Date: Wed, 23 May 2007 16:04:15 -0700 (PDT)
Message-Id: <20070523.160415.26274543.davem@davemloft.net>
To: torvalds@linux-foundation.org
Cc: jbarnes@virtuousgeek.org, hancockr@shaw.ca, galibert@pobox.com,
       linux-kernel@vger.kernel.org, ak@suse.de, cebbert@redhat.com,
       lenb@kernel.org
Subject: Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI
 motherboard resources
From: David Miller <davem@davemloft.net>
In-Reply-To: <alpine.LFD.0.98.0705231514410.3890@woody.linux-foundation.org>
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	<200705231506.36229.jbarnes@virtuousgeek.org>
	<alpine.LFD.0.98.0705231514410.3890@woody.linux-foundation.org>
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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 23 May 2007 15:16:23 -0700 (PDT)

> That crap should be seen for the crap it is! Dammit, how hard can it
> be to just admit that mmconfig isn't that great?

I knew mmconfig was broken conceptually the first time I started
seeing write posting "bug fixes" for it that would do a read back from
PCI config space via mmconfig to post the write, which of course has
potential side-effects on the device and is absolutely illegal if the
write just performed put the device into a PM state or whatever.

Truth is stranger than fiction at times.

MMCONFIG is very much an ill-conceived idea.

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