Commit 73365cb1 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

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: default avatarTakashi Iwai <tiwai@suse.de>
parent d819fb21

sound/core/pcm.c

+1 −3
Original line number Diff line number Diff line
@@ -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;

sound/core/pcm_local.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

sound/core/pcm_native.c

+9 −4
Original line number Diff line number Diff line
@@ -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;

	}

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