x25: decrement netdev reference counts on unload
Apollon Oikonomopoulos [Tue, 7 Dec 2010 09:43:30 +0000 (09:43 +0000)]
x25 does not decrement the network device reference counts on module unload.
Thus unregistering any pre-existing interface after unloading the x25 module
hangs and results in

 unregister_netdevice: waiting for tap0 to become free. Usage count = 1

This patch decrements the reference counts of all interfaces in x25_link_free,
the way it is already done in x25_link_device_down for NETDEV_DOWN events.

Signed-off-by: Apollon Oikonomopoulos <apollon@noc.grnet.gr>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/x25/x25_link.c

index 73e7b95..b25c646 100644 (file)
@@ -394,6 +394,7 @@ void __exit x25_link_free(void)
        list_for_each_safe(entry, tmp, &x25_neigh_list) {
                nb = list_entry(entry, struct x25_neigh, node);
                __x25_remove_neigh(nb);
+               dev_put(nb->dev);
        }
        write_unlock_bh(&x25_neigh_list_lock);
 }