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The v4l2_subdev_link_validate() function is a helper designed to validate links whose sink is a subdev. When called on a link whose sink is a video device, it only prints a warning and returns. Its usage in the sun4i_csi driver is wrong, leaving the link from the sub4i_csi subdev to the capture video device unvalidated. Planned improvements to the v4l2_subdev_link_validate() function will turn the warning into an error, breaking the sun4i_csi driver. As an interim measure, move the warning to the sun4i_csi driver in a custom validation handler, and drop the call to the helper. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: Chen-Yu Tsai <wens@csie.org> Reviewed-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>