linux-kernel - Re: [rfc PATCH] ieee1394: ohci1394: delete bogus spinlock, flush MMIO writes

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Message-ID: <20061128215621.2e0ac9a6@localhost.localdomain>
Date:	Tue, 28 Nov 2006 21:56:21 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [rfc PATCH] ieee1394: ohci1394: delete bogus spinlock, flush
 MMIO writes

On Tue, 28 Nov 2006 22:24:11 +0100 (CET)
Stefan Richter <stefanr@...6.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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