linux-kernel - Re: [REGRESSION][v3.4-rc1] PCI: add a PCI resource reallocation config option

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Message-ID: <5298D99A.5040304@canonical.com>
Date:	Fri, 29 Nov 2013 13:14:50 -0500
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Tim Gardner <tim.gardner@...onical.com>
Subject: Re: [REGRESSION][v3.4-rc1] PCI: add a PCI resource reallocation config
 option

On 11/28/2013 02:17 AM, Yinghai Lu wrote:
> On Wed, Nov 27, 2013 at 12:22 PM, Joseph Salisbury
> <joseph.salisbury@...onical.com> wrote:
>> Hi Yinghai,
>>
>> A kernel bug was opened against Ubuntu [0].  After a kernel bisect, it
>> was found that the following commit introduced the bug:
>>
>> commit b07f2ebc109b607789f648dedcff4b125f9afec6
>> Author: Yinghai Lu <yinghai@...nel.org>
>> Date:   Thu Feb 23 19:23:32 2012 -0800
>>
>>     PCI: add a PCI resource reallocation config option
>>
>>
>>
>> The regression was introduced as of v3.4-rc1 and also exists in current
>> mainline.
>>
>> The bug seems platform specific since we have not had allot of other
>> reports.  The bug is preventing ixgbe to probe Intel x520 NIC's.
>>
>> It would be easy enough to disable the PCI_REALLOC_ENABLE_AUTO config
>> option, but I wanted to get your feedback since you are the author.  It
>> looks like the bug reporter may also be able to work around the problem
>> with the pci=realloc=.
> The bios has problem to have two functions rom bar to same place, and
> root bus does
> not enough mmio range and confuse realloc logic.
>
> Please try attached patches to top of linus's tree, or your internal tree.
>
> Thanks
>
> Yinghai
Thanks so much for the patches, Yinghai.  I'll report back with the
testing results.

Thanks,

Joe
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