* [PATCH 2/3] ALSA: hda - Fix possible races in HDMI driver
2013-10-17 16:32 [PATCH 1/3] ALSA: hda - Treat zero connection as non-error Takashi Iwai
@ 2013-10-17 16:32 ` Takashi Iwai
2013-10-17 16:32 ` [PATCH 3/3] ALSA: hda - Move mutex from hda_eld to per_pin in HDMI codec driver Takashi Iwai
2013-10-17 17:03 ` [PATCH 1/3] ALSA: hda - Treat zero connection as non-error David Henningsson
2 siblings, 0 replies; 5+ messages in thread
From: Takashi Iwai @ 2013-10-17 16:32 UTC (permalink / raw)
To: alsa-devel
Some per_pin fields and ELD contents might be changed dynamically in
multiple ways where the concurrent accesses are still opened in the
current code. This patch fixes such possible races by using eld->lock
in appropriate places.
Reported-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/pci/hda/patch_hdmi.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index b899eba..c2bad95 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1342,6 +1342,7 @@ static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
bool update_eld = false;
bool eld_changed = false;
+ mutex_lock(&pin_eld->lock);
pin_eld->monitor_present = !!(present & AC_PINSENSE_PRESENCE);
if (pin_eld->monitor_present)
eld->eld_valid = !!(present & AC_PINSENSE_ELDV);
@@ -1371,11 +1372,10 @@ static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
queue_delayed_work(codec->bus->workq,
&per_pin->work,
msecs_to_jiffies(300));
- return;
+ goto unlock;
}
}
- mutex_lock(&pin_eld->lock);
if (pin_eld->eld_valid && !eld->eld_valid) {
update_eld = true;
eld_changed = true;
@@ -1400,12 +1400,13 @@ static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
hdmi_setup_audio_infoframe(codec, per_pin,
per_pin->non_pcm);
}
- mutex_unlock(&pin_eld->lock);
if (eld_changed)
snd_ctl_notify(codec->bus->card,
SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
&per_pin->eld_ctl->id);
+ unlock:
+ mutex_unlock(&pin_eld->lock);
}
static void hdmi_repoll_eld(struct work_struct *work)
@@ -1576,10 +1577,12 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
bool non_pcm;
non_pcm = check_non_pcm_per_cvt(codec, cvt_nid);
+ mutex_lock(&per_pin->sink_eld.lock);
per_pin->channels = substream->runtime->channels;
per_pin->setup = true;
hdmi_setup_audio_infoframe(codec, per_pin, non_pcm);
+ mutex_unlock(&per_pin->sink_eld.lock);
return hdmi_setup_stream(codec, cvt_nid, pin_nid, stream_tag, format);
}
@@ -1617,11 +1620,14 @@ static int hdmi_pcm_close(struct hda_pcm_stream *hinfo,
per_pin = get_pin(spec, pin_idx);
snd_hda_spdif_ctls_unassign(codec, pin_idx);
+
+ mutex_lock(&per_pin->sink_eld.lock);
per_pin->chmap_set = false;
memset(per_pin->chmap, 0, sizeof(per_pin->chmap));
per_pin->setup = false;
per_pin->channels = 0;
+ mutex_unlock(&per_pin->sink_eld.lock);
}
return 0;
@@ -1750,10 +1756,12 @@ static int hdmi_chmap_ctl_put(struct snd_kcontrol *kcontrol,
ca = hdmi_manual_channel_allocation(ARRAY_SIZE(chmap), chmap);
if (ca < 0)
return -EINVAL;
+ mutex_lock(&per_pin->sink_eld.lock);
per_pin->chmap_set = true;
memcpy(per_pin->chmap, chmap, sizeof(chmap));
if (prepared)
hdmi_setup_audio_infoframe(codec, per_pin, per_pin->non_pcm);
+ mutex_unlock(&per_pin->sink_eld.lock);
return 0;
}
--
1.8.4
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 3/3] ALSA: hda - Move mutex from hda_eld to per_pin in HDMI codec driver
2013-10-17 16:32 [PATCH 1/3] ALSA: hda - Treat zero connection as non-error Takashi Iwai
2013-10-17 16:32 ` [PATCH 2/3] ALSA: hda - Fix possible races in HDMI driver Takashi Iwai
@ 2013-10-17 16:32 ` Takashi Iwai
2013-10-17 17:03 ` [PATCH 1/3] ALSA: hda - Treat zero connection as non-error David Henningsson
2 siblings, 0 replies; 5+ messages in thread
From: Takashi Iwai @ 2013-10-17 16:32 UTC (permalink / raw)
To: alsa-devel
Since the lock is used primarily in patch_hdmi.c, it's better to move
it in the local struct instead of exporting in hda_eld. The only
functions requiring the lock in hda_eld.c are proc accessors. So in
this patch, the proc entry and its creation/deletion/accessors are
moved into patch_hdmi.c, together with the mutex lock to pin_spec
struct.
