[34-longterm 151/209] x25: decrement netdev reference counts on unload

From: Paul Gortmaker
Date: Thu Apr 14 2011 - 14:14:34 EST

From: Apollon Oikonomopoulos <apollon@xxxxxxxxxxxx>

| This is a commit scheduled for the next v2.6.34 longterm release. |
| If you see a problem with using this for longterm, please comment.|

commit 171995e5d82dcc92bea37a7d2a2ecc21068a0f19 upstream

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@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
net/x25/x25_link.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c
index 73e7b95..b25c646 100644
--- a/net/x25/x25_link.c
+++ b/net/x25/x25_link.c
@@ -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);
+ dev_put(nb->dev);

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