[Serious] busdma bug in -current in relation to USB hardware - review wanted

[Hans Petter Selasky]

Hi,

After various feedback from several people I have made a new patch proposal 
that will fix the busdma problem.

See:

http://perforce.freebsd.org/chv.cgi?CH=154181

Review wanted!

I don't know how to patch the psyco interface for SUN. Maybe there is nothing 
that needs to be patched?

--HPS