[PATCH] Lock scd(4)

[John Baldwin]

This patch adds locking to scd(4) and marks it MPSAFE.  It also uses bus_*() 
instead of bus_space_*().  The patch is against HEAD but probably applies to 9 
and 10 as well.

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

-- 
John Baldwin