[Bug 96806] [BAT BDW SKL] gem_exec_flush "*ERROR* Hangcheck timer elapsed..."

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96806

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

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

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 04171313cb25311acf82279284d722fed7b70d53
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jul 6 12:39:00 2016 +0100

    drm/i915: Always double check for a missed interrupt for new bottom halves

    After assigning ourselves as the new bottom-half, we must perform a
    cursory check to prevent a missed interrupt.  Either we miss the interrupt
    whilst programming the hardware, or if there was a previous waiter (for
    a later seqno) they may be woken instead of us (due to the inherent race
    in the unlocked read of b->tasklet in the irq handler) and so we miss the
    wake up.

    Spotted-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96806
    Fixes: 688e6c725816 ("drm/i915: Slaughter the thundering... herd")
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Link:
http://patchwork.freedesktop.org/patch/msgid/1467805142-22219-1-git-send-email-chris@chris-wilson.co.uk

-- 
You are receiving this mail because:
You are on the CC list for the bug.
You are the assignee for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20160706/f2591e5a/attachment.html>