drm/mediatek: mtk_hdmi_v2: Fix return type of mtk_hdmi_v2_tmds_char_rate_valid()

When building with -Wincompatible-function-pointer-types-strict, a
warning designed to catch kernel control flow integrity (kCFI) issues at
build time, there is an instance in the new HDMI v2 drm/mediatek code:

  drivers/gpu/drm/mediatek/mtk_hdmi_v2.c:1331:31: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(const struct drm_bridge *, const struct drm_display_mode *, unsigned long long)' with an expression of type 'int (const struct drm_bridge *, const struct drm_display_mode *, unsigned long long)' [-Werror,-Wincompatible-function-pointer-types-strict]
   1331 |         .hdmi_tmds_char_rate_valid = mtk_hdmi_v2_hdmi_tmds_char_rate_valid,
        |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

While 'int' and 'enum drm_mode_status' are ABI compatible, hence no
regular warning from -Wincompatible-function-pointer-types, the mismatch
will trigger a kCFI violation when mtk_hdmi_v2_tmds_char_rate_valid() is
called indirectly.

Update the return type of mtk_hdmi_v2_tmds_char_rate_valid() to be 'enum
drm_mode_status' to clear up the warning and kCFI violation.

Fixes: 8d0f79886273 ("drm/mediatek: Introduce HDMI/DDC v2 for MT8195/MT8188")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20251125-drm-mediatek-hdmi-v2-wifpts-v1-1-a6c7582cf69a@kernel.org/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c b/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c
index c272e1e74b7de03a726402f77296b05c87b24e05..454b8b93b8342c4455afbc4f8ddd5d39db168069 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi_v2.c
@@ -1120,9 +1120,10 @@ static void mtk_hdmi_v2_hpd_disable(struct drm_bridge *bridge)
        mtk_hdmi_v2_disable(hdmi);
 }
 
-static int mtk_hdmi_v2_hdmi_tmds_char_rate_valid(const struct drm_bridge *bridge,
-                                                const struct drm_display_mode *mode,
-                                                unsigned long long tmds_rate)
+static enum drm_mode_status
+mtk_hdmi_v2_hdmi_tmds_char_rate_valid(const struct drm_bridge *bridge,
+                                     const struct drm_display_mode *mode,
+                                     unsigned long long tmds_rate)
 {
        if (mode->clock < MTK_HDMI_V2_CLOCK_MIN)
                return MODE_CLOCK_LOW;