aboutsummaryrefslogtreecommitdiff
path: root/sound/core/pcm.c
diff options
context:
space:
mode:
authorTakashi Iwai <tiwai@suse.de>2015-02-20 16:26:00 +0100
committerTakashi Iwai <tiwai@suse.de>2015-02-20 19:51:04 +0100
commitad876c862278be59147d4004f1a7c4d492e4ec96 (patch)
tree748431218e3b37038c1a15bbc0547d91d94c7961 /sound/core/pcm.c
parent0c8d948565490d2a2db9d9a5aec388342c7d38ce (diff)
downloadlinux-linaro-stable-ad876c862278be59147d4004f1a7c4d492e4ec96.tar.gz
ALSA: pcm: Minor refactoring in snd_pcm_attach_substream()
No functional changes at all. Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/pcm.c')
-rw-r--r--sound/core/pcm.c41
1 files changed, 15 insertions, 26 deletions
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 0345e53a340c..d63d262c571e 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -919,6 +919,9 @@ int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
if (snd_BUG_ON(!pcm || !rsubstream))
return -ENXIO;
+ if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
+ stream != SNDRV_PCM_STREAM_CAPTURE))
+ return -EINVAL;
*rsubstream = NULL;
pstr = &pcm->streams[stream];
if (pstr->substream == NULL || pstr->substream_count == 0)
@@ -927,25 +930,14 @@ int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
card = pcm->card;
prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
- switch (stream) {
- case SNDRV_PCM_STREAM_PLAYBACK:
- if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
- for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
- if (SUBSTREAM_BUSY(substream))
- return -EAGAIN;
- }
- }
- break;
- case SNDRV_PCM_STREAM_CAPTURE:
- if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
- for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
- if (SUBSTREAM_BUSY(substream))
- return -EAGAIN;
- }
+ if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
+ int opposite = !stream;
+
+ for (substream = pcm->streams[opposite].substream; substream;
+ substream = substream->next) {
+ if (SUBSTREAM_BUSY(substream))
+ return -EAGAIN;
}
- break;
- default:
- return -EINVAL;
}
if (file->f_flags & O_APPEND) {
@@ -968,15 +960,12 @@ int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
return 0;
}
- if (prefer_subdevice >= 0) {
- for (substream = pstr->substream; substream; substream = substream->next)
- if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
- goto __ok;
- }
- for (substream = pstr->substream; substream; substream = substream->next)
- if (!SUBSTREAM_BUSY(substream))
+ for (substream = pstr->substream; substream; substream = substream->next) {
+ if (!SUBSTREAM_BUSY(substream) &&
+ (prefer_subdevice == -1 ||
+ substream->number == prefer_subdevice))
break;
- __ok:
+ }
if (substream == NULL)
return -EAGAIN;