redonkable/remarkable-linux
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ALSA: line6: Drop superfluous spinlock for trigger

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The trigger callback is already spinlocked, so we need no more lock
here (even for the linked substreams).  Let's drop it.

Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-23 14:49:22 +01:00
parent 5343ecf4e5
commit f2a76225b9
2 changed files with 6 additions and 22 deletions
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23
sound/usb/line6/pcm.c
View file

@ -226,9 +226,8 @@ int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
struct snd_pcm_substream *s;
int err;
int err = 0;
spin_lock(&line6pcm->lock_trigger);
clear_bit(LINE6_INDEX_PREPARED, &line6pcm->flags);
snd_pcm_group_for_each_entry(s, substream) {
@ -237,32 +236,23 @@ int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
switch (s->stream) {
case SNDRV_PCM_STREAM_PLAYBACK:
err = snd_line6_playback_trigger(line6pcm, cmd);
if (err < 0) {
spin_unlock(&line6pcm->lock_trigger);
return err;
}
break;
case SNDRV_PCM_STREAM_CAPTURE:
err = snd_line6_capture_trigger(line6pcm, cmd);
if (err < 0) {
spin_unlock(&line6pcm->lock_trigger);
return err;
}
break;
default:
dev_err(line6pcm->line6->ifcdev,
"Unknown stream direction %d\n", s->stream);
err = -EINVAL;
break;
}
if (err < 0)
break;
}
spin_unlock(&line6pcm->lock_trigger);
return 0;
return err;
}
/* control info callback */
@ -427,7 +417,6 @@ int line6_init_pcm(struct usb_line6 *line6,
spin_lock_init(&line6pcm->lock_audio_out);
spin_lock_init(&line6pcm->lock_audio_in);
spin_lock_init(&line6pcm->lock_trigger);
line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
line6->line6pcm = line6pcm;

5
sound/usb/line6/pcm.h
View file

@ -307,11 +307,6 @@ struct snd_line6_pcm {
*/
spinlock_t lock_audio_in;
/**
Spin lock to protect trigger.
*/
spinlock_t lock_trigger;
/**
PCM playback volume (left and right).
*/