The former proc info functions are exported so that they can be called
from patch_hdmi.c.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/pci/hda/hda_eld.c | 48 +++-----------------
sound/pci/hda/hda_local.h | 22 ++-------
sound/pci/hda/patch_hdmi.c | 108 ++++++++++++++++++++++++++++++++++++---------
3 files changed, 97 insertions(+), 81 deletions(-)
diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
index d0d7ac1..f62356c 100644
--- a/sound/pci/hda/hda_eld.c
+++ b/sound/pci/hda/hda_eld.c
@@ -478,10 +478,9 @@ static void hdmi_print_sad_info(int i, struct cea_sad *a,
snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
}
-static void hdmi_print_eld_info(struct snd_info_entry *entry,
- struct snd_info_buffer *buffer)
+void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
+ struct snd_info_buffer *buffer)
{
- struct hdmi_eld *eld = entry->private_data;
struct parsed_hdmi_eld *e = &eld->info;
char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
int i;
@@ -500,13 +499,10 @@ static void hdmi_print_eld_info(struct snd_info_entry *entry,
[4 ... 7] = "reserved"
};
- mutex_lock(&eld->lock);
snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
- if (!eld->eld_valid) {
- mutex_unlock(&eld->lock);
+ if (!eld->eld_valid)
return;
- }
snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
snd_iprintf(buffer, "connection_type\t\t%s\n",
eld_connection_type_names[e->conn_type]);
@@ -528,13 +524,11 @@ static void hdmi_print_eld_info(struct snd_info_entry *entry,
for (i = 0; i < e->sad_count; i++)
hdmi_print_sad_info(i, e->sad + i, buffer);
- mutex_unlock(&eld->lock);
}
-static void hdmi_write_eld_info(struct snd_info_entry *entry,
- struct snd_info_buffer *buffer)
+void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
+ struct snd_info_buffer *buffer)
{
- struct hdmi_eld *eld = entry->private_data;
struct parsed_hdmi_eld *e = &eld->info;
char line[64];
char name[64];
@@ -542,7 +536,6 @@ static void hdmi_write_eld_info(struct snd_info_entry *entry,
long long val;
unsigned int n;
- mutex_lock(&eld->lock);
while (!snd_info_get_line(buffer, line, sizeof(line))) {
if (sscanf(line, "%s %llx", name, &val) != 2)
continue;
@@ -594,38 +587,7 @@ static void hdmi_write_eld_info(struct snd_info_entry *entry,
e->sad_count = n + 1;
}
}
- mutex_unlock(&eld->lock);
-}
-
-
-int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
- int index)
-{
- char name[32];
- struct snd_info_entry *entry;
- int err;
-
- snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
- err = snd_card_proc_new(codec->bus->card, name, &entry);
- if (err < 0)
- return err;
-
- snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
- entry->c.text.write = hdmi_write_eld_info;
- entry->mode |= S_IWUSR;
- eld->proc_entry = entry;
-
- return 0;
-}
-
-void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
-{
- if (!codec->bus->shutdown && eld->proc_entry) {
- snd_device_free(codec->bus->card, eld->proc_entry);
- eld->proc_entry = NULL;
- }
}
-
#endif /* CONFIG_PROC_FS */
/* update PCM info based on ELD */
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index a71bf34..46cddd4 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -752,10 +752,6 @@ struct hdmi_eld {
int eld_size;
char eld_buffer[ELD_MAX_SIZE];
struct parsed_hdmi_eld info;
- struct mutex lock;
-#ifdef CONFIG_PROC_FS
- struct snd_info_entry *proc_entry;
-#endif
};
int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid);
@@ -768,20 +764,10 @@ void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
struct hda_pcm_stream *hinfo);
#ifdef CONFIG_PROC_FS
-int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
- int index);
-void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld);
-#else
-static inline int snd_hda_eld_proc_new(struct hda_codec *codec,
- struct hdmi_eld *eld,
- int index)
-{
- return 0;
-}
-static inline void snd_hda_eld_proc_free(struct hda_codec *codec,
- struct hdmi_eld *eld)
-{
-}
+void snd_hdmi_print_eld_info(struct hdmi_eld *eld,
+ struct snd_info_buffer *buffer);
+void snd_hdmi_write_eld_info(struct hdmi_eld *eld,
+ struct snd_info_buffer *buffer);
#endif
#define SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE 80
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index c2bad95..804adb8 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -67,6 +67,7 @@ struct hdmi_spec_per_pin {
struct hda_codec *codec;
struct hdmi_eld sink_eld;
+ struct mutex lock;
struct delayed_work work;
struct snd_kcontrol *eld_ctl;
int repoll_count;
@@ -76,6 +77,9 @@ struct hdmi_spec_per_pin {
bool chmap_set; /* channel-map override by ALSA API? */
unsigned char chmap[8]; /* ALSA API channel-map */
char pcm_name[8]; /* filled in build_pcm callbacks */
+#ifdef CONFIG_PROC_FS
+ struct snd_info_entry *proc_entry;
+#endif
};
struct hdmi_spec {
@@ -349,17 +353,19 @@ static int hdmi_eld_ctl_info(struct snd_kcontrol *kcontrol,
{
struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
struct hdmi_spec *spec = codec->spec;
+ struct hdmi_spec_per_pin *per_pin;
struct hdmi_eld *eld;
int pin_idx;
uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
pin_idx = kcontrol->private_value;
- eld = &get_pin(spec, pin_idx)->sink_eld;
+ per_pin = get_pin(spec, pin_idx);
+ eld = &per_pin->sink_eld;
- mutex_lock(&eld->lock);
+ mutex_lock(&per_pin->lock);
uinfo->count = eld->eld_valid ? eld->eld_size : 0;
- mutex_unlock(&eld->lock);
+ mutex_unlock(&per_pin->lock);
return 0;
}
@@ -369,15 +375,17 @@ static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol,
{
struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
struct hdmi_spec *spec = codec->spec;
+ struct hdmi_spec_per_pin *per_pin;
struct hdmi_eld *eld;
int pin_idx;
pin_idx = kcontrol->private_value;
- eld = &get_pin(spec, pin_idx)->sink_eld;
+ per_pin = get_pin(spec, pin_idx);
+ eld = &per_pin->sink_eld;
- mutex_lock(&eld->lock);
+ mutex_lock(&per_pin->lock);
if (eld->eld_size > ARRAY_SIZE(ucontrol->value.bytes.data)) {
- mutex_unlock(&eld->lock);
+ mutex_unlock(&per_pin->lock);
snd_BUG();
return -EINVAL;
}
@@ -387,7 +395,7 @@ static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol,
if (eld->eld_valid)
memcpy(ucontrol->value.bytes.data, eld->eld_buffer,
eld->eld_size);
- mutex_unlock(&eld->lock);
+ mutex_unlock(&per_pin->lock);
return 0;
}
@@ -478,6 +486,68 @@ static void hdmi_set_channel_count(struct hda_codec *codec,
AC_VERB_SET_CVT_CHAN_COUNT, chs - 1);
}
+/*
+ * ELD proc files
+ */
+
+#ifdef CONFIG_PROC_FS
+static void print_eld_info(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ struct hdmi_spec_per_pin *per_pin = entry->private_data;
+
+ mutex_lock(&per_pin->lock);
+ snd_hdmi_print_eld_info(&per_pin->sink_eld, buffer);
+ mutex_unlock(&per_pin->lock);
+}
+
+static void write_eld_info(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ struct hdmi_spec_per_pin *per_pin = entry->private_data;
+
+ mutex_lock(&per_pin->lock);
+ snd_hdmi_write_eld_info(&per_pin->sink_eld, buffer);
+ mutex_unlock(&per_pin->lock);
+}
+
+static int eld_proc_new(struct hdmi_spec_per_pin *per_pin, int index)
+{
+ char name[32];
+ struct hda_codec *codec = per_pin->codec;
+ struct snd_info_entry *entry;
