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x25: decrement netdev reference counts on unload 

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>
This commit is contained in:
Apollon Oikonomopoulos 2010-12-07 09:43:30 +00:00 committed by David S. Miller
parent 408cc293c2
commit 171995e5d8
1 changed files with 1 additions and 0 deletions
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net/x25/x25_link.c
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@ -394,6 +394,7 @@ void __exit x25_link_free(void)
list_for_each_safe(entry, tmp, &x25_neigh_list) { list_for_each_safe(entry, tmp, &x25_neigh_list) {
nb = list_entry(entry, struct x25_neigh, node); nb = list_entry(entry, struct x25_neigh, node);
__x25_remove_neigh(nb); __x25_remove_neigh(nb);
dev_put(nb->dev);
} }
write_unlock_bh(&x25_neigh_list_lock); write_unlock_bh(&x25_neigh_list_lock);
} }