drm/i915: Don't unconditionally try to deref aliasing ppgtt
authorBen Widawsky <benjamin.widawsky@intel.com>
Fri, 6 Dec 2013 22:10:48 +0000 (14:10 -0800)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Wed, 18 Dec 2013 14:27:44 +0000 (15:27 +0100)
commit6f425321e02a1b6c5e90b70f8fab7c140fcaeefb
treec29f76a5eb0c715e8a50f14434ef298168ad784e
parente178f7057b81c87a7ceaae0ca204487b6f7eedcf
drm/i915: Don't unconditionally try to deref aliasing ppgtt

Since the beginning, the functions which try to properly reference the
aliasing PPGTT have deferences a potentially null aliasing_ppgtt member.
Since the accessors are meant to be global, this will not do.

Introduced originally in:
commit a70a3148b0c61cb7c588ea650db785b261b378a3
Author: Ben Widawsky <ben@bwidawsk.net>
Date:   Wed Jul 31 16:59:56 2013 -0700

    drm/i915: Make proper functions for VMs

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/i915_gem.c