netdev - [PATCH net-next] ipv6: remove useless spin_lock/spin

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Message-ID: <547E6832.4070403@cn.fujitsu.com>
Date:	Wed, 3 Dec 2014 09:32:34 +0800
From:	Duan Jiong <duanj.fnst@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next] ipv6: remove useless spin_lock/spin_unlock


xchg is atomic, so there is no necessary to use spin_lock/spin_unlock
to protect it.

Signed-off-by: Duan Jiong <duanj.fnst@...fujitsu.com>
---
 net/ipv6/ipv6_sockglue.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index e1a9583..92ca907 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -112,9 +112,7 @@ struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 		}
 		opt = xchg(&inet6_sk(sk)->opt, opt);
 	} else {
-		spin_lock(&sk->sk_dst_lock);
 		opt = xchg(&inet6_sk(sk)->opt, opt);
-		spin_unlock(&sk->sk_dst_lock);
 	}
 	sk_dst_reset(sk);
 
-- 
1.8.3.1
--
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