[Bug 84207] [SNB+ Regression]igt/gem_render_copy_redux sporadically cause system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84207

--- Comment #21 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit e9681366ea9e76ab8f75e84351f2f3ca63ee542c
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Sep 26 10:31:02 2014 +0100

    drm/i915: Do not store the error pointer for a failed userptr registration

    Fixes regression from commit ad46cb533d586fdb256855437af876617c6cf609
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Thu Aug 7 14:20:40 2014 +0100

        drm/i915: Prevent recursive deadlock on releasing a busy userptr

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84207
    Testcase: igt/gem_render_copy_redux
    Testcase: igt/gem_userptr_blits/create-destroy-sync
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Jacek Danecki <jacek.danecki at intel.com>
    Cc: "Gong, Zhipeng" <zhipeng.gong at intel.com>
    Cc: Jacek Danecki <jacek.danecki at intel.com>
    Cc: "Ursulin, Tvrtko" <tvrtko.ursulin at intel.com>
    Cc: stable at vger.kernel.org
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>

Note that the commit references both this bugzilla and the new test case from
c12 that qa reported failure for in c17.

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