[gem] Hold a reference on the object in i915_gem_wait_space.

Otherwise, in the middle of the function called using it the last ref
might disappear.

diff --git a/linux-core/i915_gem.c b/linux-core/i915_gem.c
index 8e5539f..e01823f 100644 (file)
--- a/linux-core/i915_gem.c
+++ b/linux-core/i915_gem.c
@@ -982,7 +982,9 @@ i915_gem_wait_space(struct drm_device *dev)
                                            list);
                if (obj_priv == last_priv)
                        break;
+               drm_gem_object_reference(obj_priv->obj);
                ret = i915_gem_object_wait_rendering(obj_priv->obj);
+               drm_gem_object_unreference(obj_priv->obj);
                if (ret)
                        break;
                last_priv = obj_priv;