[PATCH] ALSA: usb-audio: Convert timers to use timer_setup()

[Kees Cook <keescook@chromium.org>]

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: Andrej Krutak <dev@andree.sk>
Cc: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: "Hans P. Möller Ebner" <hmoller@uc.cl>
Cc: Bhumika Goyal <bhumirks@gmail.com>
Cc: alsa-devel@alsa-project.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 sound/usb/line6/driver.c   |  4 ++--
 sound/usb/line6/driver.h   |  3 +--
 sound/usb/line6/pod.c      | 11 +++++------
 sound/usb/line6/podhd.c    | 10 +++++-----
 sound/usb/line6/toneport.c |  7 +++----
 sound/usb/line6/variax.c   | 32 ++++++++++++++++----------------
 sound/usb/midi.c           |  7 +++----
 7 files changed, 35 insertions(+), 39 deletions(-)

diff --git a/sound/usb/line6/driver.c b/sound/usb/line6/driver.c
index 8d5a454842f4..4f9613e5fc9e 100644
--- a/sound/usb/line6/driver.c
+++ b/sound/usb/line6/driver.c
@@ -199,9 +199,9 @@ static int line6_send_raw_message_async_part(struct message *msg,
 	Setup and start timer.
 */
 void line6_start_timer(struct timer_list *timer, unsigned long msecs,
-		       void (*function)(unsigned long), unsigned long data)
+		       void (*function)(struct timer_list *t))
 {
-	setup_timer(timer, function, data);
+	timer->function = (TIMER_FUNC_TYPE)function;
 	mod_timer(timer, jiffies + msecs_to_jiffies(msecs));
 }
 EXPORT_SYMBOL_GPL(line6_start_timer);
diff --git a/sound/usb/line6/driver.h b/sound/usb/line6/driver.h
index dc97895547be..61425597eb61 100644
--- a/sound/usb/line6/driver.h
+++ b/sound/usb/line6/driver.h
@@ -198,8 +198,7 @@ extern int line6_send_sysex_message(struct usb_line6 *line6,
 extern ssize_t line6_set_raw(struct device *dev, struct device_attribute *attr,
 			     const char *buf, size_t count);
 extern void line6_start_timer(struct timer_list *timer, unsigned long msecs,
-			      void (*function)(unsigned long),
-			      unsigned long data);
+			      void (*function)(struct timer_list *t));
 extern int line6_version_request_async(struct usb_line6 *line6);
 extern int line6_write_data(struct usb_line6 *line6, unsigned address,
 			    void *data, unsigned datalen);
diff --git a/sound/usb/line6/pod.c b/sound/usb/line6/pod.c
index 358224cc5638..020c81818951 100644
--- a/sound/usb/line6/pod.c
+++ b/sound/usb/line6/pod.c
@@ -174,7 +174,7 @@ static const char pod_version_header[] = {
 };
 
 /* forward declarations: */
-static void pod_startup2(unsigned long data);
+static void pod_startup2(struct timer_list *t);
 static void pod_startup3(struct usb_line6_pod *pod);
 
 static char *pod_alloc_sysex_buffer(struct usb_line6_pod *pod, int code,
@@ -286,13 +286,12 @@ static void pod_startup1(struct usb_line6_pod *pod)
 	CHECK_STARTUP_PROGRESS(pod->startup_progress, POD_STARTUP_INIT);
 
 	/* delay startup procedure: */
-	line6_start_timer(&pod->startup_timer, POD_STARTUP_DELAY, pod_startup2,
-			  (unsigned long)pod);
+	line6_start_timer(&pod->startup_timer, POD_STARTUP_DELAY, pod_startup2);
 }
 
-static void pod_startup2(unsigned long data)
+static void pod_startup2(struct timer_list *t)
 {
-	struct usb_line6_pod *pod = (struct usb_line6_pod *)data;
+	struct usb_line6_pod *pod = from_timer(pod, t, startup_timer);
 	struct usb_line6 *line6 = &pod->line6;
 
 	CHECK_STARTUP_PROGRESS(pod->startup_progress, POD_STARTUP_VERSIONREQ);
@@ -413,7 +412,7 @@ static int pod_init(struct usb_line6 *line6,
 	line6->process_message = line6_pod_process_message;
 	line6->disconnect = line6_pod_disconnect;
 
-	init_timer(&pod->startup_timer);
+	timer_setup(&pod->startup_timer, NULL, 0);
 	INIT_WORK(&pod->startup_work, pod_startup4);
 
