drm: writeback: Add missing cleanup in case of initialization failure

The current implementation of drm_writeback_connector initialization does
not properly clean up all resources in case of failure (allocated
properties and possible_encoders). Add this cleaning in case of failure.

Acked-by: Thomas Zimmermann <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Louis Chauvet <[e-mail]>

drivers/gpu/drm/drm_writeback.c

···
 }
 EXPORT_SYMBOL(drm_writeback_connector_init);
 
+static void delete_writeback_properties(struct drm_device *dev)
+{
+	if (dev->mode_config.writeback_pixel_formats_property) {
+		drm_property_destroy(dev, dev->mode_config.writeback_pixel_formats_property);
+		dev->mode_config.writeback_pixel_formats_property = NULL;
+	}
+	if (dev->mode_config.writeback_out_fence_ptr_property) {
+		drm_property_destroy(dev, dev->mode_config.writeback_out_fence_ptr_property);
+		dev->mode_config.writeback_out_fence_ptr_property = NULL;
+	}
+	if (dev->mode_config.writeback_fb_id_property) {
+		drm_property_destroy(dev, dev->mode_config.writeback_fb_id_property);
+		dev->mode_config.writeback_fb_id_property = NULL;
+	}
+}
+
 /**
  * drm_writeback_connector_init_with_encoder - Initialize a writeback connector with
  * a custom encoder
···
 	int ret = create_writeback_properties(dev);
 
 	if (ret != 0)
-		return ret;
+		goto failed_properties;
 
 	connector->interlace_allowed = 0;
 
 	ret = drm_connector_attach_encoder(connector, enc);
 	if (ret)
-		return ret;
+		goto failed_properties;
 
 	blob = drm_property_create_blob(dev, n_formats * sizeof(*formats),
 					formats);
-	if (IS_ERR(blob))
-		return PTR_ERR(blob);
+	if (IS_ERR(blob)) {
+		ret = PTR_ERR(blob);
+		goto failed_properties;
+	}
 
 	INIT_LIST_HEAD(&wb_connector->job_queue);
 	spin_lock_init(&wb_connector->job_lock);
···
 	wb_connector->pixel_formats_blob_ptr = blob;
 
 	return 0;
+failed_properties:
+	delete_writeback_properties(dev);
+	return ret;
 }
 
 /**