On Fri, Oct 17, 2025 at 07:03:33PM +0300, Dan Carpenter wrote:
> The drm_atomic_get_crtc_state() function never returns NULL, it returns
> error pointers. Update the error checking to match.
>
> Fixes: cb71de092553 ("drm/sysfb: Lookup blit function during atomic check")
> Signed-off-by: Dan Carpenter <[email protected]>
> ---
> drivers/gpu/drm/sysfb/drm_sysfb_modeset.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c
> b/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c
> index 8517c490e815..d2c4d8f3d4d0 100644
> --- a/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c
> +++ b/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c
> @@ -259,7 +259,7 @@ int drm_sysfb_plane_helper_begin_fb_access(struct
> drm_plane *plane,
> ret = -EINVAL;
>
> crtc_state = drm_atomic_get_crtc_state(plane_state->state,
> plane_state->crtc);
Looking at where this gets called, that should be
drm_atomic_get_new_crtc_state(). Either that or the
code is more seriously borked.
I'll send out a patch that warns about invalid use of
*_get_state()...
> - if (drm_WARN_ON_ONCE(dev, !crtc_state))
> + if (drm_WARN_ON_ONCE(dev, IS_ERR(crtc_state)))
> goto err_drm_gem_end_shadow_fb_access;
> sysfb_crtc_state = to_drm_sysfb_crtc_state(crtc_state);
>
> --
> 2.51.0
--
Ville Syrjälä
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