net: Expose all network devices in a namespaces in sysfs
authorEric W. Biederman <ebiederm@xmission.com>
Wed, 5 May 2010 00:36:49 +0000 (17:36 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 21 May 2010 16:37:34 +0000 (09:37 -0700)
commita1b3f594dc5faab91d3a218c7019e9b5edd9fe1a
tree42c81d7a89330afc65c11392e181e1a30f277f43
parent417daa1e8f893fbac88fd395340ba7779fd3926c
net: Expose all network devices in a namespaces in sysfs

This reverts commit aaf8cdc34ddba08122f02217d9d684e2f9f5d575.

Drivers like the ipw2100 call device_create_group when they
are initialized and device_remove_group when they are shutdown.
Moving them between namespaces deletes their sysfs groups early.

In particular the following call chain results.
netdev_unregister_kobject -> device_del -> kobject_del -> sysfs_remove_dir
With sysfs_remove_dir recursively deleting all of it's subdirectories,
and nothing adding them back.

Ouch!

Therefore we need to call something that ultimate calls sysfs_mv_dir
as that sysfs function can move sysfs directories between namespaces
without deleting their subdirectories or their contents.   Allowing
us to avoid placing extra boiler plate into every driver that does
something interesting with sysfs.

Currently the function that provides that capability is device_rename.
That is the code works without nasty side effects as originally written.

So remove the misguided fix for moving devices between namespaces.  The
bug in the kobject layer that inspired it has now been recognized and
fixed.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
net/core/dev.c
net/core/net-sysfs.c
net/core/net-sysfs.h