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workqueue: move rescuer pool detachment to the end

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In 51697d3939 ("workqueue: use generic attach/detach routine for
rescuers"), The rescuer detaches itself from the pool before put_pwq()
so that the put_unbound_pool() will not destroy the rescuer-attached
pool.

It is unnecessary.  worker_detach_from_pool() can be used as the last
statement to access to the pool just like the regular workers,
put_unbound_pool() will wait for it to detach and then free the pool.

So we move the worker_detach_from_pool() down, make it coincide with
the regular workers.

tj: Minor description update.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Lai Jiangshan 2014-07-22 13:03:47 +08:00 committed by Tejun Heo
parent 051e185010
commit 13b1d625ef
1 changed files with 6 additions and 8 deletions
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14
kernel/workqueue.c
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@ -2253,15 +2253,10 @@ static int rescuer_thread(void *__rescuer)
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
* go away while we're holding its lock.
* go away while we're still attached to it.
*/
put_pwq(pwq);
@ -2274,8 +2269,11 @@ static int rescuer_thread(void *__rescuer)
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);
}
spin_unlock_irq(&wq_mayday_lock);