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x25: decrement netdev reference counts on unload

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[ Upstream commit 171995e5d8]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Apollon Oikonomopoulos 2010-12-07 09:43:30 +00:00 committed by Greg Kroah-Hartman
parent 0f8465525b
commit b54eef07c1
1 changed files with 1 additions and 0 deletions
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1
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) {
nb = list_entry(entry, struct x25_neigh, node);
__x25_remove_neigh(nb);
dev_put(nb->dev);
}
write_unlock_bh(&x25_neigh_list_lock);
}