linux-kernel - Re: [tip:x86/pci] x86, pci: Ignore any PCI BARs that match an HPET we already know about

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Message-ID: <4C9A88F3.7080802@linux.intel.com>
Date:	Wed, 22 Sep 2010 15:53:39 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Yinghai Lu <yinghai@...nel.org>, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, simon@...e.lp0.eu,
	tglx@...utronix.de, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/pci] x86, pci: Ignore any PCI BARs that match an HPET
 we already know about

On 09/22/2010 03:41 PM, Bjorn Helgaas wrote:
>>
>> It seems there is some problem here:
>>
>> hpet_res is inserted to resource with late_initcall().
>> so if you don't touch that hpet address in bar and not put in the resource.
>> kernel could allocate that address to other devices that doesn't get resource from BIOS.
> 
> Hmm, yes, that's a problem.  Let me look into it tomorrow; maybe we
> can do something like setting IORESOURCE_PCI_FIXED instead of just
> clearing out the resource.
> 
> Bjorn

OK, dropping the patch for now.

	-hpa
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