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    SubjectRe: [BUG] ide dma_timer_expiry, then hard lockup
    Mark Lord wrote:

    >>>>>> I can prepare a patch, but only with a lot of guidance. I can test
    >>>>>> & debug, I'm highly motivated just right now ...

    >>>>> If you've got a nice repeatable problem please try using the libata
    >>>>> driver. That handles the error paths differently and doesn't try a
    >>>>> FIFO
    >>>>> drain which might matter in this case I guess.

    >>>> FIFO drain for DMA commands?

    >>> Welcome to the old IDE layer which I am so glad I left behind 8)

    >>> ide_ata_error will try and do a PIO flush regardless of the command type
    >>> if DRQ_STAT is asserted. See ide_dma_intr -> ide_error -> ...

    >> Indeed... but the thing is we don't know what's asserted in this
    >> case -- remember, it's reading the status register that locks
    >> everything up...

    > Exactly. And IORDY shouldn't really apply there,
    > unless some nitwit standards person wrote it into a spec..

    Wrote what? IORDY throttling does *apply* to both data and non-data
    register accesses, of course.

    > -ml

    MBR, Sergei
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