On Tue, Sep 13, 2022 at 01:54:49PM -0700, Nathan Huckleberry wrote: > 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> Reviewed-by: Nathan Chancellor <nathan@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 >
