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net: Remove spinlock from get_net_ns_by_id()

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idr_find() is safe under rcu_read_lock() and
maybe_get_net() guarantees that net is alive.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kirill Tkhai 2018-01-16 12:31:54 +03:00 committed by David S. Miller
parent 0c06bea919
commit 42157277af
1 changed files with 0 additions and 2 deletions
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2
net/core/net_namespace.c
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@ -273,11 +273,9 @@ struct net *get_net_ns_by_id(struct net *net, int id)
return NULL;
rcu_read_lock();
spin_lock_bh(&net->nsid_lock);
peer = idr_find(&net->netns_ids, id);
if (peer)
peer = maybe_get_net(peer);
spin_unlock_bh(&net->nsid_lock);
rcu_read_unlock();
return peer;