linux-kernel - Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources

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Date:	Wed, 23 May 2007 16:04:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...ux-foundation.org
Cc:	jbarnes@...tuousgeek.org, hancockr@...w.ca, galibert@...ox.com,
	linux-kernel@...r.kernel.org, ak@...e.de, cebbert@...hat.com,
	lenb@...nel.org
Subject: Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI
 motherboard resources

From: Linus Torvalds <torvalds@...ux-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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