
@@ -342,13 +318,8 @@ static int seq_timer_stop(struct snd_seq_timer *tmr)
int snd_seq_timer_stop(struct snd_seq_timer *tmr)
{
- unsigned long flags;
- int err;
-
- spin_lock_irqsave(&tmr->lock, flags);
- err = seq_timer_stop(tmr);
- spin_unlock_irqrestore(&tmr->lock, flags);
- return err;
+ guard(spinlock_irqsave)(&tmr->lock);
+ return seq_timer_stop(tmr);
}
static int initialize_timer(struct snd_seq_timer *tmr)
@@ -398,13 +369,8 @@ static int seq_timer_start(struct snd_seq_timer *tmr)
int snd_seq_timer_start(struct snd_seq_timer *tmr)
{
- unsigned long flags;
- int err;
-
- spin_lock_irqsave(&tmr->lock, flags);
- err = seq_timer_start(tmr);
- spin_unlock_irqrestore(&tmr->lock, flags);
- return err;
+ guard(spinlock_irqsave)(&tmr->lock);
+ return seq_timer_start(tmr);
}
static int seq_timer_continue(struct snd_seq_timer *tmr)
@@ -426,13 +392,8 @@ static int seq_timer_continue(struct snd_seq_timer *tmr)
int snd_seq_timer_continue(struct snd_seq_timer *tmr)
{
- unsigned long flags;
- int err;
-
- spin_lock_irqsave(&tmr->lock, flags);
- err = seq_timer_continue(tmr);
- spin_unlock_irqrestore(&tmr->lock, flags);
- return err;
+ guard(spinlock_irqsave)(&tmr->lock);
+ return seq_timer_continue(tmr);
}
/* return current 'real' time. use timeofday() to get better granularity. */
@@ -440,9 +401,8 @@ snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr,
bool adjust_ktime)
{
snd_seq_real_time_t cur_time;
- unsigned long flags;
- spin_lock_irqsave(&tmr->lock, flags);
+ guard(spinlock_irqsave)(&tmr->lock);
cur_time = tmr->cur_time;
if (adjust_ktime && tmr->running) {
struct timespec64 tm;
@@ -453,7 +413,6 @@ snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr,
cur_time.tv_sec += tm.tv_sec;
snd_seq_sanity_real_time(&cur_time);
}
- spin_unlock_irqrestore(&tmr->lock, flags);
return cur_time;
}
@@ -461,13 +420,8 @@ snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr,
high PPQ values) */
snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr)
{
- snd_seq_tick_time_t cur_tick;
- unsigned long flags;
-
- spin_lock_irqsave(&tmr->lock, flags);
- cur_tick = tmr->tick.cur_tick;
- spin_unlock_irqrestore(&tmr->lock, flags);
- return cur_tick;
+ guard(spinlock_irqsave)(&tmr->lock);
+ return tmr->tick.cur_tick;
}
@@ -486,19 +440,18 @@ void snd_seq_info_timer_read(struct snd_info_entry *entry,
q = queueptr(idx);
if (q == NULL)
continue;
- mutex_lock(&q->timer_mutex);
- tmr = q->timer;
- if (!tmr)
- goto unlock;
- ti = tmr->timeri;
- if (!ti)
- goto unlock;
- snd_iprintf(buffer, "Timer for queue %i : %s\n", q->queue, ti->timer->name);
- resolution = snd_timer_resolution(ti) * tmr->ticks;
- snd_iprintf(buffer, " Period time : %lu.%09lu\n", resolution / 1000000000, resolution % 1000000000);
- snd_iprintf(buffer, " Skew : %u / %u\n", tmr->skew, tmr->skew_base);
-unlock:
- mutex_unlock(&q->timer_mutex);
+ scoped_guard(mutex, &q->timer_mutex) {
+ tmr = q->timer;
+ if (!tmr)
+ break;
+ ti = tmr->timeri;
+ if (!ti)
+ break;
+ snd_iprintf(buffer, "Timer for queue %i : %s\n", q->queue, ti->timer->name);
+ resolution = snd_timer_resolution(ti) * tmr->ticks;
+ snd_iprintf(buffer, " Period time : %lu.%09lu\n", resolution / 1000000000, resolution % 1000000000);
+ snd_iprintf(buffer, " Skew : %u / %u\n", tmr->skew, tmr->skew_base);
+ }
queuefree(q);
}
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 17/24] ALSA: seq: midi: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (15 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 16/24] ALSA: seq: timer: " Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 18/24] ALSA: seq: ump: " Takashi Iwai
` (6 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/seq/seq_midi.c | 16 ++++------------
sound/core/seq/seq_midi_event.c | 14 +++-----------
2 files changed, 7 insertions(+), 23 deletions(-)
diff --git a/sound/core/seq/seq_midi.c b/sound/core/seq/seq_midi.c
index 0594269d92ab..ba52a77eda38 100644
--- a/sound/core/seq/seq_midi.c
+++ b/sound/core/seq/seq_midi.c
@@ -302,22 +302,19 @@ snd_seq_midisynth_probe(struct device *_dev)
if (ports > (256 / SNDRV_RAWMIDI_DEVICES))
ports = 256 / SNDRV_RAWMIDI_DEVICES;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
client = synths[card->number];
if (client == NULL) {
newclient = 1;
client = kzalloc(sizeof(*client), GFP_KERNEL);
- if (client == NULL) {
- mutex_unlock(®ister_mutex);
+ if (client == NULL)
return -ENOMEM;
- }
client->seq_client =
snd_seq_create_kernel_client(
card, 0, "%s", card->shortname[0] ?
(const char *)card->shortname : "External MIDI");
if (client->seq_client < 0) {
kfree(client);
- mutex_unlock(®ister_mutex);
return -ENOMEM;
}
}
@@ -398,7 +395,6 @@ snd_seq_midisynth_probe(struct device *_dev)
client->num_ports++;
if (newclient)
synths[card->number] = client;
- mutex_unlock(®ister_mutex);
return 0; /* success */
__nomem:
@@ -411,7 +407,6 @@ snd_seq_midisynth_probe(struct device *_dev)
snd_seq_delete_kernel_client(client->seq_client);
kfree(client);
}
- mutex_unlock(®ister_mutex);
return -ENOMEM;
}
@@ -425,12 +420,10 @@ snd_seq_midisynth_remove(struct device *_dev)
struct snd_card *card = dev->card;
int device = dev->device, p, ports;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
client = synths[card->number];
- if (client == NULL || client->ports[device] == NULL) {
- mutex_unlock(®ister_mutex);
+ if (client == NULL || client->ports[device] == NULL)
return -ENODEV;
- }
ports = client->ports_per_device[device];
client->ports_per_device[device] = 0;
msynth = client->ports[device];
@@ -444,7 +437,6 @@ snd_seq_midisynth_remove(struct device *_dev)
synths[card->number] = NULL;
kfree(client);
}
- mutex_unlock(®ister_mutex);
return 0;
}
diff --git a/sound/core/seq/seq_midi_event.c b/sound/core/seq/seq_midi_event.c
index 7511462fe071..fa9dfc53c3fc 100644
--- a/sound/core/seq/seq_midi_event.c
+++ b/sound/core/seq/seq_midi_event.c
@@ -144,21 +144,15 @@ static inline void reset_encode(struct snd_midi_event *dev)
void snd_midi_event_reset_encode(struct snd_midi_event *dev)
{
- unsigned long flags;
-
- spin_lock_irqsave(&dev->lock, flags);
+ guard(spinlock_irqsave)(&dev->lock);
reset_encode(dev);
- spin_unlock_irqrestore(&dev->lock, flags);
}
EXPORT_SYMBOL(snd_midi_event_reset_encode);
void snd_midi_event_reset_decode(struct snd_midi_event *dev)
{
- unsigned long flags;
-
- spin_lock_irqsave(&dev->lock, flags);
+ guard(spinlock_irqsave)(&dev->lock);
dev->lastcmd = 0xff;
- spin_unlock_irqrestore(&dev->lock, flags);
}
EXPORT_SYMBOL(snd_midi_event_reset_decode);
@@ -177,7 +171,6 @@ bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
struct snd_seq_event *ev)
{
bool rc = false;
- unsigned long flags;
if (c >= MIDI_CMD_COMMON_CLOCK) {
/* real-time event */
@@ -187,7 +180,7 @@ bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
return ev->type != SNDRV_SEQ_EVENT_NONE;
}
- spin_lock_irqsave(&dev->lock, flags);
+ guard(spinlock_irqsave)(&dev->lock);
if ((c & 0x80) &&
(c != MIDI_CMD_COMMON_SYSEX_END || dev->type != ST_SYSEX)) {
/* new command */
@@ -236,7 +229,6 @@ bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
}
}
- spin_unlock_irqrestore(&dev->lock, flags);
return rc;
}
EXPORT_SYMBOL(snd_midi_event_encode_byte);
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 18/24] ALSA: seq: ump: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (16 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 17/24] ALSA: seq: midi: " Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 19/24] ALSA: seq: virmidi: " Takashi Iwai
` (5 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/seq/seq_ump_client.c | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/sound/core/seq/seq_ump_client.c b/sound/core/seq/seq_ump_client.c
index ccac2d3a9fbc..c627d72f7fe2 100644
--- a/sound/core/seq/seq_ump_client.c
+++ b/sound/core/seq/seq_ump_client.c
@@ -115,21 +115,19 @@ static int seq_ump_process_event(struct snd_seq_event *ev, int direct,
static int seq_ump_client_open(struct seq_ump_client *client, int dir)
{
struct snd_ump_endpoint *ump = client->ump;
- int err = 0;
+ int err;
- mutex_lock(&ump->open_mutex);
+ guard(mutex)(&ump->open_mutex);
if (dir == STR_OUT && !client->opened[dir]) {
err = snd_rawmidi_kernel_open(&ump->core, 0,
SNDRV_RAWMIDI_LFLG_OUTPUT |
