netdev - [PATCH v3 2/2] net: Remove spinlock from get_net_ns_by

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Date:   Tue, 16 Jan 2018 12:31:54 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, eric.dumazet@...il.com, ebiederm@...ssion.com,
        ktkhai@...tuozzo.com
Subject: [PATCH v3 2/2] net: Remove spinlock from get_net_ns_by_id()

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

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 net/core/net_namespace.c |    2 --
 1 file changed, 2 deletions(-)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 3c77d84ad60d..1ccb953b3b09 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -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;