Cc: Michael Schmitz <schmitzmic@xxxxxxxxx>, Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>, Hannes Reinecke <hare@xxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, "David S . Miller" <davem@xxxxxxxxxxxxx>
Mostly to avoid methods calls for dma mapping, but also to tidy up
a few bits found while doing that.
