linux-kernel - Re: [PATCH] workqueue: detach rescuer from pool until the last

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Date:	Fri, 18 Jul 2014 18:51:59 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workqueue: detach rescuer from pool until the last

Hello,

On Wed, Jul 16, 2014 at 02:56:50PM +0800, Lai Jiangshan wrote:
> @@ -2300,11 +2300,6 @@ repeat:
>  				move_linked_works(work, scheduled, &n);
>  
>  		process_scheduled_works(rescuer);
> -		spin_unlock_irq(&pool->lock);
> -
> -		worker_detach_from_pool(rescuer, pool);
> -
> -		spin_lock_irq(&pool->lock);
>  
>  		/*
>  		 * Put the reference grabbed by send_mayday().  @pool won't
> @@ -2322,8 +2317,11 @@ repeat:
>  			wake_up_worker(pool);
>  
>  		rescuer->pool = NULL;
> -		spin_unlock(&pool->lock);
> -		spin_lock(&wq_mayday_lock);
> +		spin_unlock_irq(&pool->lock);
> +
> +		worker_detach_from_pool(rescuer, pool);
> +
> +		spin_lock_irq(&wq_mayday_lock);

Can you please also update the comment above put_pwq() and explain
above detach that @pool will stay around till detach is complete?

Thanks.

-- 
tejun
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