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net: Queue net_cleanup_work only if there is first net added 

When llist_add() returns false, cleanup_net() hasn't made its
llist_del_all(), while the work has already been scheduled
by the first queuer. So, we may skip queue_work() in this case.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kirill Tkhai 2018-02-19 12:58:54 +03:00 committed by David S. Miller
parent 65b7b5b90f
commit 8349efd903
1 changed files with 2 additions and 2 deletions
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4
net/core/net_namespace.c
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@ -582,8 +582,8 @@ static DECLARE_WORK(net_cleanup_work, cleanup_net);
void __put_net(struct net *net)
{
/* Cleanup the network namespace in process context */
llist_add(&net->cleanup_list, &cleanup_list);
queue_work(netns_wq, &net_cleanup_work);
if (llist_add(&net->cleanup_list, &cleanup_list))
queue_work(netns_wq, &net_cleanup_work);
}
EXPORT_SYMBOL_GPL(__put_net);