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driver core: Allow device_move(dev, NULL).

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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>
This commit is contained in:
Cornelia Huck 2007-01-08 20:16:44 +01:00 • committed by Greg Kroah-Hartman
parent 717e48c29d
commit c744aeae9d
3 changed files with 52 additions and 36 deletions
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6
lib/kobject.c
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@ -314,7 +314,7 @@ int kobject_rename(struct kobject * kobj, const char *new_name)
/**
* 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 @@ int kobject_move(struct kobject *kobj, struct kobject *new_parent)
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);