[PATCH] Lock scsi_low, ct(4), ncv(4), nsp(4), stg(4)

This patch adds locking to the scsi_low subsystem and the drivers that use it: 
ct(4), ncv(4), nsp(4), and stg(4).  The drivers are all marked MPSAFE.  The 
patch is against HEAD but probably applies to 9 and 10 as well.

http://people.freebsd.org/~jhb/patches/scsi_low_locking.patch

-- 
John Baldwin