diff --git a/drivers/staging/line6/capture.c b/drivers/staging/line6/capture.c
index 8f59ff3..127f952 100644
--- a/drivers/staging/line6/capture.c
+++ b/drivers/staging/line6/capture.c
@@ -193,6 +193,31 @@
 	}
 }
 
+int line6_alloc_capture_buffer(struct snd_line6_pcm *line6pcm)
+{
+	/* We may be invoked multiple times in a row so allocate once only */
+	if (line6pcm->buffer_in)
+		return 0;
+
+	line6pcm->buffer_in =
+		kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
+			line6pcm->max_packet_size, GFP_KERNEL);
+
+	if (!line6pcm->buffer_in) {
+		dev_err(line6pcm->line6->ifcdev,
+			"cannot malloc capture buffer\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
+{
+	kfree(line6pcm->buffer_in);
+	line6pcm->buffer_in = NULL;
+}
+
 /*
  * Callback for completed capture URB.
  */
@@ -316,16 +341,11 @@
 	}
 	/* -- [FD] end */
 
-	/* We may be invoked multiple times in a row so allocate once only */
-	if (!line6pcm->buffer_in)
-		line6pcm->buffer_in =
-			kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
-				line6pcm->max_packet_size, GFP_KERNEL);
+	if ((line6pcm->flags & MASK_CAPTURE) == 0) {
+		ret = line6_alloc_capture_buffer(line6pcm);
 
-	if (!line6pcm->buffer_in) {
-		dev_err(line6pcm->line6->ifcdev,
-			"cannot malloc capture buffer\n");
-		return -ENOMEM;
+		if (ret < 0)
+			return ret;
 	}
 
 	ret = snd_pcm_lib_malloc_pages(substream,
@@ -342,9 +362,11 @@
 {
 	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 
-	line6_unlink_wait_clear_audio_in_urbs(line6pcm);
-	kfree(line6pcm->buffer_in);
-	line6pcm->buffer_in = NULL;
+	if ((line6pcm->flags & MASK_CAPTURE) == 0) {
+		line6_unlink_wait_clear_audio_in_urbs(line6pcm);
+		line6_free_capture_buffer(line6pcm);
+	}
+
 	return snd_pcm_lib_free_pages(substream);
 }
 
diff --git a/drivers/staging/line6/capture.h b/drivers/staging/line6/capture.h
index a7509fb..366cbaa 100644
--- a/drivers/staging/line6/capture.h
+++ b/drivers/staging/line6/capture.h
@@ -19,11 +19,13 @@
 
 extern struct snd_pcm_ops snd_line6_capture_ops;
 
+extern int line6_alloc_capture_buffer(struct snd_line6_pcm *line6pcm);
 extern void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf,
 			       int fsize);
 extern void line6_capture_check_period(struct snd_line6_pcm *line6pcm,
 				       int length);
 extern int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm);
+extern void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm);
 extern int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm);
 extern void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm);
 extern void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm
diff --git a/drivers/staging/line6/pcm.c b/drivers/staging/line6/pcm.c
index 68727b2..37675e6 100644
--- a/drivers/staging/line6/pcm.c
+++ b/drivers/staging/line6/pcm.c
@@ -86,17 +86,22 @@
 
 #endif
 
+static bool test_flags(unsigned long flags0, unsigned long flags1,
+		       unsigned long mask)
+{
+	return ((flags0 & mask) == 0) && ((flags1 & mask) != 0);
+}
+
 int line6_pcm_start(struct snd_line6_pcm *line6pcm, int channels)
 {
 	unsigned long flags_old =
 	    __sync_fetch_and_or(&line6pcm->flags, channels);
 	unsigned long flags_new = flags_old | channels;
 	int err = 0;
-
+	
 	line6pcm->prev_fbuf = NULL;
 
-	if (((flags_old & MASK_CAPTURE) == 0) &&
-	    ((flags_new & MASK_CAPTURE) != 0)) {
+	if (test_flags(flags_old, flags_new, MASK_CAPTURE)) {
 		/*
 		   Waiting for completion of active URBs in the stop handler is
 		   a bug, we therefore report an error if capturing is restarted
@@ -105,34 +110,47 @@
 		if (line6pcm->active_urb_in | line6pcm->unlink_urb_in)
 			return -EBUSY;
 
+		if (!(flags_new & MASK_PCM_ALSA_CAPTURE)) {
+			err = line6_alloc_capture_buffer(line6pcm);
+
+			if (err < 0)
+				goto pcm_start_error;
+		}
+
 		line6pcm->count_in = 0;
 		line6pcm->prev_fsize = 0;
 		err = line6_submit_audio_in_all_urbs(line6pcm);
 
-		if (err < 0) {
-			__sync_fetch_and_and(&line6pcm->flags, ~channels);
-			return err;
-		}
+		if (err < 0)
+			goto pcm_start_error;
 	}
 
-	if (((flags_old & MASK_PLAYBACK) == 0) &&
-	    ((flags_new & MASK_PLAYBACK) != 0)) {
+	if (test_flags(flags_old, flags_new, MASK_PLAYBACK)) {
 		/*
 		   See comment above regarding PCM restart.
 		 */
 		if (line6pcm->active_urb_out | line6pcm->unlink_urb_out)
 			return -EBUSY;
 
+		if (!(flags_new & MASK_PCM_ALSA_PLAYBACK)) {
+			err = line6_alloc_playback_buffer(line6pcm);
+
+			if (err < 0)
+				goto pcm_start_error;
+		}
+
 		line6pcm->count_out = 0;
 		err = line6_submit_audio_out_all_urbs(line6pcm);
 
