netdev_has_any_upper_dev
if (netdev_has_any_upper_dev(upper)) {
if (netdev_has_any_upper_dev(upper_dev) &&
if (netdev_has_any_upper_dev(upper_dev) &&
bool netdev_has_any_upper_dev(struct net_device *dev);
WARN_ON(netdev_has_any_upper_dev(dev));
EXPORT_SYMBOL(netdev_has_any_upper_dev);