linux-kernel - Re: Ordering between PCI config space writes and MMIO reads?

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Message-ID: <ada3b9cbi4l.fsf@cisco.com>
Date:	Wed, 25 Oct 2006 07:11:06 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Grant Grundler <grundler@...isc-linux.org>
Cc:	linux-pci@...ey.karlin.mff.cuni.cz, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, openib-general@...nib.org,
	John Partridge <johnip@....com>
Subject: Re: Ordering between PCI config space writes and MMIO reads?

 > I'm looking at arch/ia64/pci/pci.c.
 > Wouldn't it be reasonable to include memory barriers around calls
 > to SAL config space access functions?

It's reasonable, but is there a memory barrier strong enough to
guarantee that a config write has actually completed?

 - R.
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