usb: gadget: uvc: fix dropped frame after missed isoc

With the re-use of the previous completion status in 0d1c407
("usb: dwc3: gadget: Return proper request status") it could be possible
that the next frame would also get dropped if the current frame has a
missed isoc error. Ensure that an interrupt is requested for the start
of a new frame.

Fixes: fc78941 ("usb: gadget: uvc: decrease the interrupt load to a quarter")
Cc: <[email protected]>
Signed-off-by: Dan Vacura <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Dan Vacura

drivers/usb/gadget/function/uvc_video.c

@@ -431,7 +431,8 @@ static void uvcg_video_pump(struct work_struct *work)
 
 		/* Endpoint now owns the request */
 		req = NULL;
-		video->req_int_count++;
+		if (buf->state != UVC_BUF_STATE_DONE)
+			video->req_int_count++;
 	}
 
 	if (!req)