From: Markus Lidel <Markus.Lidel@shadowconnect.com>

* more than 3 "visible" disks (hda, hdb, hdc, hdd) lead to kernel panics.

* removes some unused code with partitions.

* I2O_LOCK was often called with the addresses of the controller, and not
  with the address of the device.  Fixed.

* the cleanup function for gendisk (del_gendisk) doesn't work if the queue
  is shared between different devices.  To workaround the queue is removed
  before.

* redundant code removed in module initialization and remove, use
  i2ob_new_device and i2ob_del_device instead.

* removed atomic_t queue_depth

* removed unnecessary and bogus code for queue handling