linux-kernel - Re: [PATCH pm-freezer 3/4] freezer: check freezing() before leaving FROZEN state

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Message-ID: <20110829172132.GA12191@redhat.com>
Date:	Mon, 29 Aug 2011 19:21:32 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Paul Menage <paul@...lmenage.org>,
	containers@...ts.linux-foundation.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH pm-freezer 3/4] freezer: check freezing() before
	leaving FROZEN state

On 08/29, Oleg Nesterov wrote:
>
> Hmm. But I got lost a bit. Why do we need freezer_lock to set/clear
> PF_FROZEN ? OK, the code below takes freezer_lock for freezing().
> Is there any other reason?

Ah, at least we need it to serialize with __thaw_task() which does
"if (frozen) wake_up()".

Oleg.

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