Sam Leffler 4b539f02f5 Correct cache handling for xfer requests marked URQ_REQUEST: many (if not
all uses) involve a read but usbd_start_transfer only does a PREWRITE; change
this to BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE as I'm not sure if any
users do write+read.

Reviewed by:	cognet, imp
MFC after:	1 month
2008-03-20 16:04:13 +00:00
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