linux-kernel - Re: [PATCH -mm 2/2] PM: Disable usermode helper before hibernation and suspend

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Date:	Fri, 15 Jun 2007 15:08:52 +0200
From:	Uli Luckas <u.luckas@...d.de>
To:	LKML <linux-kernel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [PATCH -mm 2/2] PM: Disable usermode helper before hibernation and suspend

On Monday, 4. June 2007, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
>
> Use a hibernation and suspend notifier to disable the user mode helper
> before a hibernation/suspend and enable it after the operation.
>
Hi Rafael,
I have a couple of questions, regarding this patch ...
> -	if (!khelper_wq)
> +	if (!khelper_wq || usermodehelper_disabled)
>  		return -EBUSY;
1) how about not returning -EBUSY here, if (wait == UMH_NO_WAIT)?
2) how does your patch prevent wait_for_completion(&done) to hang during
   freezing if usermodehelper_pm_callback is called _after_ the above check?

Regards
Uli
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