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 83896ecab0bbaf895da83abc7ec9725cd4a8ccdd..abb7fb7b6f52a9886126a28b07a34c3d8e7a7405 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -10213,11 +10213,15 @@ static bool parse_edid_cea(struct amdgpu_dm_connector *aconnector,
 		struct amdgpu_hdmi_vsdb_info *vsdb_info)
 {
 	struct amdgpu_device *adev = drm_to_adev(aconnector->base.dev);
+	bool ret;
 
+	mutex_lock(&adev->dm.dc_lock);
 	if (adev->dm.dmub_srv)
-		return parse_edid_cea_dmub(&adev->dm, edid_ext, len, vsdb_info);
+		ret = parse_edid_cea_dmub(&adev->dm, edid_ext, len, vsdb_info);
 	else
-		return parse_edid_cea_dmcu(&adev->dm, edid_ext, len, vsdb_info);
+		ret = parse_edid_cea_dmcu(&adev->dm, edid_ext, len, vsdb_info);
+	mutex_unlock(&adev->dm.dc_lock);
+	return ret;
 }
 
 static int parse_hdmi_amd_vsdb(struct amdgpu_dm_connector *aconnector,