linux-kernel - Re: [PATCH pm-freezer 4/4] freezer: use lock_task_sighand() in fake_signal_wake

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Message-ID: <20110829163647.GC9973@redhat.com>
Date:	Mon, 29 Aug 2011 18:36:47 +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 4/4] freezer: use lock_task_sighand() in
	fake_signal_wake_up()

On 08/29, Tejun Heo wrote:
>
> --- work.orig/kernel/freezer.c
> +++ work/kernel/freezer.c
> @@ -103,9 +103,10 @@ static void fake_signal_wake_up(struct t
>  {
>  	unsigned long flags;
>  
> -	spin_lock_irqsave(&p->sighand->siglock, flags);
> -	signal_wake_up(p, 0);
> -	spin_unlock_irqrestore(&p->sighand->siglock, flags);
> +	if (lock_task_sighand(p, &flags)) {
> +		signal_wake_up(p, 0);
> +		unlock_task_sighand(p, &flags);
> +	}

Yes, this looks correct.

Oleg.

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