 	/* create sysfs entries: */
diff --git a/sound/usb/line6/podhd.c b/sound/usb/line6/podhd.c
index 46fa8c046cb5..36ed9c85c0eb 100644
--- a/sound/usb/line6/podhd.c
+++ b/sound/usb/line6/podhd.c
@@ -158,7 +158,7 @@ static struct line6_pcm_properties podx3_pcm_properties = {
 };
 static struct usb_driver podhd_driver;
 
-static void podhd_startup_start_workqueue(unsigned long data);
+static void podhd_startup_start_workqueue(struct timer_list *t);
 static void podhd_startup_workqueue(struct work_struct *work);
 static int podhd_startup_finalize(struct usb_line6_podhd *pod);
 
@@ -208,12 +208,12 @@ static void podhd_startup(struct usb_line6_podhd *pod)
 
 	/* delay startup procedure: */
 	line6_start_timer(&pod->startup_timer, PODHD_STARTUP_DELAY,
-		podhd_startup_start_workqueue, (unsigned long)pod);
+		podhd_startup_start_workqueue);
 }
 
-static void podhd_startup_start_workqueue(unsigned long data)
+static void podhd_startup_start_workqueue(struct timer_list *t)
 {
-	struct usb_line6_podhd *pod = (struct usb_line6_podhd *)data;
+	struct usb_line6_podhd *pod = from_timer(pod, t, startup_timer);
 
 	CHECK_STARTUP_PROGRESS(pod->startup_progress,
 		PODHD_STARTUP_SCHEDULE_WORKQUEUE);
@@ -319,7 +319,7 @@ static int podhd_init(struct usb_line6 *line6,
 
 	line6->disconnect = podhd_disconnect;
 
-	init_timer(&pod->startup_timer);
+	timer_setup(&pod->startup_timer, NULL, 0);
 	INIT_WORK(&pod->startup_work, podhd_startup_workqueue);
 
 	if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL) {
diff --git a/sound/usb/line6/toneport.c b/sound/usb/line6/toneport.c
index ba7975c0d03d..750467fb95db 100644
--- a/sound/usb/line6/toneport.c
+++ b/sound/usb/line6/toneport.c
@@ -241,9 +241,9 @@ static int snd_toneport_source_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static void toneport_start_pcm(unsigned long arg)
+static void toneport_start_pcm(struct timer_list *t)
 {
-	struct usb_line6_toneport *toneport = (struct usb_line6_toneport *)arg;
+	struct usb_line6_toneport *toneport = from_timer(toneport, t, timer);
 	struct usb_line6 *line6 = &toneport->line6;
 
 	line6_pcm_acquire(line6->line6pcm, LINE6_STREAM_MONITOR, true);
@@ -415,8 +415,7 @@ static int toneport_init(struct usb_line6 *line6,
 	struct usb_line6_toneport *toneport =  (struct usb_line6_toneport *) line6;
 
 	toneport->type = id->driver_info;
-	setup_timer(&toneport->timer, toneport_start_pcm,
-		    (unsigned long)toneport);
+	timer_setup(&toneport->timer, toneport_start_pcm, 0);
 
 	line6->disconnect = line6_toneport_disconnect;
 
diff --git a/sound/usb/line6/variax.c b/sound/usb/line6/variax.c
index 0c4512d0382e..e8c852b2ce35 100644
--- a/sound/usb/line6/variax.c
+++ b/sound/usb/line6/variax.c
@@ -82,9 +82,9 @@ static const char variax_activate[] = {
 };
 
 /* forward declarations: */
-static void variax_startup2(unsigned long data);
-static void variax_startup4(unsigned long data);
-static void variax_startup5(unsigned long data);
+static void variax_startup2(struct timer_list *t);
+static void variax_startup4(struct timer_list *t);
+static void variax_startup5(struct timer_list *t);
 
 static void variax_activate_async(struct usb_line6_variax *variax, int a)
 {
@@ -106,12 +106,12 @@ static void variax_startup1(struct usb_line6_variax *variax)
 
 	/* delay startup procedure: */
 	line6_start_timer(&variax->startup_timer1, VARIAX_STARTUP_DELAY1,
-			  variax_startup2, (unsigned long)variax);
+			  variax_startup2);
 }
 
