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

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Date:	Wed, 23 May 2007 13:45:05 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Robert Hancock <hancockr@...w.ca>,
	Olivier Galibert <galibert@...ox.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Chuck Ebbert <cebbert@...hat.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard
 resources



On Wed, 23 May 2007, Alan Cox wrote:
>
> > Well, the thing is, I'm pretty sure there is at least one northbridge that 
> > stops memory accesses from the CPU when you turn off the MEM bit on it. 
> > Oops, you just killed the machine.
> 
> CS5520. But it doesn't have 64bit or PCI Express.

That patch does it for _all_ PCI probing. So it would turn any machine 
using that northbridge into a brick.

		Linus
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