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workqueue: correct handling of the pool spin_lock

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When we fail to mutex_trylock(), we release the pool spin_lock and do
mutex_lock(). After that, we should regrab the pool spin_lock, but,
regrabbing is missed in current code. So correct it.

Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Joonsoo Kim 2013-05-01 00:07:00 +09:00 committed by Tejun Heo
parent d325185916
commit 8f174b1175
1 changed files with 1 additions and 0 deletions
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kernel/workqueue.c
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@ -2059,6 +2059,7 @@ static bool manage_workers(struct worker *worker)
if (unlikely(!mutex_trylock(&pool->manager_mutex))) {
spin_unlock_irq(&pool->lock);
mutex_lock(&pool->manager_mutex);
spin_lock_irq(&pool->lock);
ret = true;
}