1 files changed, 11 insertions, 10 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 1a07750..1c6be91 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1481,11 +1481,20 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream,
 			break; /* all drained */
 		init_waitqueue_entry(&wait, current);
 		add_wait_queue(&to_check->sleep, &wait);
-		set_current_state(TASK_INTERRUPTIBLE);
 		snd_pcm_stream_unlock_irq(substream);
 		up_read(&snd_pcm_link_rwsem);
 		snd_power_unlock(card);
-		tout = schedule_timeout(10 * HZ);
+		if (runtime->no_period_wakeup)
+			tout = MAX_SCHEDULE_TIMEOUT;
+		else {
+			tout = 10;
+			if (runtime->rate) {
+				long t = runtime->period_size * 2 / runtime->rate;
+				tout = max(t, tout);
+			}
+			tout = msecs_to_jiffies(tout * 1000);
+		}
+		tout = schedule_timeout_interruptible(tout);
 		snd_power_lock(card);
 		down_read(&snd_pcm_link_rwsem);
 		snd_pcm_stream_lock_irq(substream);
@@ -1518,13 +1527,11 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream,
 static int snd_pcm_drop(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime;
-	struct snd_card *card;
 	int result = 0;
 	
 	if (PCM_RUNTIME_CHECK(substream))
 		return -ENXIO;
 	runtime = substream->runtime;
-	card = substream->pcm->card;
 
 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
 	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
@@ -2056,7 +2063,6 @@ static int snd_pcm_open_file(struct file *file,
 {
 	struct snd_pcm_file *pcm_file;
 	struct snd_pcm_substream *substream;
-	struct snd_pcm_str *str;
 	int err;
 
 	if (rpcm_file)
@@ -2073,7 +2079,6 @@ static int snd_pcm_open_file(struct file *file,
 	}
 	pcm_file->substream = substream;
 	if (substream->ref_count == 1) {
-		str = substream->pstr;
 		substream->file = pcm_file;
 		substream->pcm_release = pcm_release_private;
 	}
@@ -3015,11 +3020,9 @@ static const struct vm_operations_struct snd_pcm_vm_ops_status =
 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
 			       struct vm_area_struct *area)
 {
-	struct snd_pcm_runtime *runtime;
 	long size;
 	if (!(area->vm_flags & VM_READ))
 		return -EINVAL;
-	runtime = substream->runtime;
 	size = area->vm_end - area->vm_start;
 	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
 		return -EINVAL;
@@ -3054,11 +3057,9 @@ static const struct vm_operations_struct snd_pcm_vm_ops_control =
 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
 				struct vm_area_struct *area)
 {
-	struct snd_pcm_runtime *runtime;
 	long size;
 	if (!(area->vm_flags & VM_READ))
 		return -EINVAL;
-	runtime = substream->runtime;
 	size = area->vm_end - area->vm_start;
 	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
 		return -EINVAL;