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    SubjectRe: [PATCH] floppy: convert to delayed work and single-thread wq
    On Wed, May 16, 2012 at 10:24:37PM +0200, Jiri Kosina wrote:
    > In floppy_grab_irq_and_dma() the point is to drain the workqueue
    > completely (before the conversion, we were just using
    > flush_work_sync(&floppy_work) for particular work item), and for that
    > flush_work() is not sufficient any more.
    > So I am really considering going back to driver-specific singlethreaded
    > workqueue.

    Ummm... still confused. flush_work_sync() is fine too. If you have
    two, two calls to flush_work_sync() are equivalent to flushing the
    workqueue in effect. You just need to avoid flush_workqueue() because
    system workqueues may be hosting work items which can run arbitrarily



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