ALSA: seq: Use no intrruptible mutex_lock

All usages of mutex in ALSA sequencer core would take too long, hence
we don't have to care about the user interruption that makes things
complicated.  Let's replace them with simpler mutex_lock().
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/seq/seq_clientmgr.c

@@ -311,10 +311,9 @@ static int snd_seq_open(struct inode *inode, struct file *file)
 	if (err < 0)
 		return err;
 
-	if (mutex_lock_interruptible(&register_mutex))
-		return -ERESTARTSYS;
+	mutex_lock(&register_mutex);
 	client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
-	if (client == NULL) {
+	if (!client) {
 		mutex_unlock(&register_mutex);
 		return -ENOMEM;	/* failure code */
 	}
@@ -1704,10 +1703,7 @@ static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
 	if (queue == NULL)
 		return -EINVAL;
 
-	if (mutex_lock_interruptible(&queue->timer_mutex)) {
-		queuefree(queue);
-		return -ERESTARTSYS;
-	}
+	mutex_lock(&queue->timer_mutex);
 	tmr = queue->timer;
 	memset(timer, 0, sizeof(*timer));
 	timer->queue = queue->queue;
@@ -1741,10 +1737,7 @@ static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
 		q = queueptr(timer->queue);
 		if (q == NULL)
 			return -ENXIO;
-		if (mutex_lock_interruptible(&q->timer_mutex)) {
-			queuefree(q);
-			return -ERESTARTSYS;
-		}
+		mutex_lock(&q->timer_mutex);
 		tmr = q->timer;
 		snd_seq_queue_timer_close(timer->queue);
 		tmr->type = timer->type;
@@ -2180,8 +2173,7 @@ int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
 	if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
 		return -EINVAL;
 
-	if (mutex_lock_interruptible(&register_mutex))
-		return -ERESTARTSYS;
+	mutex_lock(&register_mutex);
 
 	if (card) {
 		client_index += SNDRV_SEQ_GLOBAL_CLIENTS
@@ -2522,19 +2514,15 @@ int __init snd_sequencer_device_init(void)
 	snd_device_initialize(&seq_dev, NULL);
 	dev_set_name(&seq_dev, "seq");
 
-	if (mutex_lock_interruptible(&register_mutex))
-		return -ERESTARTSYS;
-
+	mutex_lock(&register_mutex);
 	err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
 				  &snd_seq_f_ops, NULL, &seq_dev);
+	mutex_unlock(&register_mutex);
 	if (err < 0) {
-		mutex_unlock(&register_mutex);
 		put_device(&seq_dev);
 		return err;
 	}
 	
-	mutex_unlock(&register_mutex);
-
 	return 0;
 }