linux-kernel - [PATCH v2 net-next] fib_trie: remove duplicated rcu lock

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Message-Id: <1381665009-4436-1-git-send-email-baker.kernel@gmail.com>
Date:	Sun, 13 Oct 2013 19:50:09 +0800
From:	baker.kernel@...il.com
To:	davem@...emloft.net, eric.dumazet@...il.com
Cc:	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"baker.zhang" <baker.kernel@...il.com>
Subject: [PATCH v2 net-next] fib_trie: remove duplicated rcu lock

From: "baker.zhang" <baker.kernel@...il.com>

fib_table_lookup has included the rcu lock protection.

Signed-off-by: baker.zhang <baker.kernel@...il.com>
---
Thanks for Eric Dumazet's review.
The V1 patch remove a necessary rcu read lock.

 net/ipv4/fib_frontend.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index b3f627a..d846304 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -933,7 +933,6 @@ static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb)
 		local_bh_disable();
 
 		frn->tb_id = tb->tb_id;
-		rcu_read_lock();
 		frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
 
 		if (!frn->err) {
@@ -942,7 +941,6 @@ static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb)
 			frn->type = res.type;
 			frn->scope = res.scope;
 		}
-		rcu_read_unlock();
 		local_bh_enable();
 	}
 }
-- 
1.8.1.2

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