SNDRV_RAWMIDI_LFLG_APPEND,
&client->out_rfile);
if (err < 0)
- goto unlock;
+ return err;
}
client->opened[dir]++;
- unlock:
- mutex_unlock(&ump->open_mutex);
- return err;
+ return 0;
}
/* close the rawmidi */
@@ -137,11 +135,10 @@ static int seq_ump_client_close(struct seq_ump_client *client, int dir)
{
struct snd_ump_endpoint *ump = client->ump;
- mutex_lock(&ump->open_mutex);
+ guard(mutex)(&ump->open_mutex);
if (!--client->opened[dir])
if (dir == STR_OUT)
snd_rawmidi_kernel_release(&client->out_rfile);
- mutex_unlock(&ump->open_mutex);
return 0;
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 19/24] ALSA: seq: virmidi: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (17 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 18/24] ALSA: seq: ump: " Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 20/24] ALSA: seq: prioq: " Takashi Iwai
` (4 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/seq/seq_virmidi.c | 18 ++++++++----------
1 file changed, 8 insertions(+), 10 deletions(-)
diff --git a/sound/core/seq/seq_virmidi.c b/sound/core/seq/seq_virmidi.c
index 35f93b43dd2a..b4672613c261 100644
--- a/sound/core/seq/seq_virmidi.c
+++ b/sound/core/seq/seq_virmidi.c
@@ -199,11 +199,10 @@ static int snd_virmidi_input_open(struct snd_rawmidi_substream *substream)
vmidi->client = rdev->client;
vmidi->port = rdev->port;
runtime->private_data = vmidi;
- down_write(&rdev->filelist_sem);
- write_lock_irq(&rdev->filelist_lock);
- list_add_tail(&vmidi->list, &rdev->filelist);
- write_unlock_irq(&rdev->filelist_lock);
- up_write(&rdev->filelist_sem);
+ scoped_guard(rwsem_write, &rdev->filelist_sem) {
+ guard(write_lock_irq)(&rdev->filelist_lock);
+ list_add_tail(&vmidi->list, &rdev->filelist);
+ }
vmidi->rdev = rdev;
return 0;
}
@@ -243,11 +242,10 @@ static int snd_virmidi_input_close(struct snd_rawmidi_substream *substream)
struct snd_virmidi_dev *rdev = substream->rmidi->private_data;
struct snd_virmidi *vmidi = substream->runtime->private_data;
- down_write(&rdev->filelist_sem);
- write_lock_irq(&rdev->filelist_lock);
- list_del(&vmidi->list);
- write_unlock_irq(&rdev->filelist_lock);
- up_write(&rdev->filelist_sem);
+ scoped_guard(rwsem_write, &rdev->filelist_sem) {
+ guard(write_lock_irq)(&rdev->filelist_lock);
+ list_del(&vmidi->list);
+ }
snd_midi_event_free(vmidi->parser);
substream->runtime->private_data = NULL;
kfree(vmidi);
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 20/24] ALSA: seq: prioq: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (18 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 19/24] ALSA: seq: virmidi: " Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 21/24] ALSA: pcm: " Takashi Iwai
` (3 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/seq/seq_prioq.c | 59 +++++++++++++++++---------------------
1 file changed, 26 insertions(+), 33 deletions(-)
diff --git a/sound/core/seq/seq_prioq.c b/sound/core/seq/seq_prioq.c
index e062df7610e1..e649485a8772 100644
--- a/sound/core/seq/seq_prioq.c
+++ b/sound/core/seq/seq_prioq.c
@@ -132,7 +132,6 @@ int snd_seq_prioq_cell_in(struct snd_seq_prioq * f,
struct snd_seq_event_cell * cell)
{
struct snd_seq_event_cell *cur, *prev;
- unsigned long flags;
int count;
int prior;
@@ -142,7 +141,7 @@ int snd_seq_prioq_cell_in(struct snd_seq_prioq * f,
/* check flags */
prior = (cell->event.flags & SNDRV_SEQ_PRIORITY_MASK);
- spin_lock_irqsave(&f->lock, flags);
+ guard(spinlock_irqsave)(&f->lock);
/* check if this element needs to inserted at the end (ie. ordered
data is inserted) This will be very likeley if a sequencer
@@ -154,7 +153,6 @@ int snd_seq_prioq_cell_in(struct snd_seq_prioq * f,
f->tail = cell;
cell->next = NULL;
f->cells++;
- spin_unlock_irqrestore(&f->lock, flags);
return 0;
}
}
@@ -179,7 +177,6 @@ int snd_seq_prioq_cell_in(struct snd_seq_prioq * f,
prev = cur;
cur = cur->next;
if (! --count) {
- spin_unlock_irqrestore(&f->lock, flags);
pr_err("ALSA: seq: cannot find a pointer.. infinite loop?\n");
return -EINVAL;
}
@@ -195,7 +192,6 @@ int snd_seq_prioq_cell_in(struct snd_seq_prioq * f,
if (cur == NULL) /* reached end of the list */
f->tail = cell;
f->cells++;
- spin_unlock_irqrestore(&f->lock, flags);
return 0;
}
@@ -213,14 +209,13 @@ struct snd_seq_event_cell *snd_seq_prioq_cell_out(struct snd_seq_prioq *f,
void *current_time)
{
struct snd_seq_event_cell *cell;
- unsigned long flags;
if (f == NULL) {
pr_debug("ALSA: seq: snd_seq_prioq_cell_in() called with NULL prioq\n");
return NULL;
}
- spin_lock_irqsave(&f->lock, flags);
+ guard(spinlock_irqsave)(&f->lock);
cell = f->head;
if (cell && current_time && !event_is_ready(&cell->event, current_time))
cell = NULL;
@@ -235,7 +230,6 @@ struct snd_seq_event_cell *snd_seq_prioq_cell_out(struct snd_seq_prioq *f,
f->cells--;
}
- spin_unlock_irqrestore(&f->lock, flags);
return cell;
}
@@ -256,37 +250,36 @@ static void prioq_remove_cells(struct snd_seq_prioq *f,
void *arg)
{
register struct snd_seq_event_cell *cell, *next;
- unsigned long flags;
struct snd_seq_event_cell *prev = NULL;
struct snd_seq_event_cell *freefirst = NULL, *freeprev = NULL, *freenext;
/* collect all removed cells */
- spin_lock_irqsave(&f->lock, flags);
- for (cell = f->head; cell; cell = next) {
- next = cell->next;
- if (!match(cell, arg)) {
- prev = cell;
- continue;
+ scoped_guard(spinlock_irqsave, &f->lock) {
+ for (cell = f->head; cell; cell = next) {
+ next = cell->next;
+ if (!match(cell, arg)) {
+ prev = cell;
+ continue;
+ }
+
+ /* remove cell from prioq */
+ if (cell == f->head)
+ f->head = cell->next;
+ else
+ prev->next = cell->next;
+ if (cell == f->tail)
+ f->tail = cell->next;
+ f->cells--;
+
+ /* add cell to free list */
+ cell->next = NULL;
+ if (freefirst == NULL)
+ freefirst = cell;
+ else
+ freeprev->next = cell;
+ freeprev = cell;
}
-
- /* remove cell from prioq */
- if (cell == f->head)
- f->head = cell->next;
- else
- prev->next = cell->next;
- if (cell == f->tail)
- f->tail = cell->next;
- f->cells--;
-
- /* add cell to free list */
- cell->next = NULL;
- if (freefirst == NULL)
- freefirst = cell;
- else
- freeprev->next = cell;
- freeprev = cell;
}
- spin_unlock_irqrestore(&f->lock, flags);
/* remove selected cells */
while (freefirst) {
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 21/24] ALSA: pcm: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (19 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 20/24] ALSA: seq: prioq: " Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 22/24] ALSA: pcm: Use guard() for PCM stream locks Takashi Iwai
` (2 subsequent siblings)
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/pcm.c | 90 ++++++++++++++---------------------------
sound/core/pcm_memory.c | 30 ++++++--------
sound/core/pcm_native.c | 48 ++++++++--------------
3 files changed, 59 insertions(+), 109 deletions(-)
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 87d27fbdfe5c..dc37f3508dc7 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -91,9 +91,8 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
if (get_user(device, (int __user *)arg))
return -EFAULT;
- mutex_lock(®ister_mutex);
- device = snd_pcm_next(card, device);
- mutex_unlock(®ister_mutex);
+ scoped_guard(mutex, ®ister_mutex)
+ device = snd_pcm_next(card, device);
if (put_user(device, (int __user *)arg))
return -EFAULT;
return 0;
@@ -106,7 +105,6 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
struct snd_pcm *pcm;
struct snd_pcm_str *pstr;
struct snd_pcm_substream *substream;
- int err;
info = (struct snd_pcm_info __user *)arg;
if (get_user(device, &info->device))
@@ -118,35 +116,23 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
stream = array_index_nospec(stream, 2);
if (get_user(subdevice, &info->subdevice))
return -EFAULT;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
pcm = snd_pcm_get(card, device);
- if (pcm == NULL) {
- err = -ENXIO;
- goto _error;
- }
+ if (pcm == NULL)
+ return -ENXIO;
pstr = &pcm->streams[stream];
- if (pstr->substream_count == 0) {
- err = -ENOENT;
- goto _error;
- }
- if (subdevice >= pstr->substream_count) {
- err = -ENXIO;
- goto _error;
- }
+ if (pstr->substream_count == 0)
+ return -ENOENT;
+ if (subdevice >= pstr->substream_count)
