Commit 3a765eda authored by Eric W. Biederman's avatar Eric W. Biederman Committed by David S. Miller
Browse files

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: default avatarEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d79d792e

net/core/net_namespace.c

+6 −2
Original line number Diff line number Diff line
@@ -413,8 +413,11 @@ static int register_pernet_operations(struct list_head *list, 
		}

	}

	error = __register_pernet_operations(list, ops);

	if (error && 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);

}