drm/virtio: plane: use drm managed resources

Use drm managed resource allocation (drmm_universal_plane_alloc()) in
order to cleanup/simplify drm plane .destroy callback.
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20220714130028.2127858-2-dakr@redhat.comSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_plane.c

@@ -67,16 +67,10 @@ uint32_t virtio_gpu_translate_format(uint32_t drm_fourcc)
 	return format;
 }
 
-static void virtio_gpu_plane_destroy(struct drm_plane *plane)
-{
-	drm_plane_cleanup(plane);
-	kfree(plane);
-}
-
 static const struct drm_plane_funcs virtio_gpu_plane_funcs = {
 	.update_plane		= drm_atomic_helper_update_plane,
 	.disable_plane		= drm_atomic_helper_disable_plane,
-	.destroy		= virtio_gpu_plane_destroy,
+	.destroy		= drm_plane_cleanup,
 	.reset			= drm_atomic_helper_plane_reset,
 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
@@ -379,11 +373,7 @@ struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev,
 	const struct drm_plane_helper_funcs *funcs;
 	struct drm_plane *plane;
 	const uint32_t *formats;
-	int ret, nformats;
-
-	plane = kzalloc(sizeof(*plane), GFP_KERNEL);
-	if (!plane)
-		return ERR_PTR(-ENOMEM);
+	int nformats;
 
 	if (type == DRM_PLANE_TYPE_CURSOR) {
 		formats = virtio_gpu_cursor_formats;
@@ -394,17 +384,13 @@ struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev,
 		nformats = ARRAY_SIZE(virtio_gpu_formats);
 		funcs = &virtio_gpu_primary_helper_funcs;
 	}
-	ret = drm_universal_plane_init(dev, plane, 1 << index,
-				       &virtio_gpu_plane_funcs,
-				       formats, nformats,
-				       NULL, type, NULL);
-	if (ret)
-		goto err_plane_init;
 
-	drm_plane_helper_add(plane, funcs);
+	plane = drmm_universal_plane_alloc(dev, struct drm_plane, dev,
+					   1 << index, &virtio_gpu_plane_funcs,
+					   formats, nformats, NULL, type, NULL);
+	if (IS_ERR(plane))
 		return plane;
 
-err_plane_init:
-	kfree(plane);
-	return ERR_PTR(ret);
+	drm_plane_helper_add(plane, funcs);
+	return plane;
 }