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-rw-r--r--sound/usb/endpoint.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index f487d26f8d40..21049b882ee6 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -1018,15 +1018,18 @@ void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
/*
* Iterate through the inbound packet and prepare the lengths
* for the output packet. The OUT packet we are about to send
- * will have the same amount of payload bytes than the IN
- * packet we just received.
+ * will have the same amount of payload bytes per stride as the
+ * IN packet we just received. Since the actual size is scaled
+ * by the stride, use the sender stride to calculate the length
+ * in case the number of channels differ between the implicitly
+ * fed-back endpoint and the synchronizing endpoint.
*/
out_packet->packets = in_ctx->packets;
for (i = 0; i < in_ctx->packets; i++) {
if (urb->iso_frame_desc[i].status == 0)
out_packet->packet_size[i] =
- urb->iso_frame_desc[i].actual_length / ep->stride;
+ urb->iso_frame_desc[i].actual_length / sender->stride;
else
out_packet->packet_size[i] = 0;
}