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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
This commit is contained in:
Takashi Iwai 2024-02-27 09:53:03 +01:00
parent 1affe7bb50
commit dd0da75b9a
3 changed files with 59 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

90
sound/core/pcm.c
View File

@ -91,9 +91,8 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
if (get_user(device, (int __user *)arg))
return -EFAULT;
mutex_lock(&register_mutex);
device = snd_pcm_next(card, device);
mutex_unlock(&register_mutex);
scoped_guard(mutex, &register_mutex)
device = snd_pcm_next(card, device);
if (put_user(device, (int __user *)arg))
return -EFAULT;
return 0;
@ -106,7 +105,6 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
struct snd_pcm *pcm;
struct snd_pcm_str *pstr;
struct snd_pcm_substream *substream;
int err;
info = (struct snd_pcm_info __user *)arg;
if (get_user(device, &info->device))
@ -118,35 +116,23 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
stream = array_index_nospec(stream, 2);
if (get_user(subdevice, &info->subdevice))
return -EFAULT;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
pcm = snd_pcm_get(card, device);
if (pcm == NULL) {
err = -ENXIO;
goto _error;
}
if (pcm == NULL)
return -ENXIO;
pstr = &pcm->streams[stream];
if (pstr->substream_count == 0) {
err = -ENOENT;
goto _error;
}
if (subdevice >= pstr->substream_count) {
err = -ENXIO;
goto _error;
}
if (pstr->substream_count == 0)
return -ENOENT;
if (subdevice >= pstr->substream_count)
return -ENXIO;
for (substream = pstr->substream; substream;
substream = substream->next)
if (substream->number == (int)subdevice)
break;
if (substream == NULL) {
err = -ENXIO;
goto _error;
}
mutex_lock(&pcm->open_mutex);
err = snd_pcm_info_user(substream, info);
mutex_unlock(&pcm->open_mutex);
_error:
mutex_unlock(&register_mutex);
return err;
if (substream == NULL)
return -ENXIO;
guard(mutex)(&pcm->open_mutex);
return snd_pcm_info_user(substream, info);
}
case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
{
@ -389,15 +375,15 @@ static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
struct snd_pcm_substream *substream = entry->private_data;
struct snd_pcm_runtime *runtime;
mutex_lock(&substream->pcm->open_mutex);
guard(mutex)(&substream->pcm->open_mutex);
runtime = substream->runtime;
if (!runtime) {
snd_iprintf(buffer, "closed\n");
goto unlock;
return;
}
if (runtime->state == SNDRV_PCM_STATE_OPEN) {
snd_iprintf(buffer, "no setup\n");
goto unlock;
return;
}
snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
@ -416,8 +402,6 @@ static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
}
#endif
unlock:
mutex_unlock(&substream->pcm->open_mutex);
}
static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
@ -426,15 +410,15 @@ static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
struct snd_pcm_substream *substream = entry->private_data;
struct snd_pcm_runtime *runtime;
mutex_lock(&substream->pcm->open_mutex);
guard(mutex)(&substream->pcm->open_mutex);
runtime = substream->runtime;
if (!runtime) {
snd_iprintf(buffer, "closed\n");
goto unlock;
return;
}
if (runtime->state == SNDRV_PCM_STATE_OPEN) {
snd_iprintf(buffer, "no setup\n");
goto unlock;
return;
}
snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
@ -444,8 +428,6 @@ static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
unlock:
mutex_unlock(&substream->pcm->open_mutex);
}
static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
@ -456,17 +438,17 @@ static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
struct snd_pcm_status64 status;
int err;
mutex_lock(&substream->pcm->open_mutex);
guard(mutex)(&substream->pcm->open_mutex);
runtime = substream->runtime;
if (!runtime) {
snd_iprintf(buffer, "closed\n");
goto unlock;
return;
}
memset(&status, 0, sizeof(status));
err = snd_pcm_status64(substream, &status);
if (err < 0) {
snd_iprintf(buffer, "error %d\n", err);
goto unlock;
return;
}
snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
@ -480,8 +462,6 @@ static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
snd_iprintf(buffer, "-----\n");
snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
unlock:
mutex_unlock(&substream->pcm->open_mutex);
}
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
@ -1009,9 +989,8 @@ void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
kfree(runtime->hw_constraints.rules);
/* Avoid concurrent access to runtime via PCM timer interface */
if (substream->timer) {
spin_lock_irq(&substream->timer->lock);
substream->runtime = NULL;
spin_unlock_irq(&substream->timer->lock);
scoped_guard(spinlock_irq, &substream->timer->lock)
substream->runtime = NULL;
} else {
substream->runtime = NULL;
}
@ -1068,10 +1047,10 @@ static int snd_pcm_dev_register(struct snd_device *device)
return -ENXIO;
pcm = device->device_data;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
err = snd_pcm_add(pcm);
if (err)
goto unlock;
return err;
for (cidx = 0; cidx < 2; cidx++) {
int devtype = -1;
if (pcm->streams[cidx].substream == NULL)
@ -1090,7 +1069,7 @@ static int snd_pcm_dev_register(struct snd_device *device)
pcm->streams[cidx].dev);
if (err < 0) {
list_del_init(&pcm->list);
goto unlock;
return err;
}
for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
@ -1098,9 +1077,6 @@ static int snd_pcm_dev_register(struct snd_device *device)
}
pcm_call_notify(pcm, n_register);
unlock:
mutex_unlock(&register_mutex);
return err;
}
@ -1110,8 +1086,8 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
struct snd_pcm_substream *substream;
int cidx;
mutex_lock(&register_mutex);
mutex_lock(&pcm->open_mutex);
guard(mutex)(&register_mutex);
guard(mutex)(&pcm->open_mutex);
wake_up(&pcm->open_wait);
list_del_init(&pcm->list);
@ -1138,8 +1114,6 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
snd_unregister_device(pcm->streams[cidx].dev);
free_chmap(&pcm->streams[cidx]);
}
mutex_unlock(&pcm->open_mutex);
mutex_unlock(&register_mutex);
return 0;
}
@ -1164,7 +1138,7 @@ int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
!notify->n_unregister ||
!notify->n_disconnect))
return -EINVAL;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
if (nfree) {
list_del(&notify->list);
list_for_each_entry(pcm, &snd_pcm_devices, list)
@ -1174,7 +1148,6 @@ int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
list_for_each_entry(pcm, &snd_pcm_devices, list)
notify->n_register(pcm);
}
mutex_unlock(&register_mutex);
return 0;
}
EXPORT_SYMBOL(snd_pcm_notify);
@ -1190,7 +1163,7 @@ static void snd_pcm_proc_read(struct snd_info_entry *entry,
{
struct snd_pcm *pcm;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
list_for_each_entry(pcm, &snd_pcm_devices, list) {
snd_iprintf(buffer, "%02i-%02i: %s : %s",
pcm->card->number, pcm->device, pcm->id, pcm->name);
@ -1202,7 +1175,6 @@ static void snd_pcm_proc_read(struct snd_info_entry *entry,
pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
snd_iprintf(buffer, "\n");
}
mutex_unlock(&register_mutex);
}
static struct snd_info_entry *snd_pcm_proc_entry;

