netdev - Re: [PATCH net v2] rtnetlink: wait for unregistering devices in rtnl_link

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Message-Id: <20140515.145043.2164782223537934866.davem@davemloft.net>
Date:	Thu, 15 May 2014 14:50:43 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	xiyou.wangcong@...il.com
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	cwang@...pensource.com, ebiederm@...ssion.com
Subject: Re: [PATCH net v2] rtnetlink: wait for unregistering devices in
 rtnl_link_unregister()

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Thu, 15 May 2014 11:43:26 -0700

> On Thu, May 15, 2014 at 11:32 AM, David Miller <davem@...emloft.net> wrote:
>> From: Cong Wang <xiyou.wangcong@...il.com>
>> Date: Mon, 12 May 2014 15:11:20 -0700
>>
>>> +static void rtnl_lock_unregistering_all(void)
>>
>> This is just:
>>
>>         rtnl_lock_unregistering(&net_namespace_list);
>>
>> There is no need to reimplement the entire thing.
> 
> This is exactly what I did in v0 (never sent out) locally,
> I spent few hours to debug the problem. The problem
> is net_namespace_list links netns by net->list,
> while rtnl_lock_unregistering() uses net->exit_list.
> Thus I used an ugly macro in v1.
> 
> There seems no other choice than  between
> an ugly macro and duplicated code.

Thanks for explaining (again), I'll look at this some more.
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