[IPV6] IP6TUNNEL: Delete all tunnel device when unloading module.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

net/ipv6/ip6_tunnel.c

@@ -1149,6 +1149,20 @@ static int __init ip6_tunnel_init(void)
 	return err;
 }
 
+static void __exit ip6ip6_destroy_tunnels(void)
+{
+	int h;
+	struct ip6_tnl *t;
+
+	for (h = 0; h < HASH_SIZE; h++) {
+		while ((t = tnls_r_l[h]) != NULL)
+			unregister_netdevice(t->dev);
+	}
+
+	t = tnls_wc[0];
+	unregister_netdevice(t->dev);
+}
+
 /**
  * ip6_tunnel_cleanup - free resources and unregister protocol
  **/
@@ -1158,7 +1172,9 @@ static void __exit ip6_tunnel_cleanup(void)
 	if (xfrm6_tunnel_deregister(&ip6ip6_handler))
 		printk(KERN_INFO "ip6ip6 close: can't deregister tunnel\n");
 
-	unregister_netdev(ip6ip6_fb_tnl_dev);
+	rtnl_lock();
+	ip6ip6_destroy_tunnels();
+	rtnl_unlock();
 }
 
 module_init(ip6_tunnel_init);