linux-kernel - Re: [PATCH 3/3] PM: Limit race conditions between runtime PM and system sleep

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Message-ID: <20110628235643.4cf7cff0@tom-ThinkPad-T410>
Date:	Tue, 28 Jun 2011 23:56:43 +0800
From:	Ming Lei <tom.leiming@...il.com>
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
Subject: Re: [PATCH 3/3] PM: Limit race conditions between runtime PM and
 system sleep


Hi Rafael,

On Sun, 26 Jun 2011 00:56:31 +0200
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> Index: linux-2.6/Documentation/power/runtime_pm.txt
> ===================================================================
> --- linux-2.6.orig/Documentation/power/runtime_pm.txt
> +++ linux-2.6/Documentation/power/runtime_pm.txt
> @@ -567,6 +567,11 @@ this is:
>  	pm_runtime_set_active(dev);
>  	pm_runtime_enable(dev);
>  
> +The PM core always increments the run-time usage counter before calling the
> +->suspend() callback and decrements it after calling the ->resume() callback.
> +Hence disabling run-time PM temporarily like this will not cause any run-time
> +suspend callbacks to be lost.

Could you explain why the above is that "this will not cause any run-time suspend
callbacks to be lost"? 

Looks like it should be "this will not cause any run-time suspend callbacks to
be called", but not sure.


thanks,
-- 
Ming Lei
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