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 e738154..1d420f6 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -161,9 +161,10 @@
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 @@
}
else
- del_br(netdev_priv(dev), NULL);
+ br_dev_delete(dev, NULL);
rtnl_unlock();
return ret;
@@ -449,7 +450,7 @@
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 5b1ed1b..e5f9ece3 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -210,6 +210,7 @@
.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 78cc364..857a021 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -294,6 +294,7 @@
/* 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