libata-core.c: unsafe cancel_delayed_work() usage?

On 04/27, Andrew Morton wrote:

It'd be good if people could take some time to sit down and re-review the
code which we presently have. I plan on sending it all off for 2.6.22 and
there might be some glitches but it seems to have a good track record so
far.

Alan, the usage of cancel_delayed_work() in drivers/ata/libata-core.c looks
suspicious to me, both ->hotplug_task and ->port_task can re-arm themselves,
so cancel_delayed_work + flush_workqueue (or cancel_work_sync) is not enough.

Could you confirm/nack my understanding?

Oleg.

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