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    SubjectRe: [PATCH block/for-next] block: don't call blk_drain_queue() if elevator is not up
    From
    Hello,

    On Fri, Nov 4, 2011 at 2:40 AM, Stefan Richter
    <stefanr@s5r6.in-berlin.de> wrote:
    >>       /* @q won't process any more request, flush async actions */
    >>       del_timer_sync(&q->backing_dev_info.laptop_mode_wb_timer);
    >
    > What prevents elevator_attach to be called and requests to be inserted
    > between 'if (q-elevator)' and 'blk_put_queue(q)'?

    The fact that the queue owner has called blk_cleaup_queue()?

    Thanks.

    --
    tejun
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