On Tue, Sep 13, 2022 at 01:56:00PM -0700, Nathan Huckleberry wrote:
> The mode_valid field in drm_connector_helper_funcs is expected to be of
> type
> enum drm_mode_status (* mode_valid) (struct drm_connector *connector,
> struct drm_display_mode *mode);
>
> The mismatched return type breaks forward edge kCFI since the underlying
> function definition does not match the function hook definition.
>
> The return type of zynqmp_dp_connector_mode_valid should be changed from
> int to enum drm_mode_status.
>
> Reported-by: Dan Carpenter <[email protected]>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1703
> Cc: [email protected]
> Signed-off-by: Nathan Huckleberry <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
> ---
> drivers/gpu/drm/xlnx/zynqmp_dp.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> index d14612b34796..f571b08d23d3 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> @@ -1352,8 +1352,9 @@ zynqmp_dp_connector_best_encoder(struct drm_connector *connector)
> return &dp->encoder;
> }
>
> -static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector,
> - struct drm_display_mode *mode)
> +static enum drm_mode_status
> +zynqmp_dp_connector_mode_valid(struct drm_connector *connector,
> + struct drm_display_mode *mode)
> {
> struct zynqmp_dp *dp = connector_to_dp(connector);
> u8 max_lanes = dp->link_config.max_lanes;
> --
> 2.37.2.789.g6183377224-goog
>