[Intel-gfx] [PATCH] drm/i915: Only unwind the local pgtable layer if empty

[Chris Wilson]

On Sat, Feb 25, 2017 at 09:19:59PM +0000, Chris Wilson wrote:
> Only if we allocated the layer and the lower level failed should we
> remove this layer when unwinding. Otherwise we ignore the overlapping
> entries by overwritting the old layer with scratch.
> 
> Fixes: c5d092a4293f ("drm/i915: Remove bitmap tracking for used-pml4")
> Fixes: e2b763caa6eb ("drm/i915: Remove bitmap tracking for used-pdpes")
> Reported-by: Matthew Auld <matthew.william.auld at gmail.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99948

Seems like it got further, but still hits the same bug_on.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre