The field mode_valid in exynos_drm_crtc_ops is expected to be of type
enum drm_mode_status (*mode_valid)(struct exynos_drm_crtc *crtc,
const struct drm_display_mode *mode);
Likewise for mode_valid in drm_connector_helper_funcs.
The mismatched return type breaks forward edge kCFI since the underlying
function definition does not match the function hook definition.
The return type of mixer_mode_valid and hdmi_mode_valid should be
changed from int to enum drm_mode_status.
Reported-by: Dan Carpenter <error27@xxxxxxxxx>
Link: https://github.com/ClangBuiltLinux/linux/issues/1703
Cc: llvm@xxxxxxxxxxxxxxx
Signed-off-by: Nathan Huckleberry <nhuck@xxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_hdmi.c | 4 ++--
drivers/gpu/drm/exynos/exynos_mixer.c | 5 +++--
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 10b0036f8a2e..8453359c92e8 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -922,8 +922,8 @@ static int hdmi_find_phy_conf(struct hdmi_context *hdata, u32 pixel_clock)
return -EINVAL;
}
-static int hdmi_mode_valid(struct drm_connector *connector,
- struct drm_display_mode *mode)
+static enum drm_mode_status hdmi_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
{
struct hdmi_context *hdata = connector_to_hdmi(connector);
int ret;
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 65260a658684..82f676e6d21b 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -1045,8 +1045,9 @@ static void mixer_atomic_disable(struct exynos_drm_crtc *crtc)
clear_bit(MXR_BIT_POWERED, &ctx->flags);
}
-static int mixer_mode_valid(struct exynos_drm_crtc *crtc,
- const struct drm_display_mode *mode)
+static enum drm_mode_status
+mixer_mode_valid(struct exynos_drm_crtc *crtc,
+ const struct drm_display_mode *mode)
{
struct mixer_context *ctx = crtc->ctx;
u32 w = mode->hdisplay, h = mode->vdisplay;
--
2.37.2.789.g6183377224-goog
