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authorTakashi Iwai <tiwai@suse.de>2019-05-08 15:01:24 +0200
committerTakashi Iwai <tiwai@suse.de>2019-05-08 15:31:24 +0200
commit7f84ff68be05ec7a5d2acf8fdc734fe5897af48f (patch)
treea420b1da64e5752da6dc74515867f29ddf75f12c
parent534420c6ff87d3052540f1fd346e0adcff440819 (diff)
ALSA: line6: toneport: Fix broken usage of timer for delayed execution
The line6 toneport driver has code for some delayed initialization, and this hits the kernel Oops because mutex and other sleepable functions are used in the timer callback. Fix the abuse by a delayed work instead so that everything works gracefully. Reported-by: syzbot+a07d0142e74fdd595cfb@syzkaller.appspotmail.com Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/usb/line6/toneport.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/sound/usb/line6/toneport.c b/sound/usb/line6/toneport.c
index 19bee725de00..325b07b98b3c 100644
--- a/sound/usb/line6/toneport.c
+++ b/sound/usb/line6/toneport.c
@@ -54,8 +54,8 @@ struct usb_line6_toneport {
/* Firmware version (x 100) */
u8 firmware_version;
- /* Timer for delayed PCM startup */
- struct timer_list timer;
+ /* Work for delayed PCM startup */
+ struct delayed_work pcm_work;
/* Device type */
enum line6_device_type type;
@@ -241,9 +241,10 @@ static int snd_toneport_source_put(struct snd_kcontrol *kcontrol,
return 1;
}
-static void toneport_start_pcm(struct timer_list *t)
+static void toneport_start_pcm(struct work_struct *work)
{
- struct usb_line6_toneport *toneport = from_timer(toneport, t, timer);
+ struct usb_line6_toneport *toneport =
+ container_of(work, struct usb_line6_toneport, pcm_work.work);
struct usb_line6 *line6 = &toneport->line6;
line6_pcm_acquire(line6->line6pcm, LINE6_STREAM_MONITOR, true);
@@ -393,7 +394,8 @@ static int toneport_setup(struct usb_line6_toneport *toneport)
if (toneport_has_led(toneport))
toneport_update_led(toneport);
- mod_timer(&toneport->timer, jiffies + TONEPORT_PCM_DELAY * HZ);
+ schedule_delayed_work(&toneport->pcm_work,
+ msecs_to_jiffies(TONEPORT_PCM_DELAY * 1000));
return 0;
}
@@ -405,7 +407,7 @@ static void line6_toneport_disconnect(struct usb_line6 *line6)
struct usb_line6_toneport *toneport =
(struct usb_line6_toneport *)line6;
- del_timer_sync(&toneport->timer);
+ cancel_delayed_work_sync(&toneport->pcm_work);
if (toneport_has_led(toneport))
toneport_remove_leds(toneport);
@@ -422,7 +424,7 @@ static int toneport_init(struct usb_line6 *line6,
struct usb_line6_toneport *toneport = (struct usb_line6_toneport *) line6;
toneport->type = id->driver_info;
- timer_setup(&toneport->timer, toneport_start_pcm, 0);
+ INIT_DELAYED_WORK(&toneport->pcm_work, toneport_start_pcm);
line6->disconnect = line6_toneport_disconnect;