John Baldwin 9ea9af5281 Add locking for sscdisk(4) and mark it MPSAFE. Since this driver just
makes calls out to the emulator, the locking is fairly simple.  A global
mutex protects the list of ssc disks, and each ssc disk has a mutex
to protect it's bioq.

Approved by:	marcel
2012-08-16 17:17:08 +00:00
..