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rtnetlink: wait for unregistering devices in rtnl_link_unregister()

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From: Cong Wang <cwang@twopensource.com>

commit 50624c934d (net: Delay default_device_exit_batch until no
devices are unregistering) introduced rtnl_lock_unregistering() for
default_device_exit_batch(). Same race could happen we when rmmod a driver
which calls rtnl_link_unregister() as we call dev->destructor without rtnl
lock.

For long term, I think we should clean up the mess of netdev_run_todo()
and net namespce exit code.

Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang
2014-05-12 15:11:20 -07:00
committed by David S. Miller
parent e84d2f8d2a
commit 200b916f35
4 changed files with 39 additions and 3 deletions
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2
net/core/dev.c
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@@ -5541,7 +5541,7 @@ static int dev_new_index(struct net *net)
/* Delayed registration/unregisteration */
static LIST_HEAD(net_todo_list);
static DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
static void net_set_todo(struct net_device *dev)
{