drm: make sure visible is set to false if fb is null

We can't let visible set true while the fb is null, some places of
the code only check for visible to base its decisions.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index 827ec1a3040b202fc025a9d1b8af54e32b67726f..fe4d1fb2376cd488d22974a2710d2b2571fb6122 100644 (file)
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/drivers/gpu/drm/drm_plane_helper.c
@@ -127,6 +127,11 @@ int drm_plane_helper_check_update(struct drm_plane *plane,
                return -ERANGE;
        }
 
+       if (!fb) {
+               *visible = false;
+               return 0;
+       }
+
        *visible = drm_rect_clip_scaled(src, dest, clip, hscale, vscale);
        if (!*visible)
                /*