[Bug 80709] [snb] semaphores deadlock -- testing improved deadlock breaker

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80709

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit a0d036b074b4a5a933e37fcb9bdd6b3cc80a0387
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat Jul 19 12:40:42 2014 +0100

    drm/i915: Reorder the semaphore deadlock check, again

    commit 4be173813e57c7298103a83155c2391b5b167b4c
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Fri Jun 6 10:22:29 2014 +0100

        drm/i915: Reorder semaphore deadlock check

    did the majority of the work, but it missed one crucial detail:

    The check for the unkickable deadlock on this ring must come after the
    check whether the ring that we are waiting on has already passed its
    target seqno.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80709
    Tested-by: Stefan Huber <shuber at sthu.org>
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Mika Kuoppala <mika.kuoppala at intel.com>
    Cc: Jani Nikula <jani.nikula at intel.com>
    Cc: stable at vger.kernel.org
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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