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

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Date:	Mon, 1 Apr 2013 17:03:41 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
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 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.

Yinghai
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