linux-kernel - Re: [PATCH] PCI: Remove not needed check in disable aspm link

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Date:	Tue, 2 Apr 2013 14:10:18 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Roman Yepishev <roman.yepishev@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>
Subject: Re: [PATCH] PCI: Remove not needed check in disable aspm link

On Mon, Apr 1, 2013 at 6:03 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Mon, Apr 1, 2013 at 4:52 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> On Fri, Mar 29, 2013 at 11:04:48AM -0700, Yinghai Lu wrote:
>>> attatched -v3 again
>>>
>>> > Please check attached -v3.
>>
>> It's getting late in the v3.9 cycle already, and while your v3 patch
>> probably fixes Roman's problem, I can't convince myself that it is
>> safe in general.
>>
>> I think the safest thing to do at this point is to revert 8c33f51df
>> ("PCI/ACPI: Request _OSC control before scanning PCI root bus") with a
>> patch like the one below.
>
> Agreed.
>
>>
>> That does mean the booting path and hotplug paths will be different (we set
>> aspm_disabled after boot but before hotplug), but it was that way for a
>> long time before 8c33f51df.  I think it's more important to fix this recent
>> ath5k regression than to fix a long-standing hotplug bug that nobody ever
>> complained about.
>>
>> Obviously, I think we should fix the hotplug bug and clean up the ASPM
>> mess, too.  But we need to do that when we have more time to do it right
>> and test it.
>
> Sure.
>
>>
>> Bjorn
>>
>>
>> commit 96e5d01cd536458435ef0678d9fa3dc542afb41f
>> Author: Bjorn Helgaas <bhelgaas@...gle.com>
>> Date:   Mon Apr 1 15:47:39 2013 -0600
>>
>>     Revert "PCI/ACPI: Request _OSC control before scanning PCI root bus"
>>
>>     This reverts commit 8c33f51df406e1a1f7fa4e9b244845b7ebd61fa6.
>>
>>     Conflicts:
>>         drivers/acpi/pci_root.c
>>
>>     Reference: https://bugzilla.kernel.org/show_bug.cgi?id=55211
>>     Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
>
> Acked-by: Yinghai Lu <yinghai@...nel.org>
>
> stable need this reverting too.

I updated the changelog and added this to my for-linus branch, headed for v3.9.
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