This is a preparation patch. A future helper will remove the selector
argument and use the information embedded in the uvc_control structure.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index aa9de84de9236540c46ee78fb8458873d503786e..98e454fcdeb2ee36d334068fd750e6203931699d 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2720,7 +2720,8 @@ static void uvc_ctrl_fixup_xu_info(struct uvc_device *dev,
  * Query control information (size and flags) for XU controls.
  */
 static int uvc_ctrl_fill_xu_info(struct uvc_device *dev,
-	const struct uvc_control *ctrl, struct uvc_control_info *info)
+				 struct uvc_control *ctrl,
+				 struct uvc_control_info *info)
 {
 	u8 *data;
 	int ret;
@@ -2733,6 +2734,9 @@ static int uvc_ctrl_fill_xu_info(struct uvc_device *dev,
 	info->index = ctrl->index;
 	info->selector = ctrl->index + 1;
 
+	/* We need to fill info.selector to get the flags and the length. */
+	ctrl->info.selector = info->selector;
+
 	/* Query and verify the control length (GET_LEN) */
 	ret = uvc_query_ctrl(dev, UVC_GET_LEN, ctrl->entity->id, dev->intfnum,
 			     info->selector, data, 2);

-- 
2.51.0.536.g15c5d4f767-goog