Re: "Fix ATAPI transfer lengths" causes CD writing regression

[Alan Cox]

> Maybe we could set a limit here. If the ATAPI device keeps DRQ=1 and
> exceeds the limit, we consider it as HSM violation and have EH handle it.

On a DMA transfer its basically out of our control (and a PIO drain will
lock some controllers solid until power cycle), but on PIO we know we
never set a chunk size over 64K, so if we exceed 64K its time to apply a
larger hammer
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