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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
fs/sysfs/dir.c
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@@ -378,12 +378,10 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent)
struct sysfs_dirent *new_parent_sd, *sd;
int error;
if (!new_parent)
return -EINVAL;
old_parent_dentry = kobj->parent ?
kobj->parent->dentry : sysfs_mount->mnt_sb->s_root;
new_parent_dentry = new_parent->dentry;
new_parent_dentry = new_parent ?
new_parent->dentry : sysfs_mount->mnt_sb->s_root;
again:
mutex_lock(&old_parent_dentry->d_inode->i_mutex);