ALSA: control: Provide a helper to look for the preferred subdevice
Instead of open-coding the search over the control file loop, provide
a helper function for the preferred subdevice assigned to the current
process.
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index dba5180..1b7c473 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -161,7 +161,7 @@
if (get_user(val, (int __user *)arg))
return -EFAULT;
- control->prefer_pcm_subdevice = val;
+ control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
return 0;
}
}
@@ -901,9 +901,8 @@
struct snd_pcm_str * pstr;
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
- struct snd_ctl_file *kctl;
struct snd_card *card;
- int prefer_subdevice = -1;
+ int prefer_subdevice;
size_t size;
if (snd_BUG_ON(!pcm || !rsubstream))
@@ -914,15 +913,7 @@
return -ENODEV;
card = pcm->card;
- read_lock(&card->ctl_files_rwlock);
- list_for_each_entry(kctl, &card->ctl_files, list) {
- if (kctl->pid == task_pid(current)) {
- prefer_subdevice = kctl->prefer_pcm_subdevice;
- if (prefer_subdevice != -1)
- break;
- }
- }
- read_unlock(&card->ctl_files_rwlock);
+ prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
switch (stream) {
case SNDRV_PCM_STREAM_PLAYBACK: