drm: Introduce drm_mode_object_{get,put}()

For consistency with other reference counting APIs in the kernel, add
drm_mode_object_get() and drm_mode_object_put() to reference count DRM
mode objects.

Compatibility aliases are added to keep existing code working. To help
speed up the transition, all the instances of the old functions in the
DRM core are already replaced in this commit.

A semantic patch is provided that can be used to convert all drivers to
the new helpers.

Reviewed-by: Sean Paul <seanpaul@chromium.org>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170228144643.5668-3-thierry.reding@gmail.com

3 files changed, 23 insertions, 23 deletions

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 08d03d4594ee..39e470eb8aea 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -2238,13 +2238,13 @@ retry:
 		}
 
 		if (!obj->properties) {
-			drm_mode_object_unreference(obj);
+			drm_mode_object_put(obj);
 			ret = -ENOENT;
 			goto out;
 		}
 
 		if (get_user(count_props, count_props_ptr + copied_objs)) {
-			drm_mode_object_unreference(obj);
+			drm_mode_object_put(obj);
 			ret = -EFAULT;
 			goto out;
 		}
@@ -2257,14 +2257,14 @@ retry:
 			struct drm_property *prop;
 
 			if (get_user(prop_id, props_ptr + copied_props)) {
-				drm_mode_object_unreference(obj);
+				drm_mode_object_put(obj);
 				ret = -EFAULT;
 				goto out;
 			}
 
 			prop = drm_mode_obj_find_prop_id(obj, prop_id);
 			if (!prop) {
-				drm_mode_object_unreference(obj);
+				drm_mode_object_put(obj);
 				ret = -ENOENT;
 				goto out;
 			}
@@ -2272,14 +2272,14 @@ retry:
 			if (copy_from_user(&prop_value,
 					   prop_values_ptr + copied_props,
 					   sizeof(prop_value))) {
-				drm_mode_object_unreference(obj);
+				drm_mode_object_put(obj);
 				ret = -EFAULT;
 				goto out;
 			}
 
 			ret = atomic_set_prop(state, obj, prop, prop_value);
 			if (ret) {
-				drm_mode_object_unreference(obj);
+				drm_mode_object_put(obj);
 				goto out;
 			}
 
@@ -2292,7 +2292,7 @@ retry:
 			plane_mask |= (1 << drm_plane_index(plane));
 			plane->old_fb = plane->fb;
 		}
-		drm_mode_object_unreference(obj);
+		drm_mode_object_put(obj);
 	}
 
 	ret = prepare_crtc_signaling(dev, state, arg, file_priv, &fence_state,
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
index 2ab8ccf2ca98..2eb0792dfaf3 100644
--- a/drivers/gpu/drm/drm_mode_object.c
+++ b/drivers/gpu/drm/drm_mode_object.c
@@ -133,7 +133,7 @@ struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
  *
  * This function is used to look up a modeset object. It will acquire a
  * reference for reference counted objects. This reference must be dropped again
- * by callind drm_mode_object_unreference().
+ * by callind drm_mode_object_put().
  */
 struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
 		uint32_t id, uint32_t type)
@@ -146,38 +146,38 @@ struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
 EXPORT_SYMBOL(drm_mode_object_find);
 
 /**
- * drm_mode_object_unreference - decr the object refcnt
- * @obj: mode_object
+ * drm_mode_object_put - release a mode object reference
+ * @obj: DRM mode object
  *
  * This function decrements the object's refcount if it is a refcounted modeset
  * object. It is a no-op on any other object. This is used to drop references
- * acquired with drm_mode_object_reference().
+ * acquired with drm_mode_object_get().
  */
-void drm_mode_object_unreference(struct drm_mode_object *obj)
+void drm_mode_object_put(struct drm_mode_object *obj)
 {
 	if (obj->free_cb) {
 		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
 		kref_put(&obj->refcount, obj->free_cb);
 	}
 }
-EXPORT_SYMBOL(drm_mode_object_unreference);
+EXPORT_SYMBOL(drm_mode_object_put);
 
 /**
- * drm_mode_object_reference - incr the object refcnt
- * @obj: mode_object
+ * drm_mode_object_get - acquire a mode object reference
+ * @obj: DRM mode object
  *
  * This function increments the object's refcount if it is a refcounted modeset
  * object. It is a no-op on any other object. References should be dropped again
- * by calling drm_mode_object_unreference().
+ * by calling drm_mode_object_put().
  */
-void drm_mode_object_reference(struct drm_mode_object *obj)
+void drm_mode_object_get(struct drm_mode_object *obj)
 {
 	if (obj->free_cb) {
 		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
 		kref_get(&obj->refcount);
 	}
 }
-EXPORT_SYMBOL(drm_mode_object_reference);
+EXPORT_SYMBOL(drm_mode_object_get);
 
 /**
  * drm_object_attach_property - attach a property to a modeset object
@@ -363,7 +363,7 @@ int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
 			&arg->count_props);
 
 out_unref:
-	drm_mode_object_unreference(obj);
+	drm_mode_object_put(obj);
 out:
 	drm_modeset_unlock_all(dev);
 	return ret;
@@ -428,7 +428,7 @@ int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
 	drm_property_change_valid_put(property, ref);
 
 out_unref:
-	drm_mode_object_unreference(arg_obj);
+	drm_mode_object_put(arg_obj);
 out:
 	drm_modeset_unlock_all(dev);
 	return ret;
diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c
index 411e470369c0..15af0d42e8be 100644
--- a/drivers/gpu/drm/drm_property.c
+++ b/drivers/gpu/drm/drm_property.c
@@ -597,7 +597,7 @@ void drm_property_unreference_blob(struct drm_property_blob *blob)
 	if (!blob)
 		return;
 
-	drm_mode_object_unreference(&blob->base);
+	drm_mode_object_put(&blob->base);
 }
 EXPORT_SYMBOL(drm_property_unreference_blob);
 
@@ -625,7 +625,7 @@ void drm_property_destroy_user_blobs(struct drm_device *dev,
  */
 struct drm_property_blob *drm_property_reference_blob(struct drm_property_blob *blob)
 {
-	drm_mode_object_reference(&blob->base);
+	drm_mode_object_get(&blob->base);
 	return blob;
 }
 EXPORT_SYMBOL(drm_property_reference_blob);
@@ -906,7 +906,7 @@ void drm_property_change_valid_put(struct drm_property *property,
 		return;
 
 	if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
-		drm_mode_object_unreference(ref);
+		drm_mode_object_put(ref);
 	} else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
 		drm_property_unreference_blob(obj_to_blob(ref));
 }