From 1d7138de878d1d4210727c1200193e69596f93b3 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 12 Nov 2010 05:46:50 +0000
Subject: igmp: RCU conversion of in_dev->mc_list
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

in_dev->mc_list is protected by one rwlock (in_dev->mc_list_lock).

This can easily be converted to a RCU protection.

Writers hold RTNL, so mc_list_lock is removed, not replaced by a
spinlock.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Cypher Wu <cypher.w@gmail.com>
Cc: Américo Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/net/inet_sock.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'include/net')

diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 1989cfd7405..8945f9fb192 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -141,7 +141,7 @@ struct inet_sock {
 				nodefrag:1;
 	int			mc_index;
 	__be32			mc_addr;
-	struct ip_mc_socklist	*mc_list;
+	struct ip_mc_socklist __rcu	*mc_list;
 	struct {
 		unsigned int		flags;
 		unsigned int		fragsize;
-- 
cgit v1.2.3-70-g09d2