From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Fri, 5 Mar 2010 21:07:39 +0000 (+0000)
Subject: bridge: Use RCU list primitive in __br_mdb_ip_get
X-Git-Tag: v2.6.34-rc2~48^2~39
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=49f5fcfd4ac3df24aa66520e1c5f37db5dfa8c10;p=platform%2Fupstream%2Fkernel-adaptation-pc.git

bridge: Use RCU list primitive in __br_mdb_ip_get

As Paul McKenney correctly pointed out, __br_mdb_ip_get needs
to use the RCU list walking primitive in order to work correctly
on platforms where data-dependency ordering is not guaranteed.

Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 8b25887..a1ffe15 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -38,7 +38,7 @@ static struct net_bridge_mdb_entry *__br_mdb_ip_get(
 	struct net_bridge_mdb_entry *mp;
 	struct hlist_node *p;
 
-	hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
+	hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
 		if (dst == mp->addr)
 			return mp;
 	}