+ return -ENXIO;
for (substream = pstr->substream; substream;
substream = substream->next)
if (substream->number == (int)subdevice)
break;
- if (substream == NULL) {
- err = -ENXIO;
- goto _error;
- }
- mutex_lock(&pcm->open_mutex);
- err = snd_pcm_info_user(substream, info);
- mutex_unlock(&pcm->open_mutex);
- _error:
- mutex_unlock(®ister_mutex);
- return err;
+ if (substream == NULL)
+ return -ENXIO;
+ guard(mutex)(&pcm->open_mutex);
+ return snd_pcm_info_user(substream, info);
}
case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
{
@@ -389,15 +375,15 @@ static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
struct snd_pcm_substream *substream = entry->private_data;
struct snd_pcm_runtime *runtime;
- mutex_lock(&substream->pcm->open_mutex);
+ guard(mutex)(&substream->pcm->open_mutex);
runtime = substream->runtime;
if (!runtime) {
snd_iprintf(buffer, "closed\n");
- goto unlock;
+ return;
}
if (runtime->state == SNDRV_PCM_STATE_OPEN) {
snd_iprintf(buffer, "no setup\n");
- goto unlock;
+ return;
}
snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
@@ -416,8 +402,6 @@ static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
}
#endif
- unlock:
- mutex_unlock(&substream->pcm->open_mutex);
}
static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
@@ -426,15 +410,15 @@ static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
struct snd_pcm_substream *substream = entry->private_data;
struct snd_pcm_runtime *runtime;
- mutex_lock(&substream->pcm->open_mutex);
+ guard(mutex)(&substream->pcm->open_mutex);
runtime = substream->runtime;
if (!runtime) {
snd_iprintf(buffer, "closed\n");
- goto unlock;
+ return;
}
if (runtime->state == SNDRV_PCM_STATE_OPEN) {
snd_iprintf(buffer, "no setup\n");
- goto unlock;
+ return;
}
snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
@@ -444,8 +428,6 @@ static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
- unlock:
- mutex_unlock(&substream->pcm->open_mutex);
}
static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
@@ -456,17 +438,17 @@ static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
struct snd_pcm_status64 status;
int err;
- mutex_lock(&substream->pcm->open_mutex);
+ guard(mutex)(&substream->pcm->open_mutex);
runtime = substream->runtime;
if (!runtime) {
snd_iprintf(buffer, "closed\n");
- goto unlock;
+ return;
}
memset(&status, 0, sizeof(status));
err = snd_pcm_status64(substream, &status);
if (err < 0) {
snd_iprintf(buffer, "error %d\n", err);
- goto unlock;
+ return;
}
snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
@@ -480,8 +462,6 @@ static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
snd_iprintf(buffer, "-----\n");
snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
- unlock:
- mutex_unlock(&substream->pcm->open_mutex);
}
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
@@ -1009,9 +989,8 @@ void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
kfree(runtime->hw_constraints.rules);
/* Avoid concurrent access to runtime via PCM timer interface */
if (substream->timer) {
- spin_lock_irq(&substream->timer->lock);
- substream->runtime = NULL;
- spin_unlock_irq(&substream->timer->lock);
+ scoped_guard(spinlock_irq, &substream->timer->lock)
+ substream->runtime = NULL;
} else {
substream->runtime = NULL;
}
@@ -1068,10 +1047,10 @@ static int snd_pcm_dev_register(struct snd_device *device)
return -ENXIO;
pcm = device->device_data;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
err = snd_pcm_add(pcm);
if (err)
- goto unlock;
+ return err;
for (cidx = 0; cidx < 2; cidx++) {
int devtype = -1;
if (pcm->streams[cidx].substream == NULL)
@@ -1090,7 +1069,7 @@ static int snd_pcm_dev_register(struct snd_device *device)
pcm->streams[cidx].dev);
if (err < 0) {
list_del_init(&pcm->list);
- goto unlock;
+ return err;
}
for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
@@ -1098,9 +1077,6 @@ static int snd_pcm_dev_register(struct snd_device *device)
}
pcm_call_notify(pcm, n_register);
-
- unlock:
- mutex_unlock(®ister_mutex);
return err;
}
@@ -1110,8 +1086,8 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
struct snd_pcm_substream *substream;
int cidx;
- mutex_lock(®ister_mutex);
- mutex_lock(&pcm->open_mutex);
+ guard(mutex)(®ister_mutex);
+ guard(mutex)(&pcm->open_mutex);
wake_up(&pcm->open_wait);
list_del_init(&pcm->list);
@@ -1138,8 +1114,6 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
snd_unregister_device(pcm->streams[cidx].dev);
free_chmap(&pcm->streams[cidx]);
}
- mutex_unlock(&pcm->open_mutex);
- mutex_unlock(®ister_mutex);
return 0;
}
@@ -1164,7 +1138,7 @@ int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
!notify->n_unregister ||
!notify->n_disconnect))
return -EINVAL;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
if (nfree) {
list_del(¬ify->list);
list_for_each_entry(pcm, &snd_pcm_devices, list)
@@ -1174,7 +1148,6 @@ int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
list_for_each_entry(pcm, &snd_pcm_devices, list)
notify->n_register(pcm);
}
- mutex_unlock(®ister_mutex);
return 0;
}
EXPORT_SYMBOL(snd_pcm_notify);
@@ -1190,7 +1163,7 @@ static void snd_pcm_proc_read(struct snd_info_entry *entry,
{
struct snd_pcm *pcm;
- mutex_lock(®ister_mutex);
+ guard(mutex)(®ister_mutex);
list_for_each_entry(pcm, &snd_pcm_devices, list) {
snd_iprintf(buffer, "%02i-%02i: %s : %s",
pcm->card->number, pcm->device, pcm->id, pcm->name);
@@ -1202,7 +1175,6 @@ static void snd_pcm_proc_read(struct snd_info_entry *entry,
pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
snd_iprintf(buffer, "\n");
}
- mutex_unlock(®ister_mutex);
}
static struct snd_info_entry *snd_pcm_proc_entry;
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index a0b951471699..506386959f08 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -38,17 +38,15 @@ static void __update_allocated_size(struct snd_card *card, ssize_t bytes)
static void update_allocated_size(struct snd_card *card, ssize_t bytes)
{
- mutex_lock(&card->memory_mutex);
+ guard(mutex)(&card->memory_mutex);
__update_allocated_size(card, bytes);
- mutex_unlock(&card->memory_mutex);
}
static void decrease_allocated_size(struct snd_card *card, size_t bytes)
{
- mutex_lock(&card->memory_mutex);
+ guard(mutex)(&card->memory_mutex);
WARN_ON(card->total_pcm_alloc_bytes < bytes);
__update_allocated_size(card, -(ssize_t)bytes);
- mutex_unlock(&card->memory_mutex);
}
static int do_alloc_pages(struct snd_card *card, int type, struct device *dev,
@@ -58,14 +56,12 @@ static int do_alloc_pages(struct snd_card *card, int type, struct device *dev,
int err;
/* check and reserve the requested size */
- mutex_lock(&card->memory_mutex);
- if (max_alloc_per_card &&
- card->total_pcm_alloc_bytes + size > max_alloc_per_card) {
- mutex_unlock(&card->memory_mutex);
- return -ENOMEM;
+ scoped_guard(mutex, &card->memory_mutex) {
+ if (max_alloc_per_card &&
+ card->total_pcm_alloc_bytes + size > max_alloc_per_card)
+ return -ENOMEM;
+ __update_allocated_size(card, size);
}
- __update_allocated_size(card, size);
- mutex_unlock(&card->memory_mutex);
if (str == SNDRV_PCM_STREAM_PLAYBACK)
dir = DMA_TO_DEVICE;
@@ -191,20 +187,20 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
size_t size;
struct snd_dma_buffer new_dmab;
- mutex_lock(&substream->pcm->open_mutex);
+ guard(mutex)(&substream->pcm->open_mutex);
if (substream->runtime) {
buffer->error = -EBUSY;
- goto unlock;
+ return;
}
if (!snd_info_get_line(buffer, line, sizeof(line))) {
snd_info_get_str(str, line, sizeof(str));
size = simple_strtoul(str, NULL, 10) * 1024;
if ((size != 0 && size < 8192) || size > substream->dma_max) {
buffer->error = -EINVAL;
- goto unlock;
+ return;
}
if (substream->dma_buffer.bytes == size)
- goto unlock;
+ return;
memset(&new_dmab, 0, sizeof(new_dmab));
new_dmab.dev = substream->dma_buffer.dev;
if (size > 0) {
@@ -218,7 +214,7 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
substream->pcm->card->number, substream->pcm->device,
substream->stream ? 'c' : 'p', substream->number,
substream->pcm->name, size);
- goto unlock;
+ return;
}
substream->buffer_bytes_max = size;
} else {
@@ -230,8 +226,6 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
} else {
buffer->error = -EINVAL;
}
- unlock:
