On Thu, Jun 25, 2015 at 06:39:30PM +0300, Mika Kuoppala wrote:
> Michel Thierry <michel.thie...@intel.com> writes:
>
> > If for some reason [1], the page directory/table does not exist, clear_range
> > would end up in an infinite while loop.
> >
> > Introduced by commit 06fda602dbca ("drm/i915: Create page table
> > allocators").
> >
> > [1] This is already being addressed in one of Mika's patches:
> > http://mid.gmane.org/1432314314-23530-17-git-send-email-mika.kuopp...@intel.com
> >
>
> We need both.
>
> > Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
> > Reported-by: John Harrison <john.c.harri...@intel.com>
> > Signed-off-by: Michel Thierry <michel.thie...@intel.com>
>
> Reviewed-by: Mika Kuoppala <mika.kuopp...@intel.com>
Since the offending commit is in 4.1 this is for Jani.
Cc: sta...@vger.kernel.org
Cheers, Daniel
>
> > ---
> > drivers/gpu/drm/i915/i915_gem_gtt.c | 6 +++---
> > 1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > index 2279e03..5dbe928 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > @@ -517,17 +517,17 @@ static void gen8_ppgtt_clear_range(struct
> > i915_address_space *vm,
> > struct page *page_table;
> >
> > if (WARN_ON(!ppgtt->pdp.page_directory[pdpe]))
> > - continue;
> > + break;
> >
> > pd = ppgtt->pdp.page_directory[pdpe];
> >
> > if (WARN_ON(!pd->page_table[pde]))
> > - continue;
> > + break;
> >
> > pt = pd->page_table[pde];
> >
> > if (WARN_ON(!pt->page))
> > - continue;
> > + break;
> >
> > page_table = pt->page;
> >
> > --
> > 2.4.4
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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