-static void variax_startup2(unsigned long data)
+static void variax_startup2(struct timer_list *t)
 {
-	struct usb_line6_variax *variax = (struct usb_line6_variax *)data;
+	struct usb_line6_variax *variax = from_timer(variax, t, startup_timer1);
 	struct usb_line6 *line6 = &variax->line6;
 
 	/* schedule another startup procedure until startup is complete: */
@@ -120,7 +120,7 @@ static void variax_startup2(unsigned long data)
 
 	variax->startup_progress = VARIAX_STARTUP_VERSIONREQ;
 	line6_start_timer(&variax->startup_timer1, VARIAX_STARTUP_DELAY1,
-			  variax_startup2, (unsigned long)variax);
+			  variax_startup2);
 
 	/* request firmware version: */
 	line6_version_request_async(line6);
@@ -132,12 +132,12 @@ static void variax_startup3(struct usb_line6_variax *variax)
 
 	/* delay startup procedure: */
 	line6_start_timer(&variax->startup_timer2, VARIAX_STARTUP_DELAY3,
-			  variax_startup4, (unsigned long)variax);
+			  variax_startup4);
 }
 
-static void variax_startup4(unsigned long data)
+static void variax_startup4(struct timer_list *t)
 {
-	struct usb_line6_variax *variax = (struct usb_line6_variax *)data;
+	struct usb_line6_variax *variax = from_timer(variax, t, startup_timer2);
 
 	CHECK_STARTUP_PROGRESS(variax->startup_progress,
 			       VARIAX_STARTUP_ACTIVATE);
@@ -145,12 +145,12 @@ static void variax_startup4(unsigned long data)
 	/* activate device: */
 	variax_activate_async(variax, 1);
 	line6_start_timer(&variax->startup_timer2, VARIAX_STARTUP_DELAY4,
-			  variax_startup5, (unsigned long)variax);
+			  variax_startup5);
 }
 
-static void variax_startup5(unsigned long data)
+static void variax_startup5(struct timer_list *t)
 {
-	struct usb_line6_variax *variax = (struct usb_line6_variax *)data;
+	struct usb_line6_variax *variax = from_timer(variax, t, startup_timer2);
 
 	CHECK_STARTUP_PROGRESS(variax->startup_progress,
 			       VARIAX_STARTUP_WORKQUEUE);
@@ -190,7 +190,7 @@ static void line6_variax_process_message(struct usb_line6 *line6)
 		} else if (memcmp(buf + 1, variax_init_done + 1,
 				  sizeof(variax_init_done) - 1) == 0) {
 			/* notify of complete initialization: */
-			variax_startup4((unsigned long)variax);
+			variax_startup4(&variax->startup_timer2);
 		}
 		break;
 	}
@@ -222,8 +222,8 @@ static int variax_init(struct usb_line6 *line6,
 	line6->process_message = line6_variax_process_message;
 	line6->disconnect = line6_variax_disconnect;
 
-	init_timer(&variax->startup_timer1);
-	init_timer(&variax->startup_timer2);
+	timer_setup(&variax->startup_timer1, NULL, 0);
+	timer_setup(&variax->startup_timer2, NULL, 0);
 	INIT_WORK(&variax->startup_work, variax_startup6);
 
 	/* initialize USB buffers: */
diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index 7ab25de5ca0a..2c1aaa3292bf 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -352,9 +352,9 @@ static void snd_usbmidi_out_tasklet(unsigned long data)
 }
 
 /* called after transfers had been interrupted due to some USB error */
-static void snd_usbmidi_error_timer(unsigned long data)
+static void snd_usbmidi_error_timer(struct timer_list *t)
 {
-	struct snd_usb_midi *umidi = (struct snd_usb_midi *)data;
+	struct snd_usb_midi *umidi = from_timer(umidi, t, error_timer);
 	unsigned int i, j;
 
 	spin_lock(&umidi->disc_lock);
@@ -2369,8 +2369,7 @@ int __snd_usbmidi_create(struct snd_card *card,
 		usb_id = USB_ID(le16_to_cpu(umidi->dev->descriptor.idVendor),
 			       le16_to_cpu(umidi->dev->descriptor.idProduct));
 	umidi->usb_id = usb_id;
-	setup_timer(&umidi->error_timer, snd_usbmidi_error_timer,
-		    (unsigned long)umidi);
+	timer_setup(&umidi->error_timer, snd_usbmidi_error_timer, 0);
 
 	/* detect the endpoint(s) to use */
 	memset(endpoints, 0, sizeof(endpoints));
-- 
2.7.4


-- 
Kees Cook
Pixel Security