This patch ensures that iopdir updates are visible on the bus
before we return a DMA mapping.  Without this there is a small
window where the chipset could fetch an invalid iodpir entry
from memory.  As Grant mentioned before, we've only seen this
problem exposed with multiple tulip NICs under load.  Bjorn,
please apply.  Working on something for 2.5... (more extensive
updates)  Thanks,

	Alex

--
Alex Williamson                             HP Linux & Open Source Lab