V4L/DVB: uvcvideo: Blacklist gain control for Asus EeePC T91 integrated webcam

The Asus EeePC T91 integrated webcam exposes a gain control in the
processing unit but stalls when the control is queried. Blacklist the
gain control for that camera.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/uvc/uvc_ctrl.c

@@ -1433,6 +1433,7 @@ uvc_ctrl_prune_entity(struct uvc_device *dev, struct uvc_entity *entity)
 		struct usb_device_id id;
 		u8 index;
 	} blacklist[] = {
+		{ { USB_DEVICE(0x13d3, 0x509b) }, 9 }, /* Gain */
 		{ { USB_DEVICE(0x1c4f, 0x3000) }, 6 }, /* WB Temperature */
 		{ { USB_DEVICE(0x5986, 0x0241) }, 2 }, /* Hue */
 	};