perform reply buffer dma synchronisation in iop_msg_post(), and not in iop_post(), since we may get in iop_post() without the map being initialized. should affect sparc64 only.
perform reply buffer dma synchronisation in iop_msg_post(), and not in
iop_post(), since we may get in iop_post() without the map being
initialized. should affect sparc64 only.

discussed with and ok'd by mickey@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars