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ipv6: addrconf: Avoid addrconf_disable_change() using RCU read-side lock

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[ Upstream commit 03e4deff4987f79c34112c5ba4eb195d4f9382b0 ]

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kefeng Wang 2017-01-19 16:26:21 +08:00 committed by Greg Kroah-Hartman
parent 8a066a8702
commit 8051bf2890
1 changed files with 1 additions and 3 deletions
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4
net/ipv6/addrconf.c
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@ -5244,8 +5244,7 @@ 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);
@ -5254,7 +5253,6 @@ 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)