linux-kernel - Re: [PATCH] x86: SB450: skip IRQ0 override if it is not routed to INT2 of IOAPIC

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Date:	Tue, 7 Oct 2008 05:41:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andreas Herrmann <andreas.herrmann3@....com>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	Jason Vas Dias <jason.vas.dias@...il.com>
Subject: Re: [PATCH] x86: SB450: skip IRQ0 override if it is not routed to
	INT2 of IOAPIC


* Andreas Herrmann <andreas.herrmann3@....com> wrote:

> So, let's work around BIOS bugs in Linux then ...
> 
> Following patch is almost untested -- especially I didn't get my hands 
> on one of the HP Laptops with broken DSDT.
[...]
> On some HP nx6... laptops (e.g. nx6325) BIOS reports an IRQ0 override 
> but the SB450 chipset is configured such that timer interrupts goe to 
> INT0 of IOAPIC.
> 
> Check IRQ0 routing and if it is routed to INT0 of IOAPIC skip the 
> timer override.
> 
> Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
>
> ---
>  arch/x86/kernel/early-quirks.c |   48 ++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 48 insertions(+), 0 deletions(-)

very nice, thanks Andreas! Applied to tip/x86/quirks. This PCI ID based 
quirk should be more complete than DMI matches.

	Ingo
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