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ALSA: Remove unneeded snd_pcm_substream.timer_lock 

The timer callbacks are called in the protected status by the lock
of the timer instance, so there is no need for an extra lock in the
PCM substream.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-03-06 16:30:07 +01:00
parent ed3da3d9a0
commit 85122ea40c
3 changed files with 0 additions and 8 deletions
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1
include/sound/pcm.h
View File

@ -364,7 +364,6 @@ struct snd_pcm_substream {
/* -- timer section -- */
struct snd_timer *timer; /* timer */
unsigned timer_running: 1; /* time is running */
spinlock_t timer_lock;
/* -- next substream -- */
struct snd_pcm_substream *next;
/* -- linked substreams -- */

1
sound/core/pcm.c
View File

@ -667,7 +667,6 @@ int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
spin_lock_init(&substream->self_group.lock);
INIT_LIST_HEAD(&substream->self_group.substreams);
list_add_tail(&substream->link_list, &substream->self_group.substreams);
spin_lock_init(&substream->timer_lock);
atomic_set(&substream->mmap_count, 0);
prev = substream;
}

6
sound/core/pcm_timer.c
View File

@ -85,25 +85,19 @@ static unsigned long snd_pcm_timer_resolution(struct snd_timer * timer)
static int snd_pcm_timer_start(struct snd_timer * timer)
{
unsigned long flags;
struct snd_pcm_substream *substream;
substream = snd_timer_chip(timer);
spin_lock_irqsave(&substream->timer_lock, flags);
substream->timer_running = 1;
spin_unlock_irqrestore(&substream->timer_lock, flags);
return 0;
}
static int snd_pcm_timer_stop(struct snd_timer * timer)
{
unsigned long flags;
struct snd_pcm_substream *substream;
substream = snd_timer_chip(timer);
spin_lock_irqsave(&substream->timer_lock, flags);
substream->timer_running = 0;
spin_unlock_irqrestore(&substream->timer_lock, flags);
return 0;
}