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netns: Add an explicit rcu_barrier to unregister_pernet_{device|subsys}

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This allows namespace exit methods to batch work that comes requires an
rcu barrier using call_rcu without having to treat the
unregister_pernet_operations cases specially.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2009-12-03 02:29:06 +00:00 committed by David S. Miller
parent d79d792ef9
commit 3a765edadb
1 changed files with 6 additions and 2 deletions
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8
net/core/net_namespace.c
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@ -413,8 +413,11 @@ static int register_pernet_operations(struct list_head *list,
}
}
error = __register_pernet_operations(list, ops);
if (error && ops->id)
ida_remove(&net_generic_ids, *ops->id);
if (error) {
rcu_barrier();
if (ops->id)
ida_remove(&net_generic_ids, *ops->id);
}
return error;
}
@ -423,6 +426,7 @@ static void unregister_pernet_operations(struct pernet_operations *ops)
{
__unregister_pernet_operations(ops);
rcu_barrier();
if (ops->id)
ida_remove(&net_generic_ids, *ops->id);
}