linux-kernel - Re: [PATCH 02/29] x86/pci: intel ioh bus num reg accessing fix

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Date:	Mon, 4 Jan 2010 08:44:56 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 02/29] x86/pci: intel ioh bus num reg accessing fix

On Sun, Jan 03, 2010 at 07:04:40PM -0800, Yinghai Lu wrote:
> it is above 0x100, so if mmconf is not enable, need to skip it
> 
> Reported-by: Jens Axboe <jens.axboe@...cle.com>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  arch/x86/pci/intel_bus.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/pci/intel_bus.c b/arch/x86/pci/intel_bus.c
> index b7a55dc..baf283a 100644
> --- a/arch/x86/pci/intel_bus.c
> +++ b/arch/x86/pci/intel_bus.c
> @@ -49,6 +49,10 @@ static void __devinit pci_root_bus_res(struct pci_dev *dev)
>  	u64 mmioh_base, mmioh_end;
>  	int bus_base, bus_end;
>  
> +	/* some sys doesn't get mmconf enabled */
> +	if (dev->cfg_size < 0x200)

Here we check under the 512 index.. but the comment states
that the check should be above 256 index? Should the comment say
"it is above 0x200, so if mmconf.."?
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