workqueue: use cwq_set_max_active() helper for workqueue_set_max_active()

workqueue_set_max_active() may increase ