unregister_netdev(ipip6_fb_tunnel_dev); 
 rtnl_lock(); sit_destroy_tunnels(); unregister_netdevice(ipip6_fb_tunnel_dev); rtnl_unlock(); 
void __exit sit_cleanup(void){	inet_del_protocol(&sit_protocol, IPPROTO_IPV6);	unregister_netdev(ipip6_fb_tunnel_dev);}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/db44575f6fd55df6ff67ddd21f7ad5be5a741136/sit.c/buggy/net/ipv6/sit.c