linux-kernel - Re: [Patch]net/xfrm/xfrm_policy.c: replace timer with delayed

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Date:	Fri, 2 May 2008 13:21:24 +0800 (CST)
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
cc:	WANG Cong <xiyou.wangcong@...il.com>, linux-kernel@...r.kernel.org,
	davem@...emloft.net, akpm@...l.org, netdev@...r.kernel.org
Subject: Re: [Patch]net/xfrm/xfrm_policy.c: replace timer with delayed_work

On Thu, 1 May 2008, Herbert Xu wrote:

> On Thu, May 01, 2008 at 12:06:55AM +0800, WANG Cong wrote:
>> 
>> Hi, Herbert.
>> 
>> I referenced the book Linux Device Drivers, it is said that
>> the work function in workqueue can sleep, that is to say, it only
>> works in process context, so we don't need the disable the lock
>> in softirq, which is interrupt context, right?
>
> Because it can sleep, you must disable BH for locks that can
> be taken on the softirq path as otherwise a softirq can come
> in, try to take the lock again and dead-lock.

Yes, I was an idiot.

I will resend the revised patches right now.
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