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bridge: fix hang on removal of bridge via netlink

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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>
This commit is contained in:
stephen hemminger 2011-10-06 11:19:41 +00:00 committed by David S. Miller
parent ae2a458315
commit 1ce5cce895
3 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
net/bridge/br_if.c
View File

@ -161,9 +161,10 @@ static void del_nbp(struct net_bridge_port *p)
call_rcu(&p->rcu, destroy_nbp_rcu); call_rcu(&p->rcu, destroy_nbp_rcu);
} }
/* called with RTNL */ /* Delete bridge device */
static void del_br(struct net_bridge *br, struct list_head *head) 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; struct net_bridge_port *p, *n;
list_for_each_entry_safe(p, n, &br->port_list, list) { 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 else
del_br(netdev_priv(dev), NULL); br_dev_delete(dev, NULL);
rtnl_unlock(); rtnl_unlock();
return ret; return ret;
@ -449,7 +450,7 @@ void __net_exit br_net_exit(struct net *net)
rtnl_lock(); rtnl_lock();
for_each_netdev(net, dev) for_each_netdev(net, dev)
if (dev->priv_flags & IFF_EBRIDGE) if (dev->priv_flags & IFF_EBRIDGE)
del_br(netdev_priv(dev), &list); br_dev_delete(dev, &list);
unregister_netdevice_many(&list); unregister_netdevice_many(&list);
rtnl_unlock(); rtnl_unlock();

1
net/bridge/br_netlink.c
View File

@ -210,6 +210,7 @@ static struct rtnl_link_ops br_link_ops __read_mostly = {
.priv_size = sizeof(struct net_bridge), .priv_size = sizeof(struct net_bridge),
.setup = br_dev_setup, .setup = br_dev_setup,
.validate = br_validate, .validate = br_validate,
.dellink = br_dev_delete,
}; };
int __init br_netlink_init(void) int __init br_netlink_init(void)

1
net/bridge/br_private.h
View File

@ -294,6 +294,7 @@ static inline int br_is_root_bridge(const struct net_bridge *br)
/* br_device.c */ /* br_device.c */
extern void br_dev_setup(struct net_device *dev); 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, extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
struct net_device *dev); struct net_device *dev);
#ifdef CONFIG_NET_POLL_CONTROLLER #ifdef CONFIG_NET_POLL_CONTROLLER