diff --git a/[refs] b/[refs]
index 1f667c0e8b82..119f5af09df2 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9a7c590930c1d669a032c1b30cc8d95c069dc020
+refs/heads/master: 8dce30c89113e314d29d3b8f362aadff8087fccb
diff --git a/trunk/sound/usb/endpoint.c b/trunk/sound/usb/endpoint.c
index d6e2bb49c59c..060dccb9ec75 100644
--- a/trunk/sound/usb/endpoint.c
+++ b/trunk/sound/usb/endpoint.c
@@ -197,7 +197,13 @@ static void prepare_outbound_urb(struct snd_usb_endpoint *ep,
 			/* no data provider, so send silence */
 			unsigned int offs = 0;
 			for (i = 0; i < ctx->packets; ++i) {
-				int counts = ctx->packet_size[i];
+				int counts;
+
+				if (ctx->packet_size[i])
+					counts = ctx->packet_size[i];
+				else
+					counts = snd_usb_endpoint_next_packet_size(ep);
+
 				urb->iso_frame_desc[i].offset = offs * ep->stride;
 				urb->iso_frame_desc[i].length = counts * ep->stride;
 				offs += counts;