[Intel-gfx] [PATCH v3] drm/i915: Store a permanent error in obj->mm.pages

[Joonas Lahtinen]

On ti, 2017-03-07 at 13:20 +0000, Chris Wilson wrote:
> Once the object has been truncated, it is unrecoverable. To facilitate
> detection of this state store the error in obj->mm.pages.
> 
> This is required for the next patch which should be applied to v4.10
> (via stable), so we also need to mark this patch for backporting. In
> that regard, let's consider this to be a fix/improvement too.
> 
> v2: Avoid dereferencing the ERR_PTR when freeing the object.
> 
> Fixes: 1233e2db199d ("drm/i915: Move object backing storage manipulation to its own locking")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: <stable at vger.kernel.org> # v4.10+

I'd imagine we may want a couple more GEM_BUG_ON checks going forward.
Regardless;

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation