workqueue: remove the lock from wq_sysfs_prep_attrs()
Reading to wq->unbound_attrs requires protection of either wq_pool_mutex or wq->mutex, and wq_sysfs_prep_attrs() is called with wq_pool_mutex held, so we don't need to grab wq->mutex here. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -4937,13 +4937,13 @@ static struct workqueue_attrs *wq_sysfs_prep_attrs(struct workqueue_struct *wq)
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{
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struct workqueue_attrs *attrs;
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lockdep_assert_held(&wq_pool_mutex);
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attrs = alloc_workqueue_attrs(GFP_KERNEL);
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if (!attrs)
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return NULL;
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mutex_lock(&wq->mutex);
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copy_workqueue_attrs(attrs, wq->unbound_attrs);
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mutex_unlock(&wq->mutex);
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return attrs;
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}
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