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    SubjectRe: [git patches] libata updates for 2.6.34
    On 03/15/2010 03:33 AM, Zeno Davatz wrote:
    > On Mon, Mar 15, 2010 at 3:55 AM, Jeff Garzik<> wrote:
    >> On 03/09/2010 11:26 PM, Tejun Heo wrote:
    >>> Hello, Linus, Jeff.
    >>> On 03/10/2010 07:12 AM, Jeff Garzik wrote:
    >>>> Coincedentally, it looks like someone else just reported the same
    >>>> problem, with 2.6.34-rc1.
    >>>> It definitely sounds like a race. READ DMA is a DMA command as the name
    >>>> implies, so that eliminates the possibility of polling-related paths in
    >>>> ata_sff_interrupt (libata-sff.c).
    >>>> I'll flip some of my machines to the icky slow boring piix mode, rather
    >>>> than sexy AHCI mode :) to see if I can reproduce. I have had a feeling
    >>>> that we needed a more sophisticated IRQ handling setup, this may be what
    >>>> was needed. Lost interrupt recovery should occur faster than 30 seconds
    >>>> in any case, and should not require a hard reset if the hardware
    >>>> functions just fine outside of the lost-interrupt / race that just
    >>>> occurred.
    >>> Yeap, there is a race condition with clearing which I don't think we
    >>> can solve completely but with some modification I think we can at
    >>> least cover known failure cases.
    >>> For longer term, I don't think we can solve this by diddling with the
    >>> SFF registers. The interface is just way too ancient and horrid to
    >>> build anything reliable on top of. I'm planning on implementing
    >>> smarter IRQ storm handling and stepped timeouts for ATA commands.
    >> A tester on this bug
    >> seemed to find success with the patch.
    > Thanks for the Update!
    > I will wait some more and then test rc-2.

    Can you test the patch, please?


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