[PATCH] Various smbus(4) driver fixups and locking

The patch below fixes various nits (mostly adding locking) in most of the 
smbus controller drivers we have in the tree.  It should apply to both HEAD 
and RELENG_6 with the exception that the intpm(4) driver will require the 
style fixes to be applied to RELENG_6 first.  If you aren't using intpm and 
want to test on RELENG_6, you can just ignore that part of the patch.  Please 
test, thanks.

http://www.FreeBSD.org/~jhb/patches/smbus_locking.patch

-- 
John Baldwin