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Diffstat (limited to 'sound/core/pcm.c')
-rw-r--r--sound/core/pcm.c88
1 files changed, 58 insertions, 30 deletions
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 9dd9bc7..192a433 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -42,7 +42,7 @@ static int snd_pcm_dev_free(struct snd_device *device);
static int snd_pcm_dev_register(struct snd_device *device);
static int snd_pcm_dev_disconnect(struct snd_device *device);
-static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
+static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
{
struct snd_pcm *pcm;
@@ -53,6 +53,37 @@ static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
return NULL;
}
+static int snd_pcm_next(struct snd_card *card, int device)
+{
+ struct snd_pcm *pcm;
+
+ list_for_each_entry(pcm, &snd_pcm_devices, list) {
+ if (pcm->card == card && pcm->device > device)
+ return pcm->device;
+ else if (pcm->card->number > card->number)
+ return -1;
+ }
+ return -1;
+}
+
+static int snd_pcm_add(struct snd_pcm *newpcm)
+{
+ struct snd_pcm *pcm;
+
+ list_for_each_entry(pcm, &snd_pcm_devices, list) {
+ if (pcm->card == newpcm->card && pcm->device == newpcm->device)
+ return -EBUSY;
+ if (pcm->card->number > newpcm->card->number ||
+ (pcm->card == newpcm->card &&
+ pcm->device > newpcm->device)) {
+ list_add(&newpcm->list, pcm->list.prev);
+ return 0;
+ }
+ }
+ list_add_tail(&newpcm->list, &snd_pcm_devices);
+ return 0;
+}
+
static int snd_pcm_control_ioctl(struct snd_card *card,
struct snd_ctl_file *control,
unsigned int cmd, unsigned long arg)
@@ -65,14 +96,7 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
if (get_user(device, (int __user *)arg))
return -EFAULT;
mutex_lock(&register_mutex);
- device = device < 0 ? 0 : device + 1;
- while (device < SNDRV_PCM_DEVICES) {
- if (snd_pcm_search(card, device))
- break;
- device++;
- }
- if (device == SNDRV_PCM_DEVICES)
- device = -1;
+ device = snd_pcm_next(card, device);
mutex_unlock(&register_mutex);
if (put_user(device, (int __user *)arg))
return -EFAULT;
@@ -98,7 +122,7 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
if (get_user(subdevice, &info->subdevice))
return -EFAULT;
mutex_lock(&register_mutex);
- pcm = snd_pcm_search(card, device);
+ pcm = snd_pcm_get(card, device);
if (pcm == NULL) {
err = -ENXIO;
goto _error;
@@ -232,7 +256,6 @@ static char *snd_pcm_tstamp_mode_names[] = {
static const char *snd_pcm_stream_name(int stream)
{
- snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
return snd_pcm_stream_names[stream];
}
@@ -248,7 +271,6 @@ static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
static const char *snd_pcm_tstamp_mode_name(int mode)
{
- snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
return snd_pcm_tstamp_mode_names[mode];
}
@@ -682,9 +704,10 @@ int snd_pcm_new(struct snd_card *card, char *id, int device,
.dev_disconnect = snd_pcm_dev_disconnect,
};
- snd_assert(rpcm != NULL, return -EINVAL);
- *rpcm = NULL;
- snd_assert(card != NULL, return -ENXIO);
+ if (snd_BUG_ON(!card))
+ return -ENXIO;
+ if (rpcm)
+ *rpcm = NULL;
pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
if (pcm == NULL) {
snd_printk(KERN_ERR "Cannot allocate PCM\n");
@@ -708,7 +731,8 @@ int snd_pcm_new(struct snd_card *card, char *id, int device,
snd_pcm_free(pcm);
return err;
}
- *rpcm = pcm;
+ if (rpcm)
+ *rpcm = pcm;
return 0;
}
@@ -742,7 +766,8 @@ static int snd_pcm_free(struct snd_pcm *pcm)
{
struct snd_pcm_notify *notify;
- snd_assert(pcm != NULL, return -ENXIO);
+ if (!pcm)
+ return 0;
list_for_each_entry(notify, &snd_pcm_notify_list, list) {
notify->n_unregister(pcm);
}
@@ -773,15 +798,15 @@ int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
int prefer_subdevice = -1;
size_t size;
- snd_assert(rsubstream != NULL, return -EINVAL);
+ if (snd_BUG_ON(!pcm || !rsubstream))
+ return -ENXIO;
*rsubstream = NULL;
- snd_assert(pcm != NULL, return -ENXIO);
pstr = &pcm->streams[stream];
if (pstr->substream == NULL || pstr->substream_count == 0)
return -ENODEV;
card = pcm->card;
- down_read(&card->controls_rwsem);
+ read_lock(&card->ctl_files_rwlock);
list_for_each_entry(kctl, &card->ctl_files, list) {
if (kctl->pid == current->pid) {
prefer_subdevice = kctl->prefer_pcm_subdevice;
@@ -789,7 +814,7 @@ int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
break;
}
}
- up_read(&card->controls_rwsem);
+ read_unlock(&card->ctl_files_rwlock);
switch (stream) {
case SNDRV_PCM_STREAM_PLAYBACK:
@@ -883,8 +908,9 @@ void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
+ if (PCM_RUNTIME_CHECK(substream))
+ return;
runtime = substream->runtime;
- snd_assert(runtime != NULL, return);
if (runtime->private_free != NULL)
runtime->private_free(runtime);
snd_free_pages((void*)runtime->status,
@@ -929,13 +955,14 @@ static int snd_pcm_dev_register(struct snd_device *device)
struct snd_pcm *pcm = device->device_data;
struct device *dev;
- snd_assert(pcm != NULL && device != NULL, return -ENXIO);
+ if (snd_BUG_ON(!pcm || !device))
+ return -ENXIO;
mutex_lock(&register_mutex);
- if (snd_pcm_search(pcm->card, pcm->device)) {
+ err = snd_pcm_add(pcm);
+ if (err) {
mutex_unlock(&register_mutex);
- return -EBUSY;
+ return err;
}
- list_add_tail(&pcm->list, &snd_pcm_devices);
for (cidx = 0; cidx < 2; cidx++) {
int devtype = -1;
if (pcm->streams[cidx].substream == NULL)
@@ -1019,10 +1046,11 @@ int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
{
struct snd_pcm *pcm;
- snd_assert(notify != NULL &&
- notify->n_register != NULL &&
- notify->n_unregister != NULL &&
- notify->n_disconnect, return -EINVAL);
+ if (snd_BUG_ON(!notify ||
+ !notify->n_register ||
+ !notify->n_unregister ||
+ !notify->n_disconnect))
+ return -EINVAL;
mutex_lock(&register_mutex);
if (nfree) {
list_del(&notify->list);
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