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authorTakashi Iwai <tiwai@suse.de>2006-08-04 12:57:19 +0200
committerJaroslav Kysela <perex@suse.cz>2006-09-23 10:39:59 +0200
commit2529bba7606b23c1b7161d3c2ad486162e8650f9 (patch)
treefc19403b51f9a8c3d080fac7acd50c3a95cb652c /sound/core
parentf03d68fe343d70bb06ecdb3d70dcf0e678ed99f9 (diff)
downloadlinux-2529bba7606b23c1b7161d3c2ad486162e8650f9.tar.bz2
[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>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/control.c2
-rw-r--r--sound/core/pcm.c3
-rw-r--r--sound/core/rawmidi.c3
3 files changed, 6 insertions, 2 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index 31ad58154c06..ac1442682eac 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -75,6 +75,8 @@ static int snd_ctl_open(struct inode *inode, struct file *file)
init_waitqueue_head(&ctl->change_sleep);
spin_lock_init(&ctl->read_lock);
ctl->card = card;
+ ctl->prefer_pcm_subdevice = -1;
+ ctl->prefer_rawmidi_subdevice = -1;
ctl->pid = current->pid;
file->private_data = ctl;
write_lock_irqsave(&card->ctl_files_rwlock, flags);
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index f52178abf120..ed3b09469560 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -792,7 +792,8 @@ int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
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);
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 8a2bdfae63e3..269c467ca9bb 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -430,7 +430,8 @@ static int snd_rawmidi_open(struct inode *inode, struct file *file)
kctl = snd_ctl_file(list);
if (kctl->pid == current->pid) {
subdevice = kctl->prefer_rawmidi_subdevice;
- break;
+ if (subdevice != -1)
+ break;
}
}
up_read(&card->controls_rwsem);