 */
struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
{
	struct netdev_adjacent *upper;

	upper = list_first_or_null_rcu(&dev->adj_list.upper,
				       struct netdev_adjacent, list);
	if (upper && likely(upper->master))
		return upper->dev;
	return NULL;
Unknown