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    SubjectRe: [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.

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