From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:57262 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751617AbdBAILs (ORCPT ); Wed, 1 Feb 2017 03:11:48 -0500 Subject: Patch "ipv6: addrconf: Avoid addrconf_disable_change() using RCU read-side lock" has been added to the 4.9-stable tree To: wangkefeng.wang@huawei.com, davem@davemloft.net, gregkh@linuxfoundation.org Cc: , From: Date: Wed, 01 Feb 2017 09:11:18 +0100 Message-ID: <14859366786129@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 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 4.9-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-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Wed Feb 1 08:50:24 CET 2017 From: Kefeng Wang Date: Thu, 19 Jan 2017 16:26:21 +0800 Subject: ipv6: addrconf: Avoid addrconf_disable_change() using RCU read-side lock From: Kefeng Wang [ 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 Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/addrconf.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -5515,8 +5515,7 @@ 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); @@ -5525,7 +5524,6 @@ 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@huawei.com are queue-4.9/ipv6-addrconf-avoid-addrconf_disable_change-using-rcu-read-side-lock.patch