drm/exynos: Fix potential NULL pointer dereference in exynos_drm_encoder.c

Check overlay_ops is not NULL as checked in the previous 'if' condition.
Fixes the following smatch error:
drivers/gpu/drm/exynos/exynos_drm_encoder.c:509 exynos_drm_encoder_plane_disable()
error: we previously assumed 'overlay_ops' could be null (see line 499)

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_encoder.c b/drivers/gpu/drm/exynos/exynos_drm_encoder.c
index 607231a..f2df06c 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_encoder.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_encoder.c
@@ -513,6 +513,6 @@ void exynos_drm_encoder_plane_disable(struct drm_encoder *encoder, void *data)
         * because the setting for disabling the overlay will be updated
         * at vsync.
         */
-       if (overlay_ops->wait_for_vblank)
+       if (overlay_ops && overlay_ops->wait_for_vblank)
                overlay_ops->wait_for_vblank(manager->dev);
 }