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-rw-r--r--include/sound/control.h11
-rw-r--r--sound/core/control.c27
-rw-r--r--sound/core/pcm.c15
-rw-r--r--sound/core/rawmidi.c14
4 files changed, 38 insertions, 29 deletions
diff --git a/include/sound/control.h b/include/sound/control.h
index 0426139..75f3054 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -93,12 +93,17 @@ struct snd_kctl_event {
struct pid;
+enum {
+ SND_CTL_SUBDEV_PCM,
+ SND_CTL_SUBDEV_RAWMIDI,
+ SND_CTL_SUBDEV_ITEMS,
+};
+
struct snd_ctl_file {
struct list_head list; /* list of all control files */
struct snd_card *card;
struct pid *pid;
- int prefer_pcm_subdevice;
- int prefer_rawmidi_subdevice;
+ int preferred_subdevice[SND_CTL_SUBDEV_ITEMS];
wait_queue_head_t change_sleep;
spinlock_t read_lock;
struct fasync_struct *fasync;
@@ -138,6 +143,8 @@ int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);
#define snd_ctl_unregister_ioctl_compat(fcn)
#endif
+int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type);
+
static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
{
return id->numid - kctl->id.numid;
diff --git a/sound/core/control.c b/sound/core/control.c
index bb96a46..cd246a0 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -50,7 +50,7 @@ static int snd_ctl_open(struct inode *inode, struct file *file)
unsigned long flags;
struct snd_card *card;
struct snd_ctl_file *ctl;
- int err;
+ int i, err;
err = nonseekable_open(inode, file);
if (err < 0)
@@ -79,8 +79,8 @@ 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;
+ for (i = 0; i < SND_CTL_SUBDEV_ITEMS; i++)
+ ctl->preferred_subdevice[i] = -1;
ctl->pid = get_pid(task_pid(current));
file->private_data = ctl;
write_lock_irqsave(&card->ctl_files_rwlock, flags);
@@ -1607,6 +1607,27 @@ static int snd_ctl_fasync(int fd, struct file * file, int on)
return fasync_helper(fd, file, on, &ctl->fasync);
}
+/* return the preferred subdevice number if already assigned;
+ * otherwise return -1
+ */
+int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type)
+{
+ struct snd_ctl_file *kctl;
+ int subdevice = -1;
+
+ read_lock(&card->ctl_files_rwlock);
+ list_for_each_entry(kctl, &card->ctl_files, list) {
+ if (kctl->pid == task_pid(current)) {
+ subdevice = kctl->preferred_subdevice[type];
+ if (subdevice != -1)
+ break;
+ }
+ }
+ read_unlock(&card->ctl_files_rwlock);
+ return subdevice;
+}
+EXPORT_SYMBOL_GPL(snd_ctl_get_preferred_subdevice);
+
/*
* ioctl32 compat
*/
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 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
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 @@ int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
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 @@ int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
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:
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 6fc71a4..be18162 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -369,7 +369,6 @@ static int snd_rawmidi_open(struct inode *inode, struct file *file)
struct snd_rawmidi *rmidi;
struct snd_rawmidi_file *rawmidi_file = NULL;
wait_queue_t wait;
- struct snd_ctl_file *kctl;
if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
return -EINVAL; /* invalid combination */
@@ -413,16 +412,7 @@ static int snd_rawmidi_open(struct inode *inode, struct file *file)
init_waitqueue_entry(&wait, current);
add_wait_queue(&rmidi->open_wait, &wait);
while (1) {
- subdevice = -1;
- read_lock(&card->ctl_files_rwlock);
- list_for_each_entry(kctl, &card->ctl_files, list) {
- if (kctl->pid == task_pid(current)) {
- subdevice = kctl->prefer_rawmidi_subdevice;
- if (subdevice != -1)
- break;
- }
- }
- read_unlock(&card->ctl_files_rwlock);
+ subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
if (err >= 0)
break;
@@ -862,7 +852,7 @@ static int snd_rawmidi_control_ioctl(struct snd_card *card,
if (get_user(val, (int __user *)argp))
return -EFAULT;
- control->prefer_rawmidi_subdevice = val;
+ control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
return 0;
}
case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
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