Since the uvc gadget is depending on the completion handler to
properly enqueue new data, we have to ensure that the requeue mechanism
is always working. To be safe we always create an interrupt
on zero length requests.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>

---
v1 -> v3: new patch
---
 drivers/usb/gadget/function/uvc_video.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index d41f5f31dadd5..03bff39cd4902 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -303,6 +303,7 @@ static int uvcg_video_usb_req_queue(struct uvc_video *video,
 		 *   between latency and interrupt load.
 		 */
 		if (list_empty(&video->req_free) || ureq->last_buf ||
+				!req->length ||
 			!(video->req_int_count %
 			DIV_ROUND_UP(video->uvc_num_requests, 4))) {
 			video->req_int_count = 0;

-- 
2.39.2