-		if (err < 0) {
-			__sync_fetch_and_and(&line6pcm->flags, ~channels);
-			return err;
-		}
+		if (err < 0)
+			goto pcm_start_error;
 	}
 
 	return 0;
+
+pcm_start_error:
+	__sync_fetch_and_and(&line6pcm->flags, ~channels);
+	return err;
 }
 
 int line6_pcm_stop(struct snd_line6_pcm *line6pcm, int channels)
@@ -141,14 +159,18 @@
 	    __sync_fetch_and_and(&line6pcm->flags, ~channels);
 	unsigned long flags_new = flags_old & ~channels;
 
-	if (((flags_old & MASK_CAPTURE) != 0) &&
-	    ((flags_new & MASK_CAPTURE) == 0)) {
+	if (test_flags(flags_new, flags_old, MASK_CAPTURE)) {
 		line6_unlink_audio_in_urbs(line6pcm);
+
+		if (!(flags_old & MASK_PCM_ALSA_CAPTURE))
+			line6_free_capture_buffer(line6pcm);
 	}
 
-	if (((flags_old & MASK_PLAYBACK) != 0) &&
-	    ((flags_new & MASK_PLAYBACK) == 0)) {
+	if (test_flags(flags_new, flags_old, MASK_PLAYBACK)) {
 		line6_unlink_audio_out_urbs(line6pcm);
+
+		if (!(flags_old & MASK_PCM_ALSA_PLAYBACK))
+			line6_free_playback_buffer(line6pcm);
 	}
 
 	return 0;
@@ -476,18 +498,21 @@
 
 	switch (substream->stream) {
 	case SNDRV_PCM_STREAM_PLAYBACK:
-		line6_unlink_wait_clear_audio_out_urbs(line6pcm);
+		if ((line6pcm->flags & MASK_PLAYBACK) == 0)
+			line6_unlink_wait_clear_audio_out_urbs(line6pcm);
+
 		break;
 
 	case SNDRV_PCM_STREAM_CAPTURE:
-		line6_unlink_wait_clear_audio_in_urbs(line6pcm);
+		if ((line6pcm->flags & MASK_CAPTURE) == 0)
+			line6_unlink_wait_clear_audio_in_urbs(line6pcm);
+
 		break;
 
 	default:
 		MISSING_CASE;
 	}
 
-
 	if (!test_and_set_bit(BIT_PREPARED, &line6pcm->flags)) {
 		line6pcm->count_out = 0;
 		line6pcm->pos_out = 0;
diff --git a/drivers/staging/line6/playback.c b/drivers/staging/line6/playback.c
index 9a51b92..4152db2 100644
--- a/drivers/staging/line6/playback.c
+++ b/drivers/staging/line6/playback.c
@@ -351,6 +351,31 @@
 	wait_clear_audio_out_urbs(line6pcm);
 }
 
+int line6_alloc_playback_buffer(struct snd_line6_pcm *line6pcm)
+{
+	/* We may be invoked multiple times in a row so allocate once only */
+	if (line6pcm->buffer_out)
+		return 0;
+
+	line6pcm->buffer_out =
+		kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
+			line6pcm->max_packet_size, GFP_KERNEL);
+
+	if (!line6pcm->buffer_out) {
+		dev_err(line6pcm->line6->ifcdev,
+			"cannot malloc playback buffer\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
+{
+	kfree(line6pcm->buffer_out);
+	line6pcm->buffer_out = NULL;
+}
+
 /*
 	Callback for completed playback URB.
 */
@@ -459,16 +484,11 @@
 	}
 	/* -- [FD] end */
 
-	/* We may be invoked multiple times in a row so allocate once only */
-	if (!line6pcm->buffer_out)
-		line6pcm->buffer_out =
-			kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
-				line6pcm->max_packet_size, GFP_KERNEL);
+	if ((line6pcm->flags & MASK_PLAYBACK) == 0) {
+		ret = line6_alloc_playback_buffer(line6pcm);
 
-	if (!line6pcm->buffer_out) {
-		dev_err(line6pcm->line6->ifcdev,
-			"cannot malloc playback buffer\n");
-		return -ENOMEM;
+		if (ret < 0)
+			return ret;
 	}
 
 	ret = snd_pcm_lib_malloc_pages(substream,
@@ -485,9 +505,11 @@
 {
 	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 
-	line6_unlink_wait_clear_audio_out_urbs(line6pcm);
-	kfree(line6pcm->buffer_out);
-	line6pcm->buffer_out = NULL;
+	if ((line6pcm->flags & MASK_PLAYBACK) == 0) {
+		line6_unlink_wait_clear_audio_out_urbs(line6pcm);
+		line6_free_playback_buffer(line6pcm);
+	}
+
 	return snd_pcm_lib_free_pages(substream);
 }
 
diff --git a/drivers/staging/line6/playback.h b/drivers/staging/line6/playback.h
index f2fc8c0..02487ff 100644
--- a/drivers/staging/line6/playback.h
+++ b/drivers/staging/line6/playback.h
@@ -29,7 +29,9 @@
 
 extern struct snd_pcm_ops snd_line6_playback_ops;
 
+extern int line6_alloc_playback_buffer(struct snd_line6_pcm *line6pcm);
 extern int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm);
+extern void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm);
 extern int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm);
 extern void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm);
 extern void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm
diff --git a/drivers/staging/line6/revision.h b/drivers/staging/line6/revision.h
index 350d0df..b4eee2b 100644
--- a/drivers/staging/line6/revision.h
+++ b/drivers/staging/line6/revision.h
@@ -1,4 +1,4 @@
 #ifndef DRIVER_REVISION
 /* current subversion revision */
-#define DRIVER_REVISION " (revision 690)"
+#define DRIVER_REVISION " (904)"
 #endif