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

[Chris Wilson]

On Sat, Feb 25, 2017 at 09:41:56PM +0000, Chris Wilson wrote:
> 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.

Ah, starting to look like there are two (maybe more bugs) with identical
symptoms!
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre