[PATCH 09/21] drm/amd/display: Fix potential nullptr error

[sunpeng.li at amd.com]

From: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>

[Why]
Fix surface/plane potential nullptr

[How]
add null check

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 492230c..84201f4 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5321,6 +5321,12 @@ enum surface_update_type dm_determine_update_type_for_commit(struct dc *dc, stru
 	struct dc_stream_update stream_update;
 	enum surface_update_type update_type = UPDATE_TYPE_FAST;
 
+	if (!updates || !surface) {
+		DRM_ERROR("Plane or surface update failed to allocate");
+		/* Set type to FULL to avoid crashing in DC*/
+		update_type = UPDATE_TYPE_FULL;
+		goto ret;
+	}
 
 	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
 		new_dm_crtc_state = to_dm_crtc_state(new_crtc_state);
-- 
2.7.4