o Clean up driver locking by making the locking semantics between
   2.4.X and 2.5.X almost identical.  Take advantage of SCSI_HAS_HOST_LOCK
   in certain RedHat kernels.
 o Clean up command line parsing.
 o Fix module unload/reload issues stemming from DV thread teardown
   and a missing deregistration of our reboot notifier (lost during
   PCI hot plug integration).