From 4ad72b7fadd285f849439cdbc408f8b847cef704 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 3 Sep 2014 19:23:37 +0100
Subject: [PATCH] drm/i915: Fix unsafe vma iteration in i915_drop_caches

When unbinding, there is a possibility that we drop the active reference
on the object, thereby freeing it. If that happens, we may destroy the
vm link as well as the object and vma. So iterate carefully.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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