[Bug 77717] [PNV/ILK Regression]igt/drv_suspend/debugfs-reader fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77717

--- Comment #4 from Guo Jinxian <jinxianx.guo at intel.com> ---
(In reply to comment #3)
> 691e6415c891b8b2b082a120b896b443531c4d45 is the first bad commit
> commit 691e6415c891b8b2b082a120b896b443531c4d45
> Author:     Chris Wilson <chris at chris-wilson.co.uk>
> AuthorDate: Wed Apr 9 09:07:36 2014 +0100
> Commit:     Jani Nikula <jani.nikula at intel.com>
> CommitDate: Fri Apr 11 13:29:51 2014 +0300
> 
>     drm/i915: Always use kref tracking for all contexts.
> 
>     If we always initialize kref for the context, even if we are using fake
>     contexts for hangstats when there is no hw support, we can forgo the
>     dance to dereference the ctx->obj and inspect whether we are permitted
>     to use kref inside i915_gem_context_reference() and _unreference().
> 
>     My ulterior motive here is to improve the debugging of a use-after-free
>     of ctx->obj. This patch avoids the dereference here and instead forces
>     the assertion checks associated with kref.
> 
>     v2: Refactor the fake contexts to being even more like the real
>     contexts, so that there is much less duplicated and special case code.
> 
>     v3: Tweaks.
>     v4: Tweaks, minor.
> 
>     Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76671
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Tested-by: lu hua <huax.lu at intel.com>
>     Cc: Ben Widawsky <benjamin.widawsky at intel.com>
>     Cc: Mika Kuoppala <mika.kuoppala at intel.com>
>     Reviewed-by: Ben Widawsky <ben at bwidawsk.net>
>     [Jani: tiny change to backport to drm-intel-fixes.]
>     Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> 
> :040000 040000 b9a776bb2de3ba84f614087619e9e91a2bdcc960
> e5dd0a22c4ec8df198400605e960f8c683e732ed M      drivers

Revert the commit on latest -fixes, The case will successed.

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