driver core: Allow device_move(dev, NULL).
If we allow NULL as the new parent in device_move(), we need to make sure
that the device is placed into the same place as it would if it was
newly registered:
- Consider the device virtual tree. In order to be able to reuse code,
setup_parent() has been tweaked a bit.
- kobject_move() can fall back to the kset's kobject.
- sysfs_move_dir() uses the sysfs root dir as fallback.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/lib/kobject.c b/lib/kobject.c
index 9aed594..c033dc8 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -314,7 +314,7 @@
/**
* kobject_move - move object to another parent
* @kobj: object in question.
- * @new_parent: object's new parent
+ * @new_parent: object's new parent (can be NULL)
*/
int kobject_move(struct kobject *kobj, struct kobject *new_parent)
@@ -330,8 +330,8 @@
return -EINVAL;
new_parent = kobject_get(new_parent);
if (!new_parent) {
- error = -EINVAL;
- goto out;
+ if (kobj->kset)
+ new_parent = kobject_get(&kobj->kset->kobj);
}
/* old object path */
devpath = kobject_get_path(kobj, GFP_KERNEL);