linux-kernel - Re: [PATCH V2] workqueue: fix possible race condition when rescuer VS pwq-release

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Date:	Tue, 15 Apr 2014 12:47:52 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] workqueue: fix possible race condition when rescuer
 VS pwq-release

On Fri, Mar 28, 2014 at 08:07:58PM +0800, Lai Jiangshan wrote:
> +static inline void get_unbound_pwq(struct pool_workqueue *pwq)
> +{
> +	if (pwq->wq->flags & WQ_UNBOUND)
> +		get_pwq(pwq);
> +}
> +
>  /**
>   * put_pwq - put a pool_workqueue reference
>   * @pwq: pool_workqueue to put
> @@ -1075,6 +1081,12 @@ static void put_pwq(struct pool_workqueue *pwq)
>  	schedule_work(&pwq->unbound_release_work);
>  }
>  
> +static inline void put_unbound_pwq(struct pool_workqueue *pwq)
> +{
> +	if (pwq->wq->flags & WQ_UNBOUND)
> +		put_pwq(pwq);
> +}

Ugh... please drop these helpers.

> +		get_unbound_pwq(pwq);

Why not just do get_pwq() here?

Thanks.

-- 
tejun
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