linux-kernel - Re: [PATCH] x86/PCI: ignore Consumer/Producer bit in ACPI window descriptions

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Message-ID: <20100408092555.7933716a@virtuousgeek.org>
Date:	Thu, 8 Apr 2010 09:25:55 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH] x86/PCI: ignore Consumer/Producer bit in ACPI window
 descriptions

On Tue, 06 Apr 2010 13:24:08 -0600
Bjorn Helgaas <bjorn.helgaas@...com> wrote:

> 
> ACPI Address Space Descriptors (used in _CRS) have a Consumer/Producer
> bit that is supposed to distinguish regions that are consumed directly
> by a device from those that are forwarded ("produced") by a bridge.
> But BIOSes have apparently not used this consistently, and Windows
> seems to ignore it, so I think Linux should ignore it as well.
> 
> I can't point to any of these supposed broken BIOSes, but since we
> now rely on _CRS by default, I think it's safer to ignore this bit
> from the start.
> 
> Here are details of my experiments with how Windows handles it:
>     https://bugzilla.kernel.org/show_bug.cgi?id=15701
> 
> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>
> ---

Applied to my for-linus branch, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center
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