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ALSA: pcm: Unify playback and capture poll callbacks

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The poll callbacks for playback and capture directions are doing
fairly similar but with a slight difference.  This patch unifies the
two functions into a single callback.  The advantage of this
refactoring is that the direction-specific procedures become clearer.

There should be no functional change but only the code cleanup.

Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2018-04-11 18:05:00 +02:00
parent 763e5067aa
commit 6448fcba2a
1 changed files with 20 additions and 56 deletions
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76
sound/core/pcm_native.c
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@ -3095,82 +3095,46 @@ static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
return result;
}
static __poll_t snd_pcm_playback_poll(struct file *file, poll_table * wait)
static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
{
struct snd_pcm_file *pcm_file;
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
__poll_t mask;
__poll_t mask, ok;
snd_pcm_uframes_t avail;
pcm_file = file->private_data;
substream = pcm_file->substream;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
ok = EPOLLOUT | EPOLLWRNORM;
else
ok = EPOLLIN | EPOLLRDNORM;
if (PCM_RUNTIME_CHECK(substream))
return EPOLLOUT | EPOLLWRNORM | EPOLLERR;
runtime = substream->runtime;
return ok | EPOLLERR;
runtime = substream->runtime;
poll_wait(file, &runtime->sleep, wait);
mask = 0;
snd_pcm_stream_lock_irq(substream);
avail = snd_pcm_playback_avail(runtime);
avail = snd_pcm_avail(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_RUNNING:
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_PAUSED:
if (avail >= runtime->control->avail_min) {
mask = EPOLLOUT | EPOLLWRNORM;
break;
}
/* Fall through */
case SNDRV_PCM_STATE_DRAINING:
mask = 0;
break;
default:
mask = EPOLLOUT | EPOLLWRNORM | EPOLLERR;
break;
}
snd_pcm_stream_unlock_irq(substream);
return mask;
}
static __poll_t snd_pcm_capture_poll(struct file *file, poll_table * wait)
{
struct snd_pcm_file *pcm_file;
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
__poll_t mask;
snd_pcm_uframes_t avail;
pcm_file = file->private_data;
substream = pcm_file->substream;
if (PCM_RUNTIME_CHECK(substream))
return EPOLLIN | EPOLLRDNORM | EPOLLERR;
runtime = substream->runtime;
poll_wait(file, &runtime->sleep, wait);
snd_pcm_stream_lock_irq(substream);
avail = snd_pcm_capture_avail(runtime);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_RUNNING:
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_PAUSED:
if (avail >= runtime->control->avail_min) {
mask = EPOLLIN | EPOLLRDNORM;
break;
}
mask = 0;
if (avail >= runtime->control->avail_min)
mask = ok;
break;
case SNDRV_PCM_STATE_DRAINING:
if (avail > 0) {
mask = EPOLLIN | EPOLLRDNORM;
break;
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
mask = ok;
if (!avail)
mask |= EPOLLERR;
}
/* Fall through */
break;
default:
mask = EPOLLIN | EPOLLRDNORM | EPOLLERR;
mask = ok | EPOLLERR;
break;
}
snd_pcm_stream_unlock_irq(substream);
@ -3662,7 +3626,7 @@ const struct file_operations snd_pcm_f_ops[2] = {
.open = snd_pcm_playback_open,
.release = snd_pcm_release,
.llseek = no_llseek,
.poll = snd_pcm_playback_poll,
.poll = snd_pcm_poll,
.unlocked_ioctl = snd_pcm_ioctl,
.compat_ioctl = snd_pcm_ioctl_compat,
.mmap = snd_pcm_mmap,
@ -3676,7 +3640,7 @@ const struct file_operations snd_pcm_f_ops[2] = {
.open = snd_pcm_capture_open,
.release = snd_pcm_release,
.llseek = no_llseek,
.poll = snd_pcm_capture_poll,
.poll = snd_pcm_poll,
.unlocked_ioctl = snd_pcm_ioctl,
.compat_ioctl = snd_pcm_ioctl_compat,
.mmap = snd_pcm_mmap,