drm: plane: Clear plane.crtc and plane.fb after disable_plane()

These are the only indication to user space that the plane was disabled.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e05d99791544..d9bf9d88ff43 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1684,6 +1684,8 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
         /* No fb means shut it down */
         if (!plane_req->fb_id) {
                 plane->funcs->disable_plane(plane);
+                plane->crtc = NULL;
+                plane->fb = NULL;
                 goto out;
         }