[ALSA] Fix possible races in timer callbacks
Fix possible races in timer callbacks.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 74637ce..6aad411 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -662,12 +662,13 @@
struct snd_timer_instance *ti, *ts;
unsigned long resolution, ticks;
struct list_head *p, *q, *n, *ack_list_head;
+ unsigned long flags;
int use_tasklet = 0;
if (timer == NULL)
return;
- spin_lock(&timer->lock);
+ spin_lock_irqsave(&timer->lock, flags);
/* remember the current resolution */
if (timer->hw.c_resolution)
@@ -752,7 +753,7 @@
/* do we have any slow callbacks? */
use_tasklet = !list_empty(&timer->sack_list_head);
- spin_unlock(&timer->lock);
+ spin_unlock_irqrestore(&timer->lock, flags);
if (use_tasklet)
tasklet_hi_schedule(&timer->task_queue);