linux-kernel - Re: [3.11.4] Thunderbolt/PCI unplug oops in pci_pme_list

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Date:	Wed, 30 Oct 2013 23:48:24 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Andreas Noever <andreas.noever@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [3.11.4] Thunderbolt/PCI unplug oops in pci_pme_list_scan

On Wed, Oct 30, 2013 at 12:57 AM, Yijing Wang <wangyijing@...wei.com> wrote:
>>>> Bisection points to 928bea964827d7824b548c1f8e06eccbbc4d0d7d .
>>>
>>> This is "PCI: Delay enabling bridges until they're needed" by Yinghai.
>>
>> that double disabling should be addressed by:
>>
>> https://lkml.org/lkml/2013/4/25/608
>>
>> [PATCH] PCI: Remove duplicate pci_disable_device for pcie port
>
> Hi Yinghai and Bjorn,
>    I found a related issue in the latest Bjorn/pci-next branch.
>
> Now if we remove the pcie port device in the system, there is a warning occured.
> It seems introduced after commit 928bea9 "PCI: Delay enabling bridges until they're needed".
>
> [ 2124.129478] ------------[ cut here ]------------
> [ 2124.129490] WARNING: CPU: 3 PID: 7 at drivers/pci/pci.c:1424 pci_disable_device+0x90/0xa0()
> [ 2124.129492] Device pcieport
> [ 2124.129492] disabling already-disabled device

yes. that is pcie port driver problem.

| 928bea delay bridge enabling, and it's pci_is_enabled checking will prevent
| pci bridge get enabled second time, so enable_cnt will be only 1. instead of
| 2. if we enable bridge at first and then pcie port driver.
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