[RESEND,V2] drm: fsl-dcu: Fix no fb check bug

[Meng Yi]

For state->fb or state->crtc may be NULL in fsl_dcu_drm_plane_atomic_check
function, if so, return 0.

Signed-off-by: Meng Yi <meng.yi at nxp.com>
Signed-off-by: Jianwei Wang <jianwei.wang.chn at gmail.com>

---

change in v2:
-Add state->crtc check
-return 0 when state->fb or state->crtc is NULL, instead of -EINVAL
Adviced by Daniel Stone

 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
index 4b13cf9..8965580 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
@@ -41,6 +41,9 @@ static int fsl_dcu_drm_plane_atomic_check(struct drm_plane *plane,
 {
 	struct drm_framebuffer *fb = state->fb;
 
+	if (!state->fb || !state->crtc)
+		return 0;
+
 	switch (fb->pixel_format) {
 	case DRM_FORMAT_RGB565:
 	case DRM_FORMAT_RGB888:
@@ -85,9 +88,6 @@ static void fsl_dcu_drm_plane_atomic_update(struct drm_plane *plane,
 	unsigned int alpha, bpp;
 	int index, ret;
 
-	if (!fb)
-		return;
-
 	index = fsl_dcu_drm_plane_index(plane);
 	if (index < 0)
 		return;
-- 
2.1.0.27.g96db324