+ int err;
+
+ snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
+ err = snd_card_proc_new(codec->bus->card, name, &entry);
+ if (err < 0)
+ return err;
+
+ snd_info_set_text_ops(entry, per_pin, print_eld_info);
+ entry->c.text.write = write_eld_info;
+ entry->mode |= S_IWUSR;
+ per_pin->proc_entry = entry;
+
+ return 0;
+}
+
+static void eld_proc_free(struct hdmi_spec_per_pin *per_pin)
+{
+ if (!per_pin->codec->bus->shutdown && per_pin->proc_entry) {
+ snd_device_free(per_pin->codec->bus->card, per_pin->proc_entry);
+ per_pin->proc_entry = NULL;
+ }
+}
+#else
+static inline int snd_hda_eld_proc_new(struct hdmi_spec_per_pin *per_pin,
+ int index)
+{
+ return 0;
+}
+static inline void snd_hda_eld_proc_free(struct hdmi_spec_per_pin *per_pin)
+{
+}
+#endif
/*
* Channel mapping routines
@@ -1342,7 +1412,7 @@ static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
bool update_eld = false;
bool eld_changed = false;
- mutex_lock(&pin_eld->lock);
+ mutex_lock(&per_pin->lock);
pin_eld->monitor_present = !!(present & AC_PINSENSE_PRESENCE);
if (pin_eld->monitor_present)
eld->eld_valid = !!(present & AC_PINSENSE_ELDV);
@@ -1406,7 +1476,7 @@ static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
&per_pin->eld_ctl->id);
unlock:
- mutex_unlock(&pin_eld->lock);
+ mutex_unlock(&per_pin->lock);
}
static void hdmi_repoll_eld(struct work_struct *work)
@@ -1577,12 +1647,12 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
bool non_pcm;
non_pcm = check_non_pcm_per_cvt(codec, cvt_nid);
- mutex_lock(&per_pin->sink_eld.lock);
+ mutex_lock(&per_pin->lock);
per_pin->channels = substream->runtime->channels;
per_pin->setup = true;
hdmi_setup_audio_infoframe(codec, per_pin, non_pcm);
- mutex_unlock(&per_pin->sink_eld.lock);
+ mutex_unlock(&per_pin->lock);
return hdmi_setup_stream(codec, cvt_nid, pin_nid, stream_tag, format);
}
@@ -1621,13 +1691,13 @@ static int hdmi_pcm_close(struct hda_pcm_stream *hinfo,
snd_hda_spdif_ctls_unassign(codec, pin_idx);
- mutex_lock(&per_pin->sink_eld.lock);
+ mutex_lock(&per_pin->lock);
per_pin->chmap_set = false;
memset(per_pin->chmap, 0, sizeof(per_pin->chmap));
per_pin->setup = false;
per_pin->channels = 0;
- mutex_unlock(&per_pin->sink_eld.lock);
+ mutex_unlock(&per_pin->lock);
}
return 0;
@@ -1756,12 +1826,12 @@ static int hdmi_chmap_ctl_put(struct snd_kcontrol *kcontrol,
ca = hdmi_manual_channel_allocation(ARRAY_SIZE(chmap), chmap);
if (ca < 0)
return -EINVAL;
- mutex_lock(&per_pin->sink_eld.lock);
+ mutex_lock(&per_pin->lock);
per_pin->chmap_set = true;
memcpy(per_pin->chmap, chmap, sizeof(chmap));
if (prepared)
hdmi_setup_audio_infoframe(codec, per_pin, per_pin->non_pcm);
- mutex_unlock(&per_pin->sink_eld.lock);
+ mutex_unlock(&per_pin->lock);
return 0;
}
@@ -1878,12 +1948,11 @@ static int generic_hdmi_init_per_pins(struct hda_codec *codec)
for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
- struct hdmi_eld *eld = &per_pin->sink_eld;
per_pin->codec = codec;
- mutex_init(&eld->lock);
+ mutex_init(&per_pin->lock);
INIT_DELAYED_WORK(&per_pin->work, hdmi_repoll_eld);
- snd_hda_eld_proc_new(codec, eld, pin_idx);
+ eld_proc_new(per_pin, pin_idx);
}
return 0;
}
@@ -1924,10 +1993,9 @@ static void generic_hdmi_free(struct hda_codec *codec)
for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
- struct hdmi_eld *eld = &per_pin->sink_eld;
cancel_delayed_work(&per_pin->work);
- snd_hda_eld_proc_free(codec, eld);
+ eld_proc_free(per_pin);
}
flush_workqueue(codec->bus->workq);
--
1.8.4
^ permalink raw reply related [flat|nested] 5+ messages in thread