drm/i915: Kill drop_pages()
The drop_pages() function is a dangerous trap in that it can release the
passed in object pointer and so unless the caller is aware, it can
easily trick us into using the stale object afterwards. Move it into its
solitary callsite where we know it is safe.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470293567-10811-9-git-send-email-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a38af9e..8892baa 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -306,20 +306,6 @@
return ret;
}
-static int
-drop_pages(struct drm_i915_gem_object *obj)
-{
- int ret;
-
- i915_gem_object_get(obj);
- ret = i915_gem_object_unbind(obj);
- if (ret == 0)
- ret = i915_gem_object_put_pages(obj);
- i915_gem_object_put(obj);
-
- return ret;
-}
-
int
i915_gem_object_attach_phys(struct drm_i915_gem_object *obj,
int align)
@@ -340,7 +326,11 @@
if (obj->base.filp == NULL)
return -EINVAL;
- ret = drop_pages(obj);
+ ret = i915_gem_object_unbind(obj);
+ if (ret)
+ return ret;
+
+ ret = i915_gem_object_put_pages(obj);
if (ret)
return ret;