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    SubjectRe: 2.6.27-rc1 (2fca5c): libata: kernel cant boot
    On Sat, Oct 25 2008, Petr Vandrovec wrote:
    > Jens Axboe wrote:
    > >On Fri, Oct 24 2008, Elias Oltmanns wrote:
    > >>Jens Axboe <jens.axboe@oracle.com> wrote:
    > >>>From e598055dde1951c47c8b3522616f6ebff0ed9847 Mon Sep 17 00:00:00 2001
    > >>>From: Jens Axboe <jens.axboe@oracle.com>
    > >>>Date: Fri, 24 Oct 2008 09:22:42 +0200
    > >>>Subject: [PATCH] libata: fix bug with non-ncq devices
    > >>>
    > >>>The recent commit 201f1b98822078c808b5e2d379a6ddbfc0a06ee1 to enable
    > >>Wouldn't that be commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e?
    > >
    > >Yes that is correct, the other commit is actually a private one in my
    > >tree for other libata changes. Updated patch below, thanks for checking!
    > >
    > >From e598055dde1951c47c8b3522616f6ebff0ed9847 Mon Sep 17 00:00:00 2001
    > >From: Jens Axboe <jens.axboe@oracle.com>
    > >Date: Fri, 24 Oct 2008 09:22:42 +0200
    > >Subject: [PATCH] libata: fix bug with non-ncq devices
    >
    > Hello,
    > this fixes my DVD, but unfortunately NCQ devices connected to PMP are
    > still dead - apparently as soon as mount() tries to do serious I/O on
    > the drive. Backing out both post-2.6.28-rc1 fix as well as your
    > original change brings storage back. I suspect that problem is that
    > with PMP same tag cannot be (should not be? must not be?) used on
    > multiple devices behind PMP - and before your change tags were allocated
    > per-port, while now they are allocated per-device.

    That would indeed break, this requires allocating the tag map in the

    --
    Jens Axboe



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