- mutex_unlock(&substream->pcm->open_mutex);
}
static inline void preallocate_info_init(struct snd_pcm_substream *substream)
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 0e84de4b484d..f2a0cbb25bb7 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1398,17 +1398,15 @@ static int snd_pcm_action_nonatomic(const struct action_ops *ops,
int res;
/* Guarantee the group members won't change during non-atomic action */
- down_read(&snd_pcm_link_rwsem);
+ guard(rwsem_read)(&snd_pcm_link_rwsem);
res = snd_pcm_buffer_access_lock(substream->runtime);
if (res < 0)
- goto unlock;
+ return res;
if (snd_pcm_stream_linked(substream))
res = snd_pcm_action_group(ops, substream, state, false);
else
res = snd_pcm_action_single(ops, substream, state);
snd_pcm_buffer_access_unlock(substream->runtime);
- unlock:
- up_read(&snd_pcm_link_rwsem);
return res;
}
@@ -2259,7 +2257,6 @@ static bool is_pcm_file(struct file *file)
*/
static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
{
- int res = 0;
struct snd_pcm_file *pcm_file;
struct snd_pcm_substream *substream1;
struct snd_pcm_group *group __free(kfree) = NULL;
@@ -2281,20 +2278,15 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
group = kzalloc(sizeof(*group), GFP_KERNEL);
if (!group)
return -ENOMEM;
-
snd_pcm_group_init(group);
- down_write(&snd_pcm_link_rwsem);
+ guard(rwsem_write)(&snd_pcm_link_rwsem);
if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
substream->runtime->state != substream1->runtime->state ||
- substream->pcm->nonatomic != substream1->pcm->nonatomic) {
- res = -EBADFD;
- goto _end;
- }
- if (snd_pcm_stream_linked(substream1)) {
- res = -EALREADY;
- goto _end;
- }
+ substream->pcm->nonatomic != substream1->pcm->nonatomic)
+ return -EBADFD;
+ if (snd_pcm_stream_linked(substream1))
+ return -EALREADY;
snd_pcm_stream_lock_irq(substream);
if (!snd_pcm_stream_linked(substream)) {
@@ -2310,9 +2302,7 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
refcount_inc(&target_group->refs);
snd_pcm_stream_unlock(substream1);
snd_pcm_group_unlock_irq(target_group, nonatomic);
- _end:
- up_write(&snd_pcm_link_rwsem);
- return res;
+ return 0;
}
static void relink_to_local(struct snd_pcm_substream *substream)
@@ -2327,14 +2317,11 @@ static int snd_pcm_unlink(struct snd_pcm_substream *substream)
struct snd_pcm_group *group;
bool nonatomic = substream->pcm->nonatomic;
bool do_free = false;
- int res = 0;
- down_write(&snd_pcm_link_rwsem);
+ guard(rwsem_write)(&snd_pcm_link_rwsem);
- if (!snd_pcm_stream_linked(substream)) {
- res = -EALREADY;
- goto _end;
- }
+ if (!snd_pcm_stream_linked(substream))
+ return -EALREADY;
group = substream->group;
snd_pcm_group_lock_irq(group, nonatomic);
@@ -2353,10 +2340,7 @@ static int snd_pcm_unlink(struct snd_pcm_substream *substream)
snd_pcm_group_unlock_irq(group, nonatomic);
if (do_free)
kfree(group);
-
- _end:
- up_write(&snd_pcm_link_rwsem);
- return res;
+ return 0;
}
/*
@@ -2929,10 +2913,10 @@ static int snd_pcm_release(struct inode *inode, struct file *file)
/* block until the device gets woken up as it may touch the hardware */
snd_power_wait(pcm->card);
- mutex_lock(&pcm->open_mutex);
- snd_pcm_release_substream(substream);
- kfree(pcm_file);
- mutex_unlock(&pcm->open_mutex);
+ scoped_guard(mutex, &pcm->open_mutex) {
+ snd_pcm_release_substream(substream);
+ kfree(pcm_file);
+ }
wake_up(&pcm->open_wait);
module_put(pcm->card->module);
snd_card_file_remove(pcm->card, file);
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 22/24] ALSA: pcm: Use guard() for PCM stream locks
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (20 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 21/24] ALSA: pcm: " Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 23/24] ALSA: pcm: oss: Use guard() for setup Takashi Iwai
2024-02-23 16:28 ` [PATCH 24/24] ALSA: control_led: Use guard() for locking Takashi Iwai
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
Define guard() usage for PCM stream locking and use it in appropriate
places.
The pair of snd_pcm_stream_lock() and snd_pcm_stream_unlock() can be
presented with guard(pcm_stream_lock) now.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
include/sound/pcm.h | 12 ++
sound/core/oss/pcm_oss.c | 29 ++--
sound/core/pcm_compat.c | 66 +++++----
sound/core/pcm_lib.c | 10 +-
sound/core/pcm_native.c | 292 +++++++++++++++++----------------------
5 files changed, 191 insertions(+), 218 deletions(-)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index cc175c623dac..210096f124ee 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -659,6 +659,18 @@ void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
flags = _snd_pcm_stream_lock_irqsave_nested(substream); \
} while (0)
+/* definitions for guard(); use like guard(pcm_stream_lock) */
+DEFINE_LOCK_GUARD_1(pcm_stream_lock, struct snd_pcm_substream,
+ snd_pcm_stream_lock(_T->lock),
+ snd_pcm_stream_unlock(_T->lock))
+DEFINE_LOCK_GUARD_1(pcm_stream_lock_irq, struct snd_pcm_substream,
+ snd_pcm_stream_lock_irq(_T->lock),
+ snd_pcm_stream_unlock_irq(_T->lock))
+DEFINE_LOCK_GUARD_1(pcm_stream_lock_irqsave, struct snd_pcm_substream,
+ snd_pcm_stream_lock_irqsave(_T->lock, _T->flags),
+ snd_pcm_stream_unlock_irqrestore(_T->lock, _T->flags),
+ unsigned long flags)
+
/**
* snd_pcm_group_for_each_entry - iterate over the linked substreams
* @s: the iterator
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index e4e292b2db06..49ea092e90f9 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -1623,9 +1623,8 @@ static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
break;
result = 0;
set_current_state(TASK_INTERRUPTIBLE);
- snd_pcm_stream_lock_irq(substream);
- state = runtime->state;
- snd_pcm_stream_unlock_irq(substream);
+ scoped_guard(pcm_stream_lock_irq, substream)
+ state = runtime->state;
if (state != SNDRV_PCM_STATE_RUNNING) {
set_current_state(TASK_RUNNING);
break;
@@ -2840,23 +2839,23 @@ static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
if (psubstream != NULL) {
struct snd_pcm_runtime *runtime = psubstream->runtime;
poll_wait(file, &runtime->sleep, wait);
- snd_pcm_stream_lock_irq(psubstream);
- if (runtime->state != SNDRV_PCM_STATE_DRAINING &&
- (runtime->state != SNDRV_PCM_STATE_RUNNING ||
- snd_pcm_oss_playback_ready(psubstream)))
- mask |= EPOLLOUT | EPOLLWRNORM;
- snd_pcm_stream_unlock_irq(psubstream);
+ scoped_guard(pcm_stream_lock_irq, psubstream) {
+ if (runtime->state != SNDRV_PCM_STATE_DRAINING &&
+ (runtime->state != SNDRV_PCM_STATE_RUNNING ||
+ snd_pcm_oss_playback_ready(psubstream)))
+ mask |= EPOLLOUT | EPOLLWRNORM;
+ }
}
if (csubstream != NULL) {
struct snd_pcm_runtime *runtime = csubstream->runtime;
snd_pcm_state_t ostate;
poll_wait(file, &runtime->sleep, wait);
- snd_pcm_stream_lock_irq(csubstream);
- ostate = runtime->state;
- if (ostate != SNDRV_PCM_STATE_RUNNING ||
- snd_pcm_oss_capture_ready(csubstream))
- mask |= EPOLLIN | EPOLLRDNORM;
- snd_pcm_stream_unlock_irq(csubstream);
+ scoped_guard(pcm_stream_lock_irq, csubstream) {
+ ostate = runtime->state;
+ if (ostate != SNDRV_PCM_STATE_RUNNING ||
+ snd_pcm_oss_capture_ready(csubstream))
+ mask |= EPOLLIN | EPOLLRDNORM;
+ }
if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
struct snd_pcm_oss_file ofile;
memset(&ofile, 0, sizeof(ofile));
diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c
index ef3c0d177510..a42ec7f5a1da 100644
--- a/sound/core/pcm_compat.c
+++ b/sound/core/pcm_compat.c
@@ -432,22 +432,22 @@ static int snd_pcm_ioctl_sync_ptr_x32(struct snd_pcm_substream *substream,
boundary = recalculate_boundary(runtime);
if (!boundary)
boundary = 0x7fffffff;
- snd_pcm_stream_lock_irq(substream);
- /* FIXME: we should consider the boundary for the sync from app */
- if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
- control->appl_ptr = scontrol.appl_ptr;
- else
- scontrol.appl_ptr = control->appl_ptr % boundary;
- if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
- control->avail_min = scontrol.avail_min;
- else
- scontrol.avail_min = control->avail_min;
- sstatus.state = status->state;
- sstatus.hw_ptr = status->hw_ptr % boundary;
- sstatus.tstamp = status->tstamp;
- sstatus.suspended_state = status->suspended_state;
