linux-kernel - Re: [PATCH V3] workqueue: fix double unlock bug

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Message-ID: <534CA87A.6050106@cn.fujitsu.com>
Date:	Tue, 15 Apr 2014 11:33:14 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Daeseok Youn <daeseok.youn@...il.com>
CC:	<tj@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3] workqueue: fix double unlock bug

Hi, Tejun

Acked-by: Lai Jiangshan <laijs@...fujitsu.com>
CC: stable@...nel.org

Thanks,
Lai

On 04/15/2014 07:17 AM, Daeseok Youn wrote:
> 
> Use default pwq when alloc_unbound_pwq() is failed.
> 
> And remove "if" condition for whether "pwq" is same as "wq->dfl_pwq"
> when wq_calc_node_cpumask() returns false and just use "goto use_dfl_pwq"
> 
> Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
> ---
> V2: replace "if condition" with "goto" as Lai's comment.
> V3: Use default pwq when alloc_unbound_pwq() is failed.
> 
>  kernel/workqueue.c |    8 +++-----
>  1 files changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 0ee63af..0679854 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -4087,10 +4087,7 @@ static void wq_update_unbound_numa(struct workqueue_struct *wq, int cpu,
>  		if (cpumask_equal(cpumask, pwq->pool->attrs->cpumask))
>  			goto out_unlock;
>  	} else {
> -		if (pwq == wq->dfl_pwq)
> -			goto out_unlock;
> -		else
> -			goto use_dfl_pwq;
> +		goto use_dfl_pwq;
>  	}
>  
>  	mutex_unlock(&wq->mutex);
> @@ -4100,7 +4097,8 @@ static void wq_update_unbound_numa(struct workqueue_struct *wq, int cpu,
>  	if (!pwq) {
>  		pr_warning("workqueue: allocation failed while updating NUMA affinity of \"%s\"\n",
>  			   wq->name);
> -		goto out_unlock;
> +		mutex_lock(&wq->mutex);
> +		goto use_dfl_pwq;
>  	}
>  
>  	/*

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