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SubjectRe: [rfc PATCH] ieee1394: ohci1394: delete bogus spinlock, flush MMIO writes
On Tue, 28 Nov 2006 22:24:11 +0100 (CET)
Stefan Richter <stefanr@s5r6.in-berlin.de> wrote:

> All MMIO writes which were surrounded by the spinlock as well as the
> very last MMIO write of the IRQ handler are now explicitly flushed by
> MMIO reads of the respective register.

MMIO is ordered anyway on the bus, you just need mmiowb() to force
ordering to the bus controller in case you are on a big numa box.
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