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    SubjectRe: [PATCH v2 0/2] Fix nouveau-related freezes
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    On Tue, 2010-11-16 at 17:19 -0500, Andrew Lutomirski wrote:
    > On Wed, Nov 10, 2010 at 6:04 PM, Andy Lutomirski <luto@mit.edu> wrote:
    > > Nouveau takes down my system quite reliably when any hotplug event occurs.
    > > The bug happens because the IRQ handler didn't acknowledge the hotplug
    > > state until the bottom half, so the card generated a new interrupt
    > > immediately, starving the bottom half and permanently starving that CPU
    > > (and hence the bottom half).
    > >
    > > Even with this fix, a lot of the IRQ code looks rather broken.
    > >
    > > This is tested on 2.6.36 (and makes the system stable for me), but it also
    > > applies cleanly to 2.6.37 (untested, but surely also necessary). Fedora 14's
    > > 2.6.35 kernels seem to have to same problem for me, so I suspect that 2.6.35
    > > needs this fix as well. (All of my tests are on an NV50 card.)
    > >
    > > Changes from v1:
    > > - Ignore unrequested hotplug bits (I accidentally removed that part).
    > > - Support newer hardware (untested -- Ben, can you check this?)
    >
    > Just a quick ping: is this making its way to Linus (and stable)? I've
    > been running it for five days through (literally, due to monitor bugs)
    > thousands of plug/unplug cycles with no ill effects.
    This issue has been fixed in nouveau git now, but that fix can't be
    pulled into stable/linus as it depends on architectural changes to
    nouveau that Linus probably wouldn't accept this late.

    I responded to a mail asking that the patches be redone to just fix the
    bug *without* removing the "magic numbers" (so, just patch 2/2
    essentially), to avoid more unnecessary conflicts with nouveau git.

    Ben.

    >
    > (Can we *please* get rid of, or at least ratelimit, the
    > plugged/unplugged printk? It's taking over my logs, and I'm almost
    > certain that it's not a driver bug.)
    >
    > --Andy




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