usb: gadget: uvc: Add missing call for additional setup data

Some UVC commands require additional data (non zero uvc->event_length).
Add usb_ep_queue() call, so uvc_function_ep0_complete() can be called
and send received data to the userspace.

Signed-off-by: Petr Cvek <petr.cvek@tul.cz>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/function/f_uvc.c

@@ -258,6 +258,13 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 	memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
 	v4l2_event_queue(&uvc->vdev, &v4l2_event);
 
+	/* Pass additional setup data to userspace */
+	if (uvc->event_setup_out && uvc->event_length) {
+		uvc->control_req->length = uvc->event_length;
+		return usb_ep_queue(uvc->func.config->cdev->gadget->ep0,
+			uvc->control_req, GFP_ATOMIC);
+	}
+
 	return 0;
 }