netdev - [PATCH next-net] ipv6: Use hlist_for_each_entry_rcu_bh() in ipv6_chk_same

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Date:	Tue,  1 Nov 2011 13:30:55 +0800
From:	roy.qing.li@...il.com
To:	netdev@...r.kernel.org
Subject: [PATCH next-net] ipv6: Use hlist_for_each_entry_rcu_bh() in ipv6_chk_same_addr()

From: RongQing.Li <roy.qing.li@...il.com>

Replace hlist_for_each_entry and hlist_for_each_entry_rcu with
hlist_for_each_entry_rcu_bh() in ipv6_chk_same_addr and
ipv6_chk_addr to keep that all dereference methods for addr_list
are same, and take advantage of _rcu_bh() critical section
checking and prevention from compiler merging or refetching.

Signed-off-by: RongQing.Li <roy.qing.li@...il.com>
---
 net/ipv6/addrconf.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e39239e..5ad7d5f 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1279,7 +1279,7 @@ int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
 	unsigned int hash = ipv6_addr_hash(addr);
 
 	rcu_read_lock_bh();
-	hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
+	hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
 		if (!net_eq(dev_net(ifp->idev->dev), net))
 			continue;
 		if (ipv6_addr_equal(&ifp->addr, addr) &&
@@ -1303,7 +1303,7 @@ static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 	struct inet6_ifaddr *ifp;
 	struct hlist_node *node;
 
-	hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
+	hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
 		if (!net_eq(dev_net(ifp->idev->dev), net))
 			continue;
 		if (ipv6_addr_equal(&ifp->addr, addr)) {
-- 
1.7.1

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