[PATCH 5/5] drm/mediatek: Fix dereference before null check

[Jason-JH.Lin]

Null-checking state suggests that it may be null, but it has already
been dereferenced on drm_atomic_get_new_plane_state(state, plane).

The parameter state will never be NULL currently, so just remove the
state is NULL flow in this function.

Signed-off-by: Jason-JH.Lin <jason-jh.lin at mediatek.com>
Fixes: 5ddb0bd4ddc3 ("drm/atomic: Pass the full state to planes async atomic check and update")
---
 drivers/gpu/drm/mediatek/mtk_drm_plane.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
index a1337f386bbf..e14b2920d242 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
@@ -103,8 +103,7 @@ static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
 static int mtk_plane_atomic_async_check(struct drm_plane *plane,
 					struct drm_atomic_state *state)
 {
-	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
-										 plane);
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
 	struct drm_crtc_state *crtc_state;
 	int ret;
 
@@ -122,11 +121,7 @@ static int mtk_plane_atomic_async_check(struct drm_plane *plane,
 	if (ret)
 		return ret;
 
-	if (state)
-		crtc_state = drm_atomic_get_existing_crtc_state(state,
-								new_plane_state->crtc);
-	else /* Special case for asynchronous cursor updates. */
-		crtc_state = new_plane_state->crtc->state;
+	crtc_state = drm_atomic_get_existing_crtc_state(state, new_plane_state->crtc);
 
 	return drm_atomic_helper_check_plane_state(plane->state, crtc_state,
 						   DRM_PLANE_NO_SCALING,
-- 
2.18.0