diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 8818918..99dae02 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -41,7 +41,6 @@
 #include <sound/driver.h>
 #include <linux/bitops.h>
 #include <linux/init.h>
-#include <linux/interrupt.h>
 #include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/string.h>
@@ -185,7 +184,6 @@
 	unsigned int num_formats;		/* number of supported audio formats (list) */
 	struct list_head fmt_list;	/* format list */
 	spinlock_t lock;
-	struct tasklet_struct start_period_elapsed;	/* for start trigger */
 
 	struct snd_urb_ops ops;		/* callbacks (must be filled at init) */
 };
@@ -480,6 +478,28 @@
 }
 
 /*
+ * Prepare urb for streaming before playback starts.
+ *
+ * We don't care about (or have) any data, so we just send a transfer delimiter.
+ */
+static int prepare_startup_playback_urb(snd_usb_substream_t *subs,
+					snd_pcm_runtime_t *runtime,
+					struct urb *urb)
+{
+	unsigned int i;
+	snd_urb_ctx_t *ctx = urb->context;
+
+	urb->dev = ctx->subs->dev;
+	urb->number_of_packets = subs->packs_per_ms;
+	for (i = 0; i < subs->packs_per_ms; ++i) {
+		urb->iso_frame_desc[i].offset = 0;
+		urb->iso_frame_desc[i].length = 0;
+	}
+	urb->transfer_buffer_length = 0;
+	return 0;
+}
+
+/*
  * prepare urb for playback data pipe
  *
  * Since a URB can handle only a single linear buffer, we must use double
@@ -568,12 +588,8 @@
 		subs->hwptr_done -= runtime->buffer_size;
 	spin_unlock_irqrestore(&subs->lock, flags);
 	urb->transfer_buffer_length = offs * stride;
-	if (period_elapsed) {
-		if (likely(subs->running))
-			snd_pcm_period_elapsed(subs->pcm_substream);
-		else
-			tasklet_hi_schedule(&subs->start_period_elapsed);
-	}
+	if (period_elapsed)
+		snd_pcm_period_elapsed(subs->pcm_substream);
 	return 0;
 }
 
@@ -588,22 +604,12 @@
 	return 0;
 }
 
-/*
- * Delay the snd_pcm_period_elapsed() call until after the start trigger
- * callback so that we're not longer in the substream's lock.
- */
-static void start_period_elapsed(unsigned long data)
-{
-	snd_usb_substream_t *subs = (snd_usb_substream_t *)data;
-	snd_pcm_period_elapsed(subs->pcm_substream);
-}
-
 
 /*
  */
 static struct snd_urb_ops audio_urb_ops[2] = {
 	{
-		.prepare =	prepare_playback_urb,
+		.prepare =	prepare_startup_playback_urb,
 		.retire =	retire_playback_urb,
 		.prepare_sync =	prepare_playback_sync_urb,
 		.retire_sync =	retire_playback_sync_urb,
@@ -618,7 +624,7 @@
 
 static struct snd_urb_ops audio_urb_ops_high_speed[2] = {
 	{
-		.prepare =	prepare_playback_urb,
+		.prepare =	prepare_startup_playback_urb,
 		.retire =	retire_playback_urb,
 		.prepare_sync =	prepare_playback_sync_urb_hs,
 		.retire_sync =	retire_playback_sync_urb_hs,
@@ -863,25 +869,40 @@
 
 
 /*
- * start/stop substream
+ * start/stop playback substream
  */
-static int snd_usb_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
+static int snd_usb_pcm_playback_trigger(snd_pcm_substream_t *substream,
+					int cmd)
 {
-	snd_usb_substream_t *subs = (snd_usb_substream_t *)substream->runtime->private_data;
-	int err;
+	snd_usb_substream_t *subs = substream->runtime->private_data;
 
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
-		err = start_urbs(subs, substream->runtime);
-		break;
+		subs->ops.prepare = prepare_playback_urb;
+		return 0;
 	case SNDRV_PCM_TRIGGER_STOP:
-		err = deactivate_urbs(subs, 0, 0);
-		break;
+		return deactivate_urbs(subs, 0, 0);
 	default:
-		err = -EINVAL;
-		break;
+		return -EINVAL;
 	}
-	return err < 0 ? err : 0;
+}
+
+/*
+ * start/stop capture substream
+ */
+static int snd_usb_pcm_capture_trigger(snd_pcm_substream_t *substream,
+				       int cmd)
+{
+	snd_usb_substream_t *subs = substream->runtime->private_data;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		return start_urbs(subs, substream->runtime);
+	case SNDRV_PCM_TRIGGER_STOP:
+		return deactivate_urbs(subs, 0, 0);
+	default:
+		return -EINVAL;
+	}
 }
 
 
@@ -1413,7 +1434,7 @@
 static int snd_usb_pcm_prepare(snd_pcm_substream_t *substream)
 {
 	snd_pcm_runtime_t *runtime = substream->runtime;
-	snd_usb_substream_t *subs = (snd_usb_substream_t *)runtime->private_data;
+	snd_usb_substream_t *subs = runtime->private_data;
 
 	if (! subs->cur_audiofmt) {
 		snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
@@ -1433,7 +1454,13 @@
 	deactivate_urbs(subs, 0, 1);
 	wait_clear_urbs(subs);
 
-	return 0;
+	/* for playback, submit the URBs now; otherwise, the first hwptr_done
+	 * updates for all URBs would happen at the same time when starting */
+	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
+		subs->ops.prepare = prepare_startup_playback_urb;
+		return start_urbs(subs, runtime);
+	} else
+		return 0;
 }
 
 static snd_pcm_hardware_t snd_usb_playback =
@@ -1847,7 +1874,7 @@
 	.hw_params =	snd_usb_hw_params,
 	.hw_free =	snd_usb_hw_free,
 	.prepare =	snd_usb_pcm_prepare,
-	.trigger =	snd_usb_pcm_trigger,
+	.trigger =	snd_usb_pcm_playback_trigger,
 	.pointer =	snd_usb_pcm_pointer,
 	.page =		snd_pcm_get_vmalloc_page,
 };
@@ -1859,7 +1886,7 @@
 	.hw_params =	snd_usb_hw_params,
 	.hw_free =	snd_usb_hw_free,
 	.prepare =	snd_usb_pcm_prepare,
-	.trigger =	snd_usb_pcm_trigger,
+	.trigger =	snd_usb_pcm_capture_trigger,
 	.pointer =	snd_usb_pcm_pointer,
 	.page =		snd_pcm_get_vmalloc_page,
 };
@@ -2078,9 +2105,6 @@
 
 	INIT_LIST_HEAD(&subs->fmt_list);
 	spin_lock_init(&subs->lock);
-	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
-		tasklet_init(&subs->start_period_elapsed, start_period_elapsed,
-			     (unsigned long)subs);
 
 	subs->stream = as;
 	subs->direction = stream;