- sstatus.audio_tstamp = status->audio_tstamp;
- snd_pcm_stream_unlock_irq(substream);
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ /* FIXME: we should consider the boundary for the sync from app */
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
+ control->appl_ptr = scontrol.appl_ptr;
+ else
+ scontrol.appl_ptr = control->appl_ptr % boundary;
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
+ control->avail_min = scontrol.avail_min;
+ else
+ scontrol.avail_min = control->avail_min;
+ sstatus.state = status->state;
+ sstatus.hw_ptr = status->hw_ptr % boundary;
+ sstatus.tstamp = status->tstamp;
+ sstatus.suspended_state = status->suspended_state;
+ sstatus.audio_tstamp = status->audio_tstamp;
+ }
if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
if (put_user(sstatus.state, &src->s.status.state) ||
@@ -510,26 +510,24 @@ static int snd_pcm_ioctl_sync_ptr_buggy(struct snd_pcm_substream *substream,
if (err < 0)
return err;
}
- snd_pcm_stream_lock_irq(substream);
- if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
- err = pcm_lib_apply_appl_ptr(substream, sync_cp->appl_ptr);
- if (err < 0) {
- snd_pcm_stream_unlock_irq(substream);
- return err;
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
+ err = pcm_lib_apply_appl_ptr(substream, sync_cp->appl_ptr);
+ if (err < 0)
+ return err;
+ } else {
+ sync_cp->appl_ptr = control->appl_ptr;
}
- } else {
- sync_cp->appl_ptr = control->appl_ptr;
+ if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
+ control->avail_min = sync_cp->avail_min;
+ else
+ sync_cp->avail_min = control->avail_min;
+ sync_ptr.s.status.state = status->state;
+ sync_ptr.s.status.hw_ptr = status->hw_ptr;
+ sync_ptr.s.status.tstamp = status->tstamp;
+ sync_ptr.s.status.suspended_state = status->suspended_state;
+ sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
}
- if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
- control->avail_min = sync_cp->avail_min;
- else
- sync_cp->avail_min = control->avail_min;
- sync_ptr.s.status.state = status->state;
- sync_ptr.s.status.hw_ptr = status->hw_ptr;
- sync_ptr.s.status.tstamp = status->tstamp;
- sync_ptr.s.status.suspended_state = status->suspended_state;
- sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
- snd_pcm_stream_unlock_irq(substream);
if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 41103e5c43ce..6f73b3c2c205 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -1744,8 +1744,8 @@ static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
void *arg)
{
struct snd_pcm_runtime *runtime = substream->runtime;
- unsigned long flags;
- snd_pcm_stream_lock_irqsave(substream, flags);
+
+ guard(pcm_stream_lock_irqsave)(substream);
if (snd_pcm_running(substream) &&
snd_pcm_update_hw_ptr(substream) >= 0)
runtime->status->hw_ptr %= runtime->buffer_size;
@@ -1753,7 +1753,6 @@ static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
runtime->status->hw_ptr = 0;
runtime->hw_ptr_wrap = 0;
}
- snd_pcm_stream_unlock_irqrestore(substream, flags);
return 0;
}
@@ -1899,14 +1898,11 @@ EXPORT_SYMBOL(snd_pcm_period_elapsed_under_stream_lock);
*/
void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
{
- unsigned long flags;
-
if (snd_BUG_ON(!substream))
return;
- snd_pcm_stream_lock_irqsave(substream, flags);
+ guard(pcm_stream_lock_irqsave)(substream);
snd_pcm_period_elapsed_under_stream_lock(substream);
- snd_pcm_stream_unlock_irqrestore(substream, flags);
}
EXPORT_SYMBOL(snd_pcm_period_elapsed);
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index f2a0cbb25bb7..c1396c802409 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -604,10 +604,9 @@ static int period_to_usecs(struct snd_pcm_runtime *runtime)
static void snd_pcm_set_state(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
- snd_pcm_stream_lock_irq(substream);
+ guard(pcm_stream_lock_irq)(substream);
if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
__snd_pcm_set_state(substream->runtime, state);
- snd_pcm_stream_unlock_irq(substream);
}
static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
@@ -733,20 +732,20 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
err = snd_pcm_buffer_access_lock(runtime);
if (err < 0)
return err;
- snd_pcm_stream_lock_irq(substream);
- switch (runtime->state) {
- case SNDRV_PCM_STATE_OPEN:
- case SNDRV_PCM_STATE_SETUP:
- case SNDRV_PCM_STATE_PREPARED:
- if (!is_oss_stream(substream) &&
- atomic_read(&substream->mmap_count))
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ switch (runtime->state) {
+ case SNDRV_PCM_STATE_OPEN:
+ case SNDRV_PCM_STATE_SETUP:
+ case SNDRV_PCM_STATE_PREPARED:
+ if (!is_oss_stream(substream) &&
+ atomic_read(&substream->mmap_count))
+ err = -EBADFD;
+ break;
+ default:
err = -EBADFD;
- break;
- default:
- err = -EBADFD;
- break;
+ break;
+ }
}
- snd_pcm_stream_unlock_irq(substream);
if (err)
goto unlock;
@@ -896,18 +895,18 @@ static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
result = snd_pcm_buffer_access_lock(runtime);
if (result < 0)
return result;
- snd_pcm_stream_lock_irq(substream);
- switch (runtime->state) {
- case SNDRV_PCM_STATE_SETUP:
- case SNDRV_PCM_STATE_PREPARED:
- if (atomic_read(&substream->mmap_count))
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ switch (runtime->state) {
+ case SNDRV_PCM_STATE_SETUP:
+ case SNDRV_PCM_STATE_PREPARED:
+ if (atomic_read(&substream->mmap_count))
+ result = -EBADFD;
+ break;
+ default:
result = -EBADFD;
- break;
- default:
- result = -EBADFD;
- break;
+ break;
+ }
}
- snd_pcm_stream_unlock_irq(substream);
if (result)
goto unlock;
result = do_hw_free(substream);
@@ -927,12 +926,10 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
- snd_pcm_stream_lock_irq(substream);
- if (runtime->state == SNDRV_PCM_STATE_OPEN) {
- snd_pcm_stream_unlock_irq(substream);
- return -EBADFD;
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ if (runtime->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
}
- snd_pcm_stream_unlock_irq(substream);
if (params->tstamp_mode < 0 ||
params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
@@ -952,24 +949,24 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
return -EINVAL;
}
err = 0;
- snd_pcm_stream_lock_irq(substream);
- runtime->tstamp_mode = params->tstamp_mode;
- if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
- runtime->tstamp_type = params->tstamp_type;
- runtime->period_step = params->period_step;
- runtime->control->avail_min = params->avail_min;
- runtime->start_threshold = params->start_threshold;
- runtime->stop_threshold = params->stop_threshold;
- runtime->silence_threshold = params->silence_threshold;
- runtime->silence_size = params->silence_size;
- params->boundary = runtime->boundary;
- if (snd_pcm_running(substream)) {
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
- runtime->silence_size > 0)
- snd_pcm_playback_silence(substream, ULONG_MAX);
- err = snd_pcm_update_state(substream, runtime);
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ runtime->tstamp_mode = params->tstamp_mode;
+ if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
+ runtime->tstamp_type = params->tstamp_type;
+ runtime->period_step = params->period_step;
+ runtime->control->avail_min = params->avail_min;
+ runtime->start_threshold = params->start_threshold;
+ runtime->stop_threshold = params->stop_threshold;
+ runtime->silence_threshold = params->silence_threshold;
+ runtime->silence_size = params->silence_size;
+ params->boundary = runtime->boundary;
+ if (snd_pcm_running(substream)) {
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+ runtime->silence_size > 0)
+ snd_pcm_playback_silence(substream, ULONG_MAX);
+ err = snd_pcm_update_state(substream, runtime);
+ }
}
- snd_pcm_stream_unlock_irq(substream);
return err;
}
@@ -1003,7 +1000,7 @@ int snd_pcm_status64(struct snd_pcm_substream *substream,
{
struct snd_pcm_runtime *runtime = substream->runtime;
- snd_pcm_stream_lock_irq(substream);
+ guard(pcm_stream_lock_irq)(substream);
snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
&runtime->audio_tstamp_config);
@@ -1024,7 +1021,7 @@ int snd_pcm_status64(struct snd_pcm_substream *substream,
status->state = runtime->state;
