bridge: fix hang on removal of bridge via netlink

Need to cleanup bridge device timers and ports when being bridge
device is being removed via netlink.

This fixes the problem of observed when doing:
 ip link add br0 type bridge
 ip link set dev eth1 master br0
 ip link set br0 up
 ip link del br0

which would cause br0 to hang in unregister_netdev because
of leftover reference count.

Reported-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index e73815456adf2763f72d15ee649e2a3b1d6052a5..1d420f64ff270b812ec206088d85c43b255a954f 100644 (file)
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -161,9 +161,10 @@ static void del_nbp(struct net_bridge_port *p)
        call_rcu(&p->rcu, destroy_nbp_rcu);
 }
 
-/* called with RTNL */
-static void del_br(struct net_bridge *br, struct list_head *head)
+/* Delete bridge device */
+void br_dev_delete(struct net_device *dev, struct list_head *head)
 {
+       struct net_bridge *br = netdev_priv(dev);
        struct net_bridge_port *p, *n;
 
        list_for_each_entry_safe(p, n, &br->port_list, list) {
@@ -268,7 +269,7 @@ int br_del_bridge(struct net *net, const char *name)
        }
 
        else
-               del_br(netdev_priv(dev), NULL);
+               br_dev_delete(dev, NULL);
 
        rtnl_unlock();
        return ret;
@@ -449,7 +450,7 @@ void __net_exit br_net_exit(struct net *net)
        rtnl_lock();
        for_each_netdev(net, dev)
                if (dev->priv_flags & IFF_EBRIDGE)
-                       del_br(netdev_priv(dev), &list);
+                       br_dev_delete(dev, &list);
 
        unregister_netdevice_many(&list);
        rtnl_unlock();

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 5b1ed1ba9aa7bd52a811eb3dbc2ca76d2a2050ac..e5f9ece3c9a0f9637c8ad98382b88705b27e1d30 100644 (file)
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -210,6 +210,7 @@ static struct rtnl_link_ops br_link_ops __read_mostly = {
        .priv_size      = sizeof(struct net_bridge),
        .setup          = br_dev_setup,
        .validate       = br_validate,
+       .dellink        = br_dev_delete,
 };
 
 int __init br_netlink_init(void)

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 78cc364997d9888bc4a1e9869c7c64edb6378ee9..857a021deea9fb6b1d2351fe7a8d3b5d84667947 100644 (file)
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -294,6 +294,7 @@ static inline int br_is_root_bridge(const struct net_bridge *br)
 
 /* br_device.c */
 extern void br_dev_setup(struct net_device *dev);
+extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
                               struct net_device *dev);
 #ifdef CONFIG_NET_POLL_CONTROLLER