[ALSA] Fix substream selection in PCM and rawmidi
The PCM and rawmidi substreams can be selected explicitly by opening
control handle and set via *_PREFER_SUBDEVICE ioctl. But, when
multiple controls are opened, the driver gets confused.
The patch fixes the initialization of prefer_*_subdevice and the
check of multiple controls. The first set subdevice is picked up
as the valid one.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index f52178a..ed3b094 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -792,7 +792,8 @@
kctl = snd_ctl_file(list);
if (kctl->pid == current->pid) {
prefer_subdevice = kctl->prefer_pcm_subdevice;
- break;
+ if (prefer_subdevice != -1)
+ break;
}
}
up_read(&card->controls_rwsem);