linux-kernel - Re: [PATCH] ipv6: addrconf: Avoid addrconf_disable

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Message-Id: <20170119.110946.2012674581809955045.davem@davemloft.net>
Date:   Thu, 19 Jan 2017 11:09:46 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     wangkefeng.wang@...wei.com
Cc:     kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
        kaber@...sh.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, dingtianhong@...wei.com,
        weiyongjun1@...wei.com, guohanjun@...wei.com
Subject: Re: [PATCH] ipv6: addrconf: Avoid addrconf_disable_change() using
 RCU read-side lock

From: Kefeng Wang <wangkefeng.wang@...wei.com>
Date: Thu, 19 Jan 2017 16:26:21 +0800

> 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@...wei.com>

Applied and queued up for -stable, thanks.