linux-kernel - Re: [PATCH RFC v1 2/3] Fix hibernation restore hang in freeze

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Message-ID: <CACVXFVMN_uijYRj9CCKHbnM40YVyp8ar7mp4g=s70gv8YmFCLA@mail.gmail.com>
Date:	Mon, 24 Feb 2014 15:09:38 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Sebastian Capella <sebastian.capella@...aro.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PM List <linux-pm@...r.kernel.org>,
	linaro-kernel@...ts.linaro.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Russ Dill <Russ.Dill@...com>
Subject: Re: [PATCH RFC v1 2/3] Fix hibernation restore hang in freeze_processes

On Wed, Feb 19, 2014 at 9:52 AM, Sebastian Capella
<sebastian.capella@...aro.org> wrote:
> During restore, pm_notifier chain are called with
> PM_RESTORE_PREPARE.  The firmware_class driver handler
> fw_pm_notify does not have a handler for this.  As a result,
> it keeps a reader on the kmod.c umhelper_sem.  During
> freeze_processes, the call to __usermodehelper_disable tries to
> take a write lock on this semaphore and hangs waiting.
>
> Signed-off-by: Sebastian Capella <sebastian.capella@...aro.org>
> Cc: Russ Dill <Russ.Dill@...com>
> Cc: Ming Lei <ming.lei@...onical.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Acked-by: Ming Lei <ming.lei@...onical.com>

Thanks,
--
Ming Lei
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