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netns: Add an explicit rcu_barrier to unregister_pernet_{device|subsys}
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>
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@ -413,8 +413,11 @@ again:
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}
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}
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error = __register_pernet_operations(list, ops);
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if (error && ops->id)
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ida_remove(&net_generic_ids, *ops->id);
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if (error) {
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rcu_barrier();
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if (ops->id)
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ida_remove(&net_generic_ids, *ops->id);
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}
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return error;
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}
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@ -423,6 +426,7 @@ static void unregister_pernet_operations(struct pernet_operations *ops)
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{
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__unregister_pernet_operations(ops);
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rcu_barrier();
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if (ops->id)
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ida_remove(&net_generic_ids, *ops->id);
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}
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