From cec9e59cae6071e58140baf54e47c00aaa39851b Mon Sep 17 00:00:00 2001 From: Nathan Huckleberry Date: Tue, 8 Nov 2022 17:14:25 -0700 Subject: [PATCH] drm: xlnx: Fix return type of zynqmp_dp_bridge_mode_valid The mode_valid field in drm_bridge_helper_funcs is expected to be of type enum drm_mode_status (* mode_valid) (struct drm_bridge *bridge, 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. A new warning in clang will catch this at compile time: drivers/gpu/drm/xlnx/zynqmp_dp.c:1573:16: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(struct drm_bridge *, const struct drm_display_info *, const struct drm_display_mode *)' with an expression of type 'int (struct drm_bridge *, const struct drm_display_info *, const struct drm_display_mode *)' [-Werror,-Wincompatible-function-pointer-types-strict] .mode_valid = zynqmp_dp_bridge_mode_valid, ^~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 error generated. The return type of zynqmp_dp_bridge_mode_valid should be changed from int to enum drm_mode_status. Reported-by: Dan Carpenter Link: https://github.com/ClangBuiltLinux/linux/issues/1703 Link: https://github.com/ClangBuiltLinux/linux/issues/1750 Signed-off-by: Nathan Huckleberry Reviewed-by: Laurent Pinchart [nathan: Rebase on drm-misc-next and fix conflicts Add note about new clang warning] Signed-off-by: Nathan Chancellor Signed-off-by: Laurent Pinchart --- drivers/gpu/drm/xlnx/zynqmp_dp.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c index 7c9ae167eac7b..0a7b466446fb6 100644 --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -1362,9 +1362,10 @@ static void zynqmp_dp_bridge_detach(struct drm_bridge *bridge) zynqmp_dp_aux_cleanup(dp); } -static int zynqmp_dp_bridge_mode_valid(struct drm_bridge *bridge, - const struct drm_display_info *info, - const struct drm_display_mode *mode) +static enum drm_mode_status +zynqmp_dp_bridge_mode_valid(struct drm_bridge *bridge, + const struct drm_display_info *info, + const struct drm_display_mode *mode) { struct zynqmp_dp *dp = bridge_to_dp(bridge); int rate; -- 2.30.2