Re: [PATCH] drm/vmwgfx: Fix vmw_du_cursor_plane_atomic_check

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Mar 27, 2018 at 04:26:17PM +0200, Thomas Hellstrom wrote:
> Use the correct helper and also return early on helper
> success rather than on helper failure.
> 
> Also explicitly return 0 in the case of no fb.
> 
> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Reported-by: Daniel Vetter <daniel@ffwll.ch>
> ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> index 3628a9fe705f..0f7dc9ea2657 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> @@ -494,23 +494,23 @@ int vmw_du_cursor_plane_atomic_check(struct drm_plane *plane,
>  				     struct drm_plane_state *new_state)
>  {
>  	int ret = 0;
> +	struct drm_crtc_state *crtc_state = NULL;
>  	struct vmw_surface *surface = NULL;
>  	struct drm_framebuffer *fb = new_state->fb;
>  
> -	struct drm_rect src = drm_plane_state_src(new_state);
> -	struct drm_rect dest = drm_plane_state_dest(new_state);
> -
>  	/* Turning off */
>  	if (!fb)
> -		return ret;
> +		return 0;

This should probably be checked after
drm_atomic_helper_check_plane_state() has been called. Otherwise
new_state->visible may be left with a stale value.

>  
> -	ret = drm_plane_helper_check_update(plane, new_state->crtc, fb,
> -					    &src, &dest,
> -					    DRM_MODE_ROTATE_0,
> -					    DRM_PLANE_HELPER_NO_SCALING,
> -					    DRM_PLANE_HELPER_NO_SCALING,
> -					    true, true, &new_state->visible);
> -	if (!ret)
> +	if (new_state->crtc)
> +		crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
> +							   new_state->crtc);
> +
> +	ret = drm_atomic_helper_check_plane_state(new_state, crtc_state,
> +						  DRM_PLANE_HELPER_NO_SCALING,
> +						  DRM_PLANE_HELPER_NO_SCALING,
> +						  true, true);
> +	if (ret)
>  		return ret;
>  
>  	/* A lot of the code assumes this */
> -- 
> 2.14.3
> 
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-- 
Ville Syrjälä
Intel OTC
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