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[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>
This commit is contained in:
Takashi Iwai 2006-08-04 12:57:19 +02:00 committed by Jaroslav Kysela
parent f03d68fe34
commit 2529bba760
3 changed files with 6 additions and 2 deletions
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2
sound/core/control.c
View File

@ -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);

3
sound/core/pcm.c
View File

@ -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);

3
sound/core/rawmidi.c
View File

@ -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);