status->suspended_state = runtime->suspended_state;
if (status->state == SNDRV_PCM_STATE_OPEN)
- goto _end;
+ return 0;
status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
if (snd_pcm_running(substream)) {
@@ -1069,8 +1066,6 @@ int snd_pcm_status64(struct snd_pcm_substream *substream,
status->overrange = runtime->overrange;
runtime->avail_max = 0;
runtime->overrange = 0;
- _end:
- snd_pcm_stream_unlock_irq(substream);
return 0;
}
@@ -1155,12 +1150,10 @@ static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
channel = info->channel;
runtime = substream->runtime;
- snd_pcm_stream_lock_irq(substream);
- if (runtime->state == SNDRV_PCM_STATE_OPEN) {
- snd_pcm_stream_unlock_irq(substream);
- return -EBADFD;
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ if (runtime->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
}
- snd_pcm_stream_unlock_irq(substream);
if (channel >= runtime->channels)
return -EINVAL;
memset(info, 0, sizeof(*info));
@@ -1381,12 +1374,8 @@ static int snd_pcm_action_lock_irq(const struct action_ops *ops,
struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
- int res;
-
- snd_pcm_stream_lock_irq(substream);
- res = snd_pcm_action(ops, substream, state);
- snd_pcm_stream_unlock_irq(substream);
- return res;
+ guard(pcm_stream_lock_irq)(substream);
+ return snd_pcm_action(ops, substream, state);
}
/*
@@ -1576,12 +1565,9 @@ int snd_pcm_drain_done(struct snd_pcm_substream *substream)
*/
int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
{
- unsigned long flags;
-
- snd_pcm_stream_lock_irqsave(substream, flags);
+ guard(pcm_stream_lock_irqsave)(substream);
if (substream->runtime && snd_pcm_running(substream))
__snd_pcm_xrun(substream);
- snd_pcm_stream_unlock_irqrestore(substream, flags);
return 0;
}
EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
@@ -1733,14 +1719,9 @@ static const struct action_ops snd_pcm_action_suspend = {
*/
static int snd_pcm_suspend(struct snd_pcm_substream *substream)
{
- int err;
- unsigned long flags;
-
- snd_pcm_stream_lock_irqsave(substream, flags);
- err = snd_pcm_action(&snd_pcm_action_suspend, substream,
- ACTION_ARG_IGNORE);
- snd_pcm_stream_unlock_irqrestore(substream, flags);
- return err;
+ guard(pcm_stream_lock_irqsave)(substream);
+ return snd_pcm_action(&snd_pcm_action_suspend, substream,
+ ACTION_ARG_IGNORE);
}
/**
@@ -1856,22 +1837,17 @@ static int snd_pcm_resume(struct snd_pcm_substream *substream)
static int snd_pcm_xrun(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
- int result;
- snd_pcm_stream_lock_irq(substream);
+ guard(pcm_stream_lock_irq)(substream);
switch (runtime->state) {
case SNDRV_PCM_STATE_XRUN:
- result = 0; /* already there */
- break;
+ return 0; /* already there */
case SNDRV_PCM_STATE_RUNNING:
__snd_pcm_xrun(substream);
- result = 0;
- break;
+ return 0;
default:
- result = -EBADFD;
+ return -EBADFD;
}
- snd_pcm_stream_unlock_irq(substream);
- return result;
}
/*
@@ -1900,13 +1876,12 @@ static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
if (err < 0)
return err;
- snd_pcm_stream_lock_irq(substream);
+ guard(pcm_stream_lock_irq)(substream);
runtime->hw_ptr_base = 0;
runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
runtime->status->hw_ptr % runtime->period_size;
runtime->silence_start = runtime->status->hw_ptr;
runtime->silence_filled = 0;
- snd_pcm_stream_unlock_irq(substream);
return 0;
}
@@ -1914,12 +1889,11 @@ static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
- snd_pcm_stream_lock_irq(substream);
+ guard(pcm_stream_lock_irq)(substream);
runtime->control->appl_ptr = runtime->status->hw_ptr;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, ULONG_MAX);
- snd_pcm_stream_unlock_irq(substream);
}
static const struct action_ops snd_pcm_action_reset = {
@@ -1995,16 +1969,16 @@ static int snd_pcm_prepare(struct snd_pcm_substream *substream,
else
f_flags = substream->f_flags;
- snd_pcm_stream_lock_irq(substream);
- switch (substream->runtime->state) {
- case SNDRV_PCM_STATE_PAUSED:
- snd_pcm_pause(substream, false);
- fallthrough;
- case SNDRV_PCM_STATE_SUSPENDED:
- snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
- break;
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ switch (substream->runtime->state) {
+ case SNDRV_PCM_STATE_PAUSED:
+ snd_pcm_pause(substream, false);
+ fallthrough;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
+ break;
+ }
}
- snd_pcm_stream_unlock_irq(substream);
return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
substream,
@@ -2221,14 +2195,13 @@ static int snd_pcm_drop(struct snd_pcm_substream *substream)
runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
return -EBADFD;
- snd_pcm_stream_lock_irq(substream);
+ guard(pcm_stream_lock_irq)(substream);
/* resume pause */
if (runtime->state == SNDRV_PCM_STATE_PAUSED)
snd_pcm_pause(substream, false);
snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
/* runtime->control->appl_ptr = runtime->status->hw_ptr; */
- snd_pcm_stream_unlock_irq(substream);
return result;
}
@@ -2288,13 +2261,13 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
if (snd_pcm_stream_linked(substream1))
return -EALREADY;
- snd_pcm_stream_lock_irq(substream);
- if (!snd_pcm_stream_linked(substream)) {
- snd_pcm_group_assign(substream, group);
- group = NULL; /* assigned, don't free this one below */
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ if (!snd_pcm_stream_linked(substream)) {
+ snd_pcm_group_assign(substream, group);
+ group = NULL; /* assigned, don't free this one below */
+ }
+ target_group = substream->group;
}
- target_group = substream->group;
- snd_pcm_stream_unlock_irq(substream);
snd_pcm_group_lock_irq(target_group, nonatomic);
snd_pcm_stream_lock_nested(substream1);
@@ -3000,12 +2973,12 @@ static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
if (frames == 0)
return 0;
- snd_pcm_stream_lock_irq(substream);
- ret = do_pcm_hwsync(substream);
- if (!ret)
- ret = rewind_appl_ptr(substream, frames,
- snd_pcm_hw_avail(substream));
- snd_pcm_stream_unlock_irq(substream);
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ ret = do_pcm_hwsync(substream);
+ if (!ret)
+ ret = rewind_appl_ptr(substream, frames,
+ snd_pcm_hw_avail(substream));
+ }
if (ret >= 0)
snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
return ret;
@@ -3019,12 +2992,12 @@ static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
if (frames == 0)
return 0;
- snd_pcm_stream_lock_irq(substream);
- ret = do_pcm_hwsync(substream);
- if (!ret)
- ret = forward_appl_ptr(substream, frames,
- snd_pcm_avail(substream));
- snd_pcm_stream_unlock_irq(substream);
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ ret = do_pcm_hwsync(substream);
+ if (!ret)
+ ret = forward_appl_ptr(substream, frames,
+ snd_pcm_avail(substream));
+ }
if (ret >= 0)
snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
return ret;
@@ -3035,11 +3008,11 @@ static int snd_pcm_delay(struct snd_pcm_substream *substream,
{
int err;
- snd_pcm_stream_lock_irq(substream);
- err = do_pcm_hwsync(substream);
- if (delay && !err)
- *delay = snd_pcm_calc_delay(substream);
- snd_pcm_stream_unlock_irq(substream);
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ err = do_pcm_hwsync(substream);
+ if (delay && !err)
+ *delay = snd_pcm_calc_delay(substream);
+ }
snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
return err;
@@ -3071,27 +3044,25 @@ static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
if (err < 0)
return err;
}
- snd_pcm_stream_lock_irq(substream);
- if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
- err = pcm_lib_apply_appl_ptr(substream,
- sync_ptr.c.control.appl_ptr);
- if (err < 0) {
- snd_pcm_stream_unlock_irq(substream);
- return err;
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
+ err = pcm_lib_apply_appl_ptr(substream,
+ sync_ptr.c.control.appl_ptr);
+ if (err < 0)
+ return err;
+ } else {
+ sync_ptr.c.control.appl_ptr = control->appl_ptr;
}
- } else {
- sync_ptr.c.control.appl_ptr = control->appl_ptr;
+ if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
+ control->avail_min = sync_ptr.c.control.avail_min;
+ else
+ sync_ptr.c.control.avail_min = control->avail_min;
+ sync_ptr.s.status.state = status->state;
