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| author | Takashi Iwai <tiwai@suse.de> | 2024-02-27 09:53:03 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2024-02-28 15:01:22 +0100 |
| commit | dd0da75b9a2768710366a599c9bd70058e67e2ea (patch) | |
| tree | 60fc384a555d4ef4cc1be7e7c559f5093f2cc0e9 /sound/core/pcm_memory.c | |
| parent | 1affe7bb50c9bda4d4ada1ecab90ce6d27e77b00 (diff) | |
| download | lwn-dd0da75b9a2768710366a599c9bd70058e67e2ea.tar.gz lwn-dd0da75b9a2768710366a599c9bd70058e67e2ea.zip | |
ALSA: pcm: Use guard() for locking
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240227085306.9764-22-tiwai@suse.de
Diffstat (limited to 'sound/core/pcm_memory.c')
| -rw-r--r-- | sound/core/pcm_memory.c | 30 |
1 files changed, 12 insertions, 18 deletions
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c index a0b951471699..506386959f08 100644 --- a/sound/core/pcm_memory.c +++ b/sound/core/pcm_memory.c @@ -38,17 +38,15 @@ static void __update_allocated_size(struct snd_card *card, ssize_t bytes) static void update_allocated_size(struct snd_card *card, ssize_t bytes) { - mutex_lock(&card->memory_mutex); + guard(mutex)(&card->memory_mutex); __update_allocated_size(card, bytes); - mutex_unlock(&card->memory_mutex); } static void decrease_allocated_size(struct snd_card *card, size_t bytes) { - mutex_lock(&card->memory_mutex); + guard(mutex)(&card->memory_mutex); WARN_ON(card->total_pcm_alloc_bytes < bytes); __update_allocated_size(card, -(ssize_t)bytes); - mutex_unlock(&card->memory_mutex); } static int do_alloc_pages(struct snd_card *card, int type, struct device *dev, @@ -58,14 +56,12 @@ static int do_alloc_pages(struct snd_card *card, int type, struct device *dev, int err; /* check and reserve the requested size */ - mutex_lock(&card->memory_mutex); - if (max_alloc_per_card && - card->total_pcm_alloc_bytes + size > max_alloc_per_card) { - mutex_unlock(&card->memory_mutex); - return -ENOMEM; + scoped_guard(mutex, &card->memory_mutex) { + if (max_alloc_per_card && + card->total_pcm_alloc_bytes + size > max_alloc_per_card) + return -ENOMEM; + __update_allocated_size(card, size); } - __update_allocated_size(card, size); - mutex_unlock(&card->memory_mutex); if (str == SNDRV_PCM_STREAM_PLAYBACK) dir = DMA_TO_DEVICE; @@ -191,20 +187,20 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, size_t size; struct snd_dma_buffer new_dmab; - mutex_lock(&substream->pcm->open_mutex); + guard(mutex)(&substream->pcm->open_mutex); if (substream->runtime) { buffer->error = -EBUSY; - goto unlock; + return; } if (!snd_info_get_line(buffer, line, sizeof(line))) { snd_info_get_str(str, line, sizeof(str)); size = simple_strtoul(str, NULL, 10) * 1024; if ((size != 0 && size < 8192) || size > substream->dma_max) { buffer->error = -EINVAL; - goto unlock; + return; } if (substream->dma_buffer.bytes == size) - goto unlock; + return; memset(&new_dmab, 0, sizeof(new_dmab)); new_dmab.dev = substream->dma_buffer.dev; if (size > 0) { @@ -218,7 +214,7 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, substream->pcm->card->number, substream->pcm->device, substream->stream ? 'c' : 'p', substream->number, substream->pcm->name, size); - goto unlock; + return; } substream->buffer_bytes_max = size; } else { @@ -230,8 +226,6 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, } else { buffer->error = -EINVAL; } - unlock: - mutex_unlock(&substream->pcm->open_mutex); } static inline void preallocate_info_init(struct snd_pcm_substream *substream) |