linux-kernel - Re: [PATCH 4/6 v2] PM: Limit race conditions between runtime PM and system sleep (v2)

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Date:	Fri, 28 Oct 2011 22:00:01 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg KH <greg@...ah.com>, LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Kevin Hilman <khilman@...com>, linux-scsi@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>, stable@...nel.org,
	Ulf Hansson <Ulf.Hansson@...ricsson.com>
Subject: Re: [PATCH 4/6 v2] PM: Limit race conditions between runtime PM and
 system sleep (v2)

On Thu, Oct 27, 2011 at 10:06 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:

>> We are trying to produce
>> a runtime PM system of product quality based on 3.0.y and we've
>> already had to backport this patch ourselves to get things stable.
>>
>> We have also backported:
>> PM: Introduce generic "noirq" callback routines for subsystems (v2)
>> PM / Runtime: Update documentation of interactions with system sleep
>> PM / Runtime: Add new helper function: pm_runtime_status_suspended()
>>
>> And now it seems to be sufficient to get this thing going.
>
> Well, it isn't a simple fix and it changes the code's behavior quite
> significantly, so I thought it might not be a good idea to risk problems
> with -stable because of it.  Perhaps let's see how it works out in 3.1
> and backport it later if there are no problem reports related to it?

OK no hurries, let's give it a spin in 3.1 for some weeks or so.

Yours,
Linus Walleij
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