[PATCH v2] drm/i915: Fix the kernel panic when using aliasing ppgtt

[Chris Wilson]

Quoting Chuanxiao Dong (2017-07-07 10:50:59)
> The ppgtt should be get directly from i915_address_space *vm instead of
> vma->vm.
> 
> v2:
> - add one more fix for bxt. (Chris)
> 
> Fixes: 4a234c5fae16 ("drm/i915: pass the vma to insert_entries")
> Bugzilla:https://bugs.freedesktop.org/show_bug.cgi?id=101713
> Signed-off-by: Chuanxiao Dong <chuanxiao.dong at intel.com>
> Reviewed-by: Matthew Auld <matthew.auld at intel.com> v1
> Cc: Matthew Auld <matthew.auld at intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Zhenyu Wang <zhenyuw at linux.intel.com>

Thanks for finding and quickly providing the fix, pushed.
-Chris