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[PATCH 3.10 134/268] ipv6: addrconf: Avoid addrconf_disable_change() using RCU read-side lock

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  [PATCH 3.10 134/268] ipv6: addrconf: Avoid addrconf_disable_change() using RCU read-side lock Willy Tarreau <w@1wt.eu> - 2017-06-19 20:40 +0200

#1669588 — [PATCH 3.10 134/268] ipv6: addrconf: Avoid addrconf_disable_change() using RCU read-side lock

From: Kefeng Wang <wangkefeng.wang@huawei.com>

commit 03e4deff4987f79c34112c5ba4eb195d4f9382b0 upstream.

Just like commit 4acd4945cd1e ("ipv6: addrconf: Avoid calling
netdevice notifiers with RCU read-side lock"), it is unnecessary
to make addrconf_disable_change() use RCU iteration over the
netdev list, since it already holds the RTNL lock, or we may meet
Illegal context switch in RCU read-side critical section.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
 net/ipv6/addrconf.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a3e2c34..9c4aa2e 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4768,8 +4768,7 @@ static void addrconf_disable_change(struct net *net, __s32 newf)
 	struct net_device *dev;
 	struct inet6_dev *idev;
 
-	rcu_read_lock();
-	for_each_netdev_rcu(net, dev) {
+	for_each_netdev(net, dev) {
 		idev = __in6_dev_get(dev);
 		if (idev) {
 			int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
@@ -4778,7 +4777,6 @@ static void addrconf_disable_change(struct net *net, __s32 newf)
 				dev_disable_change(idev);
 		}
 	}
-	rcu_read_unlock();
 }
 
 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
-- 
2.8.0.rc2.1.gbe9624a

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