diff options
Diffstat (limited to 'include/sound/pcm.h')
| -rw-r--r-- | include/sound/pcm.h | 58 |
1 files changed, 46 insertions, 12 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 6f3e10ca0e32..bc79962f4aa6 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -365,6 +365,7 @@ struct snd_pcm_runtime { struct snd_pcm_group { /* keep linked substreams */ spinlock_t lock; + struct mutex mutex; struct list_head substreams; int count; }; @@ -460,6 +461,7 @@ struct snd_pcm { void (*private_free) (struct snd_pcm *pcm); struct device *dev; /* actual hw device this belongs to */ bool internal; /* pcm is for internal use only */ + bool nonatomic; /* whole PCM operations are in non-atomic context */ #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) struct snd_pcm_oss oss; #endif @@ -493,6 +495,7 @@ int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); */ extern rwlock_t snd_pcm_link_rwlock; +extern struct rw_semaphore snd_pcm_link_rwsem; int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); int snd_pcm_info_user(struct snd_pcm_substream *substream, @@ -539,38 +542,69 @@ static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) { - read_lock(&snd_pcm_link_rwlock); - spin_lock(&substream->self_group.lock); + if (substream->pcm->nonatomic) { + down_read(&snd_pcm_link_rwsem); + mutex_lock(&substream->self_group.mutex); + } else { + read_lock(&snd_pcm_link_rwlock); + spin_lock(&substream->self_group.lock); + } } static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) { - spin_unlock(&substream->self_group.lock); - read_unlock(&snd_pcm_link_rwlock); + if (substream->pcm->nonatomic) { + mutex_unlock(&substream->self_group.mutex); + up_read(&snd_pcm_link_rwsem); + } else { + spin_unlock(&substream->self_group.lock); + read_unlock(&snd_pcm_link_rwlock); + } } static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) { - read_lock_irq(&snd_pcm_link_rwlock); - spin_lock(&substream->self_group.lock); + if (substream->pcm->nonatomic) { + down_read(&snd_pcm_link_rwsem); + mutex_lock(&substream->self_group.mutex); + } else { + read_lock_irq(&snd_pcm_link_rwlock); + spin_lock(&substream->self_group.lock); + } } static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) { - spin_unlock(&substream->self_group.lock); - read_unlock_irq(&snd_pcm_link_rwlock); + if (substream->pcm->nonatomic) { + mutex_unlock(&substream->self_group.mutex); + up_read(&snd_pcm_link_rwsem); + } else { + spin_unlock(&substream->self_group.lock); + read_unlock_irq(&snd_pcm_link_rwlock); + } } #define snd_pcm_stream_lock_irqsave(substream, flags) \ do { \ - read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ - spin_lock(&substream->self_group.lock); \ + if ((substream)->pcm->nonatomic) { \ + (flags) = 0; /* XXX for avoid warning */ \ + down_read(&snd_pcm_link_rwsem); \ + mutex_lock(&(substream)->self_group.mutex); \ + } else { \ + read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ + spin_lock(&(substream)->self_group.lock); \ + } \ } while (0) #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ do { \ - spin_unlock(&substream->self_group.lock); \ - read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ + if ((substream)->pcm->nonatomic) { \ + mutex_unlock(&(substream)->self_group.mutex); \ + up_read(&snd_pcm_link_rwsem); \ + } else { \ + spin_unlock(&(substream)->self_group.lock); \ + read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ + } \ } while (0) #define snd_pcm_group_for_each_entry(s, substream) \ |