! ATAPI commands need to be of size 12. However, general SCSI packets
  may have any length and thus the SCSI command to be sent has to be
  copied to a temporary buffer before it can be passed to the ATAPI
  device.
Signed-off-by: Max Reitz <max@tyndur.org>
Acked-by: Kevin Wolf <kevin@tyndur.org>