diff --git a/[refs] b/[refs]
index ffc407c99e99..4a5567ffebc7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 5fb4d2525b6dcffbb8bc26a7dfc7ed17ad323a06
+refs/heads/master: 749d00dbf154fc2f9ac59df669205039de0d5b45
diff --git a/trunk/drivers/staging/rspiusb/rspiusb.c b/trunk/drivers/staging/rspiusb/rspiusb.c
index 2f8155c1968b..04e2f92c0f62 100644
--- a/trunk/drivers/staging/rspiusb/rspiusb.c
+++ b/trunk/drivers/staging/rspiusb/rspiusb.c
@@ -716,6 +716,8 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx)
 		pdx->PixelUrb[frameInfo][i]->transfer_flags =
 		    URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT;
 	}
+	if (i == 0)
+		return -EINVAL;
 	/* only interrupt when last URB completes */
 	pdx->PixelUrb[frameInfo][--i]->transfer_flags &= ~URB_NO_INTERRUPT;
 	pdx->pendedPixelUrbs[frameInfo] =