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Commit a7588c89 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: timer: Check ack_list emptiness instead of bit flag 



For checking the pending timer instance that is still left on the
timer object that is being closed, we set/clear a bit flag
SNDRV_TIMER_IFLG_CALLBACK around the call of callbacks.  This can be
simplified by replace with the list_empty() call for ti->ack_list.
This covers the existence more comprehensively and safely.

A gratis bonus is that we can get rid of SNDRV_TIMER_IFLG_CALLBACK bit
flag definition as well.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 7bb4a8a2

include/sound/timer.h

+0 −1
Original line number Diff line number Diff line
@@ -43,7 +43,6 @@ 
#define SNDRV_TIMER_IFLG_START	  0x00000004

#define SNDRV_TIMER_IFLG_AUTO	  0x00000008	/* auto restart */

#define SNDRV_TIMER_IFLG_FAST	  0x00000010	/* fast callback (do not use tasklet) */

#define SNDRV_TIMER_IFLG_CALLBACK 0x00000020	/* timer callback is active */

#define SNDRV_TIMER_IFLG_EXCLUSIVE 0x00000040	/* exclusive owner - no more instances */

#define SNDRV_TIMER_IFLG_EARLY_EVENT 0x00000080	/* write early event to the poll queue */

sound/core/timer.c

+4 −6
Original line number Diff line number Diff line
@@ -366,7 +366,7 @@ static int snd_timer_close_locked(struct snd_timer_instance *timeri) 
		timer->num_instances--;

		/* wait, until the active callback is finished */

		spin_lock_irq(&timer->lock);

		while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {

		while (!list_empty(&timeri->ack_list)) {

			spin_unlock_irq(&timer->lock);

			udelay(10);

			spin_lock_irq(&timer->lock);
@@ -731,19 +731,17 @@ static void snd_timer_process_callbacks(struct snd_timer *timer, 
		ti = list_first_entry(head, struct snd_timer_instance,

				      ack_list);



		/* remove from ack_list and make empty */

		list_del_init(&ti->ack_list);



		ticks = ti->pticks;

		ti->pticks = 0;

		resolution = ti->resolution;



		ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;

		spin_unlock(&timer->lock);

		if (ti->callback)

			ti->callback(ti, resolution, ticks);

		spin_lock(&timer->lock);

		ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;



		/* remove from ack_list and make empty */

		list_del_init(&ti->ack_list);

	}

}