+ sync_ptr.s.status.hw_ptr = status->hw_ptr;
+ sync_ptr.s.status.tstamp = status->tstamp;
+ sync_ptr.s.status.suspended_state = status->suspended_state;
+ sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
}
- if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
- control->avail_min = sync_ptr.c.control.avail_min;
- else
- sync_ptr.c.control.avail_min = control->avail_min;
- sync_ptr.s.status.state = status->state;
- sync_ptr.s.status.hw_ptr = status->hw_ptr;
- sync_ptr.s.status.tstamp = status->tstamp;
- sync_ptr.s.status.suspended_state = status->suspended_state;
- sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
- snd_pcm_stream_unlock_irq(substream);
if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
@@ -3169,27 +3140,25 @@ static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
boundary = recalculate_boundary(runtime);
if (! boundary)
boundary = 0x7fffffff;
- snd_pcm_stream_lock_irq(substream);
- /* FIXME: we should consider the boundary for the sync from app */
- if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
- err = pcm_lib_apply_appl_ptr(substream,
- scontrol.appl_ptr);
- if (err < 0) {
- snd_pcm_stream_unlock_irq(substream);
- return err;
- }
- } else
- scontrol.appl_ptr = control->appl_ptr % boundary;
- if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
- control->avail_min = scontrol.avail_min;
- else
- scontrol.avail_min = control->avail_min;
- sstatus.state = status->state;
- sstatus.hw_ptr = status->hw_ptr % boundary;
- sstatus.tstamp = status->tstamp;
- sstatus.suspended_state = status->suspended_state;
- sstatus.audio_tstamp = status->audio_tstamp;
- snd_pcm_stream_unlock_irq(substream);
+ scoped_guard(pcm_stream_lock_irq, substream) {
+ /* FIXME: we should consider the boundary for the sync from app */
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
+ err = pcm_lib_apply_appl_ptr(substream,
+ scontrol.appl_ptr);
+ if (err < 0)
+ return err;
+ } else
+ scontrol.appl_ptr = control->appl_ptr % boundary;
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
+ control->avail_min = scontrol.avail_min;
+ else
+ scontrol.avail_min = control->avail_min;
+ sstatus.state = status->state;
+ sstatus.hw_ptr = status->hw_ptr % boundary;
+ sstatus.tstamp = status->tstamp;
+ sstatus.suspended_state = status->suspended_state;
+ sstatus.audio_tstamp = status->audio_tstamp;
+ }
if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
if (put_user(sstatus.state, &src->s.status.state) ||
@@ -3628,7 +3597,7 @@ static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
poll_wait(file, &runtime->sleep, wait);
mask = 0;
- snd_pcm_stream_lock_irq(substream);
+ guard(pcm_stream_lock_irq)(substream);
avail = snd_pcm_avail(substream);
switch (runtime->state) {
case SNDRV_PCM_STATE_RUNNING:
@@ -3648,7 +3617,6 @@ static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
mask = ok | EPOLLERR;
break;
}
- snd_pcm_stream_unlock_irq(substream);
return mask;
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 23/24] ALSA: pcm: oss: Use guard() for setup
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (21 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 22/24] ALSA: pcm: Use guard() for PCM stream locks Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
2024-02-23 16:28 ` [PATCH 24/24] ALSA: control_led: Use guard() for locking Takashi Iwai
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
The setup_mutex in PCM oss code can be simplified with guard().
(params_lock is tough and not trivial to covert, though.)
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/oss/pcm_oss.c | 12 +++---------
1 file changed, 3 insertions(+), 9 deletions(-)
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 49ea092e90f9..7386982cf40e 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -2333,7 +2333,7 @@ static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
{
struct snd_pcm_oss_setup *setup;
- mutex_lock(&pcm->streams[stream].oss.setup_mutex);
+ guard(mutex)(&pcm->streams[stream].oss.setup_mutex);
do {
for (setup = pcm->streams[stream].oss.setup_list; setup;
setup = setup->next) {
@@ -2344,7 +2344,6 @@ static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
out:
if (setup)
*rsetup = *setup;
- mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
}
static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
@@ -2950,7 +2949,7 @@ static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
{
struct snd_pcm_str *pstr = entry->private_data;
struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
- mutex_lock(&pstr->oss.setup_mutex);
+ guard(mutex)(&pstr->oss.setup_mutex);
while (setup) {
snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
setup->task_name,
@@ -2964,7 +2963,6 @@ static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
setup->nosilence ? " no-silence" : "");
setup = setup->next;
}
- mutex_unlock(&pstr->oss.setup_mutex);
}
static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
@@ -2990,12 +2988,11 @@ static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
struct snd_pcm_oss_setup *setup, *setup1, template;
while (!snd_info_get_line(buffer, line, sizeof(line))) {
- mutex_lock(&pstr->oss.setup_mutex);
+ guard(mutex)(&pstr->oss.setup_mutex);
memset(&template, 0, sizeof(template));
ptr = snd_info_get_str(task_name, line, sizeof(task_name));
if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
snd_pcm_oss_proc_free_setup_list(pstr);
- mutex_unlock(&pstr->oss.setup_mutex);
continue;
}
for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
@@ -3035,7 +3032,6 @@ static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
setup = kmalloc(sizeof(*setup), GFP_KERNEL);
if (! setup) {
buffer->error = -ENOMEM;
- mutex_unlock(&pstr->oss.setup_mutex);
return;
}
if (pstr->oss.setup_list == NULL)
@@ -3049,12 +3045,10 @@ static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
if (! template.task_name) {
kfree(setup);
buffer->error = -ENOMEM;
- mutex_unlock(&pstr->oss.setup_mutex);
return;
}
}
*setup = template;
- mutex_unlock(&pstr->oss.setup_mutex);
}
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
* [PATCH 24/24] ALSA: control_led: Use guard() for locking
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
` (22 preceding siblings ...)
2024-02-23 16:28 ` [PATCH 23/24] ALSA: pcm: oss: Use guard() for setup Takashi Iwai
@ 2024-02-23 16:28 ` Takashi Iwai
23 siblings, 0 replies; 25+ messages in thread
From: Takashi Iwai @ 2024-02-23 16:28 UTC (permalink / raw)
To: linux-sound
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
A couple of functions that use snd_card_ref() and *_unref() are also
cleaned up with a defined class, too.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/control_led.c | 150 +++++++++++++++++----------------------
1 file changed, 65 insertions(+), 85 deletions(-)
diff --git a/sound/core/control_led.c b/sound/core/control_led.c
index a78eb48927c7..3d37e9fa7b9c 100644
--- a/sound/core/control_led.c
+++ b/sound/core/control_led.c
@@ -147,29 +147,27 @@ static void snd_ctl_led_set_state(struct snd_card *card, unsigned int access,
return;
route = -1;
found = false;
- mutex_lock(&snd_ctl_led_mutex);
- /* the card may not be registered (active) at this point */
- if (card && !snd_ctl_led_card_valid[card->number]) {
- mutex_unlock(&snd_ctl_led_mutex);
- return;
- }
- list_for_each_entry(lctl, &led->controls, list) {
- if (lctl->kctl == kctl && lctl->index_offset == ioff)
- found = true;
- UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
- }
- if (!found && kctl && card) {
- lctl = kzalloc(sizeof(*lctl), GFP_KERNEL);
- if (lctl) {
- lctl->card = card;
- lctl->access = access;
- lctl->kctl = kctl;
- lctl->index_offset = ioff;
- list_add(&lctl->list, &led->controls);
+ scoped_guard(mutex, &snd_ctl_led_mutex) {
+ /* the card may not be registered (active) at this point */
+ if (card && !snd_ctl_led_card_valid[card->number])
+ return;
+ list_for_each_entry(lctl, &led->controls, list) {
+ if (lctl->kctl == kctl && lctl->index_offset == ioff)
+ found = true;
UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
}
+ if (!found && kctl && card) {
+ lctl = kzalloc(sizeof(*lctl), GFP_KERNEL);
+ if (lctl) {
+ lctl->card = card;
+ lctl->access = access;
+ lctl->kctl = kctl;
+ lctl->index_offset = ioff;
+ list_add(&lctl->list, &led->controls);
+ UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
+ }
+ }
}
- mutex_unlock(&snd_ctl_led_mutex);
switch (led->mode) {
case MODE_OFF: route = 1; break;
case MODE_ON: route = 0; break;
@@ -201,14 +199,13 @@ static unsigned int snd_ctl_led_remove(struct snd_kcontrol *kctl, unsigned int i
struct snd_ctl_led_ctl *lctl;
unsigned int ret = 0;
- mutex_lock(&snd_ctl_led_mutex);
+ guard(mutex)(&snd_ctl_led_mutex);
lctl = snd_ctl_led_find(kctl, ioff);
if (lctl && (access == 0 || access != lctl->access)) {
ret = lctl->access;
list_del(&lctl->list);
kfree(lctl);
}
- mutex_unlock(&snd_ctl_led_mutex);
return ret;
}
@@ -239,44 +236,36 @@ static void snd_ctl_led_notify(struct snd_card *card, unsigned int mask,
}
}
+DEFINE_FREE(snd_card_unref, struct snd_card *, if (_T) snd_card_unref(_T))
+
static int snd_ctl_led_set_id(int card_number, struct snd_ctl_elem_id *id,
unsigned int group, bool set)
{
- struct snd_card *card;
+ struct snd_card *card __free(snd_card_unref) = NULL;
struct snd_kcontrol *kctl;
struct snd_kcontrol_volatile *vd;
unsigned int ioff, access, new_access;
- int err = 0;
card = snd_card_ref(card_number);
- if (card) {
- down_write(&card->controls_rwsem);
- kctl = snd_ctl_find_id_locked(card, id);
- if (kctl) {
- ioff = snd_ctl_get_ioff(kctl, id);
- vd = &kctl->vd[ioff];
- access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
- if (access != 0 && access != group_to_access(group)) {
- err = -EXDEV;
- goto unlock;
- }
- new_access = vd->access & ~SNDRV_CTL_ELEM_ACCESS_LED_MASK;
- if (set)
- new_access |= group_to_access(group);
- if (new_access != vd->access) {
- vd->access = new_access;
- snd_ctl_led_notify(card, SNDRV_CTL_EVENT_MASK_INFO, kctl, ioff);
- }
- } else {
- err = -ENOENT;
- }
-unlock:
- up_write(&card->controls_rwsem);
- snd_card_unref(card);
- } else {
- err = -ENXIO;
+ if (!card)
+ return -ENXIO;
+ guard(rwsem_write)(&card->controls_rwsem);
+ kctl = snd_ctl_find_id_locked(card, id);
+ if (!kctl)
+ return -ENOENT;
+ ioff = snd_ctl_get_ioff(kctl, id);
+ vd = &kctl->vd[ioff];
+ access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
+ if (access != 0 && access != group_to_access(group))
+ return -EXDEV;
+ new_access = vd->access & ~SNDRV_CTL_ELEM_ACCESS_LED_MASK;
+ if (set)
+ new_access |= group_to_access(group);
+ if (new_access != vd->access) {
+ vd->access = new_access;
+ snd_ctl_led_notify(card, SNDRV_CTL_EVENT_MASK_INFO, kctl, ioff);
}
- return err;
+ return 0;
}
static void snd_ctl_led_refresh(void)
@@ -312,7 +301,7 @@ static void snd_ctl_led_clean(struct snd_card *card)
static int snd_ctl_led_reset(int card_number, unsigned int group)
{
- struct snd_card *card;
+ struct snd_card *card __free(snd_card_unref) = NULL;
struct snd_ctl_led *led;
struct snd_ctl_led_ctl *lctl;
struct snd_kcontrol_volatile *vd;
@@ -322,26 +311,22 @@ static int snd_ctl_led_reset(int card_number, unsigned int group)
if (!card)
return -ENXIO;
- mutex_lock(&snd_ctl_led_mutex);
- if (!snd_ctl_led_card_valid[card_number]) {
- mutex_unlock(&snd_ctl_led_mutex);
- snd_card_unref(card);
- return -ENXIO;
- }
- led = &snd_ctl_leds[group];
+ scoped_guard(mutex, &snd_ctl_led_mutex) {
+ if (!snd_ctl_led_card_valid[card_number])
+ return -ENXIO;
+ led = &snd_ctl_leds[group];
repeat:
- list_for_each_entry(lctl, &led->controls, list)
- if (lctl->card == card) {
- vd = &lctl->kctl->vd[lctl->index_offset];
- vd->access &= ~group_to_access(group);
- snd_ctl_led_ctl_destroy(lctl);
- change = true;
- goto repeat;
- }
- mutex_unlock(&snd_ctl_led_mutex);
+ list_for_each_entry(lctl, &led->controls, list)
+ if (lctl->card == card) {
+ vd = &lctl->kctl->vd[lctl->index_offset];
+ vd->access &= ~group_to_access(group);
+ snd_ctl_led_ctl_destroy(lctl);
+ change = true;
+ goto repeat;
+ }
+ }
if (change)
snd_ctl_led_set_state(NULL, group_to_access(group), NULL, 0);
- snd_card_unref(card);
return 0;
}
@@ -353,9 +338,8 @@ static void snd_ctl_led_register(struct snd_card *card)
if (snd_BUG_ON(card->number < 0 ||
card->number >= ARRAY_SIZE(snd_ctl_led_card_valid)))
return;
- mutex_lock(&snd_ctl_led_mutex);
- snd_ctl_led_card_valid[card->number] = true;
- mutex_unlock(&snd_ctl_led_mutex);
+ scoped_guard(mutex, &snd_ctl_led_mutex)
+ snd_ctl_led_card_valid[card->number] = true;
/* the register callback is already called with held card->controls_rwsem */
list_for_each_entry(kctl, &card->controls, list)
for (ioff = 0; ioff < kctl->count; ioff++)
@@ -367,10 +351,10 @@ static void snd_ctl_led_register(struct snd_card *card)
static void snd_ctl_led_disconnect(struct snd_card *card)
{
snd_ctl_led_sysfs_remove(card);
- mutex_lock(&snd_ctl_led_mutex);
- snd_ctl_led_card_valid[card->number] = false;
- snd_ctl_led_clean(card);
- mutex_unlock(&snd_ctl_led_mutex);
+ scoped_guard(mutex, &snd_ctl_led_mutex) {
+ snd_ctl_led_card_valid[card->number] = false;
+ snd_ctl_led_clean(card);
+ }
snd_ctl_led_refresh();
}
@@ -430,9 +414,8 @@ static ssize_t mode_store(struct device *dev,
else
return count;
- mutex_lock(&snd_ctl_led_mutex);
- led->mode = mode;
- mutex_unlock(&snd_ctl_led_mutex);
+ scoped_guard(mutex, &snd_ctl_led_mutex)
+ led->mode = mode;
snd_ctl_led_set_state(NULL, group_to_access(led->group), NULL, 0);
return count;
@@ -615,15 +598,15 @@ static ssize_t list_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
- struct snd_card *card;
+ struct snd_card *card __free(snd_card_unref) = NULL;
struct snd_ctl_led_ctl *lctl;
size_t l = 0;
card = snd_card_ref(led_card->number);
if (!card)
return -ENXIO;
- down_read(&card->controls_rwsem);
- mutex_lock(&snd_ctl_led_mutex);
+ guard(rwsem_read)(&card->controls_rwsem);
+ guard(mutex)(&snd_ctl_led_mutex);
if (snd_ctl_led_card_valid[led_card->number]) {
list_for_each_entry(lctl, &led_card->led->controls, list) {
if (lctl->card != card)
@@ -634,9 +617,6 @@ static ssize_t list_show(struct device *dev,
lctl->kctl->id.numid + lctl->index_offset);
}
}
- mutex_unlock(&snd_ctl_led_mutex);
- up_read(&card->controls_rwsem);
- snd_card_unref(card);
return l;
}
--
2.35.3
^ permalink raw reply related [flat|nested] 25+ messages in thread
end of thread, other threads:[~2024-02-23 16:28 UTC | newest]
Thread overview: 25+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-02-23 16:27 [PATCH 00/24] Clean up locking with guard() in ALSA core Takashi Iwai
2024-02-23 16:27 ` [PATCH 01/24] ALSA: ump: Use guard() for locking Takashi Iwai
2024-02-23 16:27 ` [PATCH 02/24] ALSA: compress_offload: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 03/24] ALSA: timer: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 04/24] ALSA: hrtimer: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 05/24] ALSA: hwdep: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 06/24] ALSA: info: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 07/24] ALSA: mixer_oss: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 08/24] ALSA: control: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 09/24] ALSA: rawmidi: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 10/24] ALSA: jack: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 11/24] ALSA: core: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 12/24] ALSA: seq: fifo: " Takashi Iwai
2024-02-23 16:27 ` [PATCH 13/24] ALSA: seq: memory: " Takashi Iwai
2024-02-23 16:28 ` [PATCH 14/24] ALSA: seq: ports: " Takashi Iwai
2024-02-23 16:28 ` [PATCH 15/24] ALSA: seq: queue: " Takashi Iwai
2024-02-23 16:28 ` [PATCH 16/24] ALSA: seq: timer: " Takashi Iwai
2024-02-23 16:28 ` [PATCH 17/24] ALSA: seq: midi: " Takashi Iwai
2024-02-23 16:28 ` [PATCH 18/24] ALSA: seq: ump: " Takashi Iwai
2024-02-23 16:28 ` [PATCH 19/24] ALSA: seq: virmidi: " Takashi Iwai
2024-02-23 16:28 ` [PATCH 20/24] ALSA: seq: prioq: " Takashi Iwai
2024-02-23 16:28 ` [PATCH 21/24] ALSA: pcm: " Takashi Iwai
2024-02-23 16:28 ` [PATCH 22/24] ALSA: pcm: Use guard() for PCM stream locks Takashi Iwai
2024-02-23 16:28 ` [PATCH 23/24] ALSA: pcm: oss: Use guard() for setup Takashi Iwai
2024-02-23 16:28 ` [PATCH 24/24] ALSA: control_led: Use guard() for locking Takashi Iwai
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox