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

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Date:	Thu, 27 Oct 2011 15:54:20 +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
Subject: Re: [PATCH 4/6 v2] PM: Limit race conditions between runtime PM and
 system sleep (v2)

2011/6/29 Rafael J. Wysocki <rjw@...k.pl>:

> One of the roles of the PM core is to prevent different PM callbacks
> executed for the same device object from racing with each other.
> Unfortunately, after commit e8665002477f0278f84f898145b1f141ba26ee26
> (PM: Allow pm_runtime_suspend() to succeed during system suspend)
> runtime PM callbacks may be executed concurrently with system
> suspend/resume callbacks for the same device.
(...)
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

A quick question: is there some specific reason why this patch should
not go into the 3.0.y stable releases? 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.

Yours,
Linus Walleij
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