linux-kernel - Re: [linux-pm] PM: cannot hibernate -- BUG at kernel/workqueue.c:3659

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Date:	Wed, 25 Jan 2012 23:00:12 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, Baohua.Song@....com,
	Tejun Heo <tj@...nel.org>, "pavel@....cz" <pavel@....cz>
Subject: Re: [linux-pm] PM: cannot hibernate -- BUG at	kernel/workqueue.c:3659

On 01/25/2012 05:00 PM, Srivatsa S. Bhat wrote:
> So, Jiri, can you please try the following patch and see if it works for
> you as expected? I'll be happy to provide a formal patch with a changelog
> if this works.

FWIW it works, thanks. If you want me test a proper fix, jsut let me know.

> ---
>  kernel/workqueue.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index bec7b5b..cb26c5d 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -3656,7 +3656,9 @@ void freeze_workqueues_begin(void)
>  
>  	spin_lock(&workqueue_lock);
>  
> -	BUG_ON(workqueue_freezing);
> +	if (workqueue_freezing)
> +		goto out_unlock;
> +
>  	workqueue_freezing = true;
>  
>  	for_each_gcwq_cpu(cpu) {
> @@ -3678,6 +3680,7 @@ void freeze_workqueues_begin(void)
>  		spin_unlock_irq(&gcwq->lock);
>  	}
>  
> +out_unlock:
>  	spin_unlock(&workqueue_lock);
>  }
>  


-- 
js
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