3 files changed, 8 insertions, 13 deletions

diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index b896c5559524..d6e2bb49c59c 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -141,7 +141,7 @@ int snd_usb_endpoint_implict_feedback_sink(struct snd_usb_endpoint *ep)
  *
  * For implicit feedback, next_packet_size() is unused.
  */
-static int next_packet_size(struct snd_usb_endpoint *ep)
+int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep)
 {
         unsigned long flags;
         int ret;
@@ -177,15 +177,6 @@ static void retire_inbound_urb(struct snd_usb_endpoint *ep,
                 ep->retire_data_urb(ep->data_subs, urb);
 }
 
-static void prepare_outbound_urb_sizes(struct snd_usb_endpoint *ep,
-                                       struct snd_urb_ctx *ctx)
-{
-        int i;
-
-        for (i = 0; i < ctx->packets; ++i)
-                ctx->packet_size[i] = next_packet_size(ep);
-}
-
 /*
  * Prepare a PLAYBACK urb for submission to the bus.
  */
@@ -370,7 +361,6 @@ static void snd_complete_urb(struct urb *urb)
                         goto exit_clear;
                 }
 
-                prepare_outbound_urb_sizes(ep, ctx);
                 prepare_outbound_urb(ep, ctx);
         } else {
                 retire_inbound_urb(ep, ctx);
@@ -857,7 +847,6 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, int can_sleep)
                         goto __error;
 
                 if (usb_pipeout(ep->pipe)) {
-                        prepare_outbound_urb_sizes(ep, urb->context);
                         prepare_outbound_urb(ep, urb->context);
                 } else {
                         prepare_inbound_urb(ep, urb->context);
diff --git a/sound/usb/endpoint.h b/sound/usb/endpoint.h
index a8e60c1408e5..cbbbdf226d66 100644
--- a/sound/usb/endpoint.h
+++ b/sound/usb/endpoint.h
@@ -21,6 +21,7 @@ int  snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep);
 void snd_usb_endpoint_free(struct list_head *head);
 
 int snd_usb_endpoint_implict_feedback_sink(struct snd_usb_endpoint *ep);
+int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep);
 
 void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
                              struct snd_usb_endpoint *sender,
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 5ceb8f1d63fb..e80b6687f43a 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1029,6 +1029,7 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
                                  struct urb *urb)
 {
         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
+        struct snd_usb_endpoint *ep = subs->data_endpoint;
         struct snd_urb_ctx *ctx = urb->context;
         unsigned int counts, frames, bytes;
         int i, stride, period_elapsed = 0;
@@ -1040,7 +1041,11 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
         urb->number_of_packets = 0;
         spin_lock_irqsave(&subs->lock, flags);
         for (i = 0; i < ctx->packets; i++) {
-                counts = ctx->packet_size[i];
+                if (ctx->packet_size[i])
+                        counts = ctx->packet_size[i];
+                else
+                        counts = snd_usb_endpoint_next_packet_size(ep);
+
                 /* set up descriptor */
                 urb->iso_frame_desc[i].offset = frames * stride;
                 urb->iso_frame_desc[i].length = counts * stride;