[PATCH 2/2][Lucid SRU] drm/i915: Fix refleak during eviction.

[Seth Forshee]

From: Chris Wilson <chris at chris-wilson.co.uk>

BugLink: http://bugs.launchpad.net/bugs/843904

Now that we hold onto a reference whilst evicting objects, we need to
be sure that we drop all the references taken -- even on the error
paths.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
(backported from commit e39a01501b228e1be2037d5bddccae2a820af902 upstream)

Signed-off-by: Seth Forshee <seth.forshee at canonical.com>
---
 drivers/gpu/drm/i915/i915_gem_evict.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index c50c093..9e7f9c6 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -65,7 +65,7 @@ i915_gem_evict_something(struct drm_device *dev, int min_size, unsigned alignmen
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	struct list_head eviction_list, unwind_list;
-	struct drm_i915_gem_object *obj_priv, *tmp_obj_priv;
+	struct drm_i915_gem_object *obj_priv;
 	struct list_head *iter;
 	int ret = 0;
 
@@ -157,8 +157,10 @@ found:
 	 * scanning, therefore store to be evicted objects on a
 	 * temporary list. */
 	INIT_LIST_HEAD(&eviction_list);
-	list_for_each_entry_safe(obj_priv, tmp_obj_priv,
-				 &unwind_list, evict_list) {
+	while (!list_empty(&unwind_list)) {
+		obj_priv = list_first_entry(&unwind_list,
+					    struct drm_i915_gem_object,
+					    evict_list);
 		if (drm_mm_scan_remove_block(obj_priv->gtt_space)) {
 			list_move(&obj_priv->evict_list, &eviction_list);
 			continue;
@@ -179,7 +181,7 @@ found:
 		drm_gem_object_unreference(obj_priv->obj);
 	}
 
-	return 0;
+	return ret;
 }
 
 int
-- 
1.7.4.1