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authorAmerigo Wang <amwang@redhat.com>2010-03-31 21:30:52 +0000
committerDavid S. Miller <davem@davemloft.net>2010-04-01 17:26:01 -0700
commit9e2e61fbf8ad016d24e4af0afff13505f3dd2a2a (patch)
treee469e69cc59b860713ac18227932c017a739564f /drivers/net
parent6503d96168f891ffa3b70ae6c9698a1a722025a0 (diff)
downloadop-kernel-dev-9e2e61fbf8ad016d24e4af0afff13505f3dd2a2a.zip
op-kernel-dev-9e2e61fbf8ad016d24e4af0afff13505f3dd2a2a.tar.gz
bonding: fix potential deadlock in bond_uninit()
bond_uninit() is invoked with rtnl_lock held, when it does destroy_workqueue() which will potentially flush all works in this workqueue, if we hold rtnl_lock again in the work function, it will deadlock. So move destroy_workqueue() to destructor where rtnl_lock is not held any more, suggested by Eric. Signed-off-by: WANG Cong <amwang@redhat.com> Cc: Jay Vosburgh <fubar@us.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: Jiri Pirko <jpirko@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/bonding/bond_main.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 5972a52..0075514 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4450,6 +4450,14 @@ static const struct net_device_ops bond_netdev_ops = {
.ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
};
+static void bond_destructor(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ if (bond->wq)
+ destroy_workqueue(bond->wq);
+ free_netdev(bond_dev);
+}
+
static void bond_setup(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
@@ -4470,7 +4478,7 @@ static void bond_setup(struct net_device *bond_dev)
bond_dev->ethtool_ops = &bond_ethtool_ops;
bond_set_mode_ops(bond, bond->params.mode);
- bond_dev->destructor = free_netdev;
+ bond_dev->destructor = bond_destructor;
/* Initialize the device options */
bond_dev->tx_queue_len = 0;
@@ -4542,9 +4550,6 @@ static void bond_uninit(struct net_device *bond_dev)
bond_remove_proc_entry(bond);
- if (bond->wq)
- destroy_workqueue(bond->wq);
-
netif_addr_lock_bh(bond_dev);
bond_mc_list_destroy(bond);
netif_addr_unlock_bh(bond_dev);
@@ -4956,8 +4961,8 @@ int bond_create(struct net *net, const char *name)
bond_setup);
if (!bond_dev) {
pr_err("%s: eek! can't alloc netdev!\n", name);
- res = -ENOMEM;
- goto out;
+ rtnl_unlock();
+ return -ENOMEM;
}
dev_net_set(bond_dev, net);
@@ -4966,19 +4971,16 @@ int bond_create(struct net *net, const char *name)
if (!name) {
res = dev_alloc_name(bond_dev, "bond%d");
if (res < 0)
- goto out_netdev;
+ goto out;
}
res = register_netdevice(bond_dev);
- if (res < 0)
- goto out_netdev;
out:
rtnl_unlock();
+ if (res < 0)
+ bond_destructor(bond_dev);
return res;
-out_netdev:
- free_netdev(bond_dev);
- goto out;
}
static int __net_init bond_net_init(struct net *net)
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