static int ipv6_mc_netdev_event(struct notifier_block *this,
				unsigned long event,
				void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct inet6_dev *idev = __in6_dev_get(dev);

	switch (event) {
	case NETDEV_RESEND_IGMP:
		if (idev)
			ipv6_mc_rejoin_groups(idev);
		break;
	default:
		break;
	}

	return NOTIFY_DONE;
}
static int ipv6_mc_netdev_event(struct notifier_block *this,
				unsigned long event,
				void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct inet6_dev *idev = __in6_dev_get(dev);

	switch (event) {
	case NETDEV_RESEND_IGMP:
		if (idev)
			ipv6_mc_rejoin_groups(idev);
		break;
	default:
		break;
	}

	return NOTIFY_DONE;
}