This is a note to let you know that I've just added the patch titled
ipv6: addrconf: Avoid addrconf_disable_change() using RCU read-side lock
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipv6-addrconf-avoid-addrconf_disable_change-using-rcu-read-side-lock.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Feb 1 08:49:51 CET 2017
From: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Date: Thu, 19 Jan 2017 16:26:21 +0800
Subject: ipv6: addrconf: Avoid addrconf_disable_change() using RCU read-side lock
From: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/addrconf.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5244,8 +5244,7 @@ static void addrconf_disable_change(stru
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(stru
dev_disable_change(idev);
}
}
- rcu_read_unlock();
}
static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
Patches currently in stable-queue which might be from wangkefeng.wang@xxxxxxxxxx are
queue-4.4/ipv6-addrconf-avoid-addrconf_disable_change-using-rcu-read-side-lock.patch
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