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ALSA: pcm: Unify snd_pcm_group initialization 

There are multiple open codes that initialize the same object.
Create a common helper function instead.

Also, use kzalloc() to be safer at creating a group object, and move
the initialization out of the critical section.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-01-13 09:35:17 +01:00
parent d819fb21ee
commit 73365cb10b
3 changed files with 11 additions and 7 deletions
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4
sound/core/pcm.c
View File

@ -753,9 +753,7 @@ int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
}
}
substream->group = &substream->self_group;
spin_lock_init(&substream->self_group.lock);
mutex_init(&substream->self_group.mutex);
INIT_LIST_HEAD(&substream->self_group.substreams);
snd_pcm_group_init(&substream->self_group);
list_add_tail(&substream->link_list, &substream->self_group.substreams);
atomic_set(&substream->mmap_count, 0);
prev = substream;

1
sound/core/pcm_local.h
View File

@ -66,5 +66,6 @@ static inline void snd_pcm_timer_done(struct snd_pcm_substream *substream) {}
#endif
void __snd_pcm_xrun(struct snd_pcm_substream *substream);
void snd_pcm_group_init(struct snd_pcm_group *group);
#endif /* __SOUND_CORE_PCM_LOCAL_H */

13
sound/core/pcm_native.c
View File

@ -100,6 +100,13 @@ static inline void down_write_nonfifo(struct rw_semaphore *lock)
msleep(1);
}
void snd_pcm_group_init(struct snd_pcm_group *group)
{
spin_lock_init(&group->lock);
mutex_init(&group->mutex);
INIT_LIST_HEAD(&group->substreams);
}
#define PCM_LOCK_DEFAULT 0
#define PCM_LOCK_IRQ 1
#define PCM_LOCK_IRQSAVE 2
@ -1969,11 +1976,12 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
}
pcm_file = f.file->private_data;
substream1 = pcm_file->substream;
group = kmalloc(sizeof(*group), GFP_KERNEL);
group = kzalloc(sizeof(*group), GFP_KERNEL);
if (!group) {
res = -ENOMEM;
goto _nolock;
}
snd_pcm_group_init(group);
down_write_nonfifo(&snd_pcm_link_rwsem);
write_lock_irq(&snd_pcm_link_rwlock);
if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
@ -1989,9 +1997,6 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
if (!snd_pcm_stream_linked(substream)) {
substream->group = group;
group = NULL;
spin_lock_init(&substream->group->lock);
mutex_init(&substream->group->mutex);
INIT_LIST_HEAD(&substream->group->substreams);
list_add_tail(&substream->link_list, &substream->group->substreams);
substream->group->count = 1;
}