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    SubjectRe: [BUG] ide dma_timer_expiry, then hard lockup
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    On Mon, Jun 18, 2007 at 09:27:04PM +0100, Alan Cox wrote:
    > > ide_dma_timeout_retry() in ide-io.c
    > > prints the "hdc: DMA Timeout error" then calls
    > > HWIF(drive)->ide_dma_end(drive);
    > > which returns, and then calls
    > > hwif->INB(IDE_STATUS_REG) which is needed as an argument to ide_error()
    > >
    > > But this hangs! -- The INB never returns.
    > > Now: hwif->INB = ide_inb; in ide-iops.c
    >
    > Yep and the I/O cycle never completes so the box hangs. This occurs if
    > the drive blows up and never switches IORDY to indicate completion. The
    > hpt will also do this sometimes if it gets addled by a confused drive,
    > while an intel one often won't.

    So what do you suggest? (I could buy an alternate ide controller,
    and hope that goes away, or just buy a different hard drive. But
    that's beside the point).

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

    --linas
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