drm/i915: detach/attach get/put pages symmetry

After performing an operation over the page list for a buffer retrieved by
i915_gem_object_get_pages() the pages need to be returned with
i915_gem_object_put_pages(). This was not being observed for the phys
objects which were thus leaking references to their backing pages.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
CC: Dave Airlie <airlied@gmail.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c0ae6bbbd9b5..a5f95ad3c072 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4312,6 +4312,8 @@ void i915_gem_detach_phys_object(struct drm_device *dev,
         }
         drm_clflush_pages(obj_priv->pages, page_count);
         drm_agp_chipset_flush(dev);
+
+        i915_gem_object_put_pages(obj);
 out:
         obj_priv->phys_obj->cur_obj = NULL;
         obj_priv->phys_obj = NULL;
@@ -4369,6 +4371,8 @@ i915_gem_attach_phys_object(struct drm_device *dev,
                 kunmap_atomic(src, KM_USER0);
         }
 
+        i915_gem_object_put_pages(obj);
+
         return 0;
 out:
         return ret;