From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Thomas Renninger <trenn@suse.de>
Subject: Re: [PATCH] x86/PCI: ignore Consumer/Producer bit in ACPI window descriptions
Date: Thu, 8 Apr 2010 09:25:55 -0700 [thread overview]
Message-ID: <20100408092555.7933716a@virtuousgeek.org> (raw)
In-Reply-To: <20100406192408.14676.17106.stgit@bob.kio>
On Tue, 06 Apr 2010 13:24:08 -0600
Bjorn Helgaas <bjorn.helgaas@hp.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@hp.com>
> ---
Applied to my for-linus branch, thanks.
--
Jesse Barnes, Intel Open Source Technology Center
prev parent reply other threads:[~2010-04-08 16:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-06 19:24 Bjorn Helgaas
2010-04-08 16:25 ` Jesse Barnes [this message]
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