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ALSA: timer: Make sure to clear pending ack list 

When a card is under disconnection, we bail out immediately at each
timer interrupt or tasklet.  This might leave some items left in ack
list.  For a better integration of the upcoming change to check
ack_list emptiness, clear out the whole list upon the emergency exit
route.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-03-27 16:51:58 +01:00
parent 8748b850be
commit 7bb4a8a2cc
1 changed files with 18 additions and 2 deletions
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20
sound/core/timer.c
View File

@ -747,6 +747,18 @@ static void snd_timer_process_callbacks(struct snd_timer *timer,
}
}
/* clear pending instances from ack list */
static void snd_timer_clear_callbacks(struct snd_timer *timer,
struct list_head *head)
{
unsigned long flags;
spin_lock_irqsave(&timer->lock, flags);
while (!list_empty(head))
list_del_init(head->next);
spin_unlock_irqrestore(&timer->lock, flags);
}
/*
* timer tasklet
*
@ -756,8 +768,10 @@ static void snd_timer_tasklet(unsigned long arg)
struct snd_timer *timer = (struct snd_timer *) arg;
unsigned long flags;
if (timer->card && timer->card->shutdown)
if (timer->card && timer->card->shutdown) {
snd_timer_clear_callbacks(timer, &timer->sack_list_head);
return;
}
spin_lock_irqsave(&timer->lock, flags);
snd_timer_process_callbacks(timer, &timer->sack_list_head);
@ -781,8 +795,10 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
if (timer == NULL)
return;
if (timer->card && timer->card->shutdown)
if (timer->card && timer->card->shutdown) {
snd_timer_clear_callbacks(timer, &timer->ack_list_head);
return;
}
spin_lock_irqsave(&timer->lock, flags);