K 10
svn:author
V 7
thompsa
K 8
svn:date
V 27
2008-07-28T16:09:22.316105Z
K 7
svn:log
V 374
MFC r177459

 Workaround design botch in usb: blindly mixing bus_dma with PIO does not
 work on architectures with a write-back cache as the PIO writes end up
 in the cache which the sync(BUS_DMASYNC_POSTREAD) in usb_transfer_complete
 then discards; compensate in the xfer methods that do PIO by pushing the
 writes out of the cache before usb_transfer_complete is called.

END