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Date: Thu, 1 May 2008 09:11:23 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: WANG Cong <xiyou.wangcong@...il.com>
Subject: Re: [Patch]net/xfrm/xfrm_policy.c: replace timer with delayed_work
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.
Cheers,
--
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