Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6:
  Driver Core: do not oops when driver_unregister() is called for unregistered drivers
  sysfs: file.c: use create_singlethread_workqueue()