30
sound/core/pcm_memory.c
View File

@ -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)

48
sound/core/pcm_native.c
View File

@ -1398,17 +1398,15 @@ static int snd_pcm_action_nonatomic(const struct action_ops *ops,
int res;
/* Guarantee the group members won't change during non-atomic action */
down_read(&snd_pcm_link_rwsem);
guard(rwsem_read)(&snd_pcm_link_rwsem);
res = snd_pcm_buffer_access_lock(substream->runtime);
if (res < 0)
goto unlock;
return res;
if (snd_pcm_stream_linked(substream))
res = snd_pcm_action_group(ops, substream, state, false);
else
res = snd_pcm_action_single(ops, substream, state);
snd_pcm_buffer_access_unlock(substream->runtime);
unlock:
up_read(&snd_pcm_link_rwsem);
return res;
}
@ -2259,7 +2257,6 @@ static bool is_pcm_file(struct file *file)
*/
static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
{
int res = 0;
struct snd_pcm_file *pcm_file;
struct snd_pcm_substream *substream1;
struct snd_pcm_group *group __free(kfree) = NULL;
@ -2281,20 +2278,15 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
group = kzalloc(sizeof(*group), GFP_KERNEL);
if (!group)
return -ENOMEM;
snd_pcm_group_init(group);
down_write(&snd_pcm_link_rwsem);
guard(rwsem_write)(&snd_pcm_link_rwsem);
if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
substream->runtime->state != substream1->runtime->state ||
substream->pcm->nonatomic != substream1->pcm->nonatomic) {
res = -EBADFD;
goto _end;
}
if (snd_pcm_stream_linked(substream1)) {
res = -EALREADY;
goto _end;
}
substream->pcm->nonatomic != substream1->pcm->nonatomic)
return -EBADFD;
if (snd_pcm_stream_linked(substream1))
return -EALREADY;
snd_pcm_stream_lock_irq(substream);
if (!snd_pcm_stream_linked(substream)) {
@ -2310,9 +2302,7 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
refcount_inc(&target_group->refs);
snd_pcm_stream_unlock(substream1);
snd_pcm_group_unlock_irq(target_group, nonatomic);
_end:
up_write(&snd_pcm_link_rwsem);
return res;
return 0;
}
static void relink_to_local(struct snd_pcm_substream *substream)
@ -2327,14 +2317,11 @@ static int snd_pcm_unlink(struct snd_pcm_substream *substream)
struct snd_pcm_group *group;
bool nonatomic = substream->pcm->nonatomic;
bool do_free = false;
int res = 0;
down_write(&snd_pcm_link_rwsem);
guard(rwsem_write)(&snd_pcm_link_rwsem);
if (!snd_pcm_stream_linked(substream)) {
res = -EALREADY;
goto _end;
}
if (!snd_pcm_stream_linked(substream))
return -EALREADY;
group = substream->group;
snd_pcm_group_lock_irq(group, nonatomic);
@ -2353,10 +2340,7 @@ static int snd_pcm_unlink(struct snd_pcm_substream *substream)
snd_pcm_group_unlock_irq(group, nonatomic);
if (do_free)
kfree(group);
_end:
up_write(&snd_pcm_link_rwsem);
return res;
return 0;
}
/*
@ -2929,10 +2913,10 @@ static int snd_pcm_release(struct inode *inode, struct file *file)
/* block until the device gets woken up as it may touch the hardware */
snd_power_wait(pcm->card);
mutex_lock(&pcm->open_mutex);
snd_pcm_release_substream(substream);
kfree(pcm_file);
mutex_unlock(&pcm->open_mutex);
scoped_guard(mutex, &pcm->open_mutex) {
snd_pcm_release_substream(substream);
kfree(pcm_file);
}
wake_up(&pcm->open_wait);
module_put(pcm->card->module);
snd_card_file_remove(pcm->card, file);