netdev - [PATCH v2 3/3] net: Remove spinlock from get_net_ns_by

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Message-ID: <151551004908.4318.11080493179034599392.stgit@localhost.localdomain>
Date:   Tue, 09 Jan 2018 18:00:57 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     eric.dumazet@...il.com, ktkhai@...tuozzo.com, ebiederm@...ssion.com
Subject: [PATCH v2 3/3] 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 497135f314ce..5f9e18b31a1a 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;