linux-kernel - Re: [Bugme-new] [Bug 14003] New: Infinite loop on bootup while handling DMAR

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Message-Id: <1250754748.8974.17.camel@macbook.infradead.org>
Date:	Thu, 20 Aug 2009 08:52:28 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Faidon Liambotis <paravoid@...ian.org>,
	Matt Domsch <Matt_Domsch@...l.com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, bero@...linux.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 14003] New: Infinite loop on bootup while
 handling DMAR

On Wed, 2009-08-19 at 14:26 -0700, Andrew Morton wrote:
> > http://bugzilla.kernel.org/show_bug.cgi?id=14003
> >            Summary: Infinite loop on bootup while handling DMAR
> 
> That's a box-killing post-2.6.30 regression.

It's a BIOS bug -- the user's BIOS is written by idiots who obviously
shipped it without any QA whatsoever.

As far as I can tell, 2.6.30 aborted early because of a _different_ BIOS
bug, but now we cope with that particular bug and we fall over the next
bug. Or just come across them in a different order.

The IOMMU on this board can _never_ have worked. Just disable it.

Or use a board with open source firmware available, and this kind of
crap won't happen. (At least if it does, you'll be able to fix it).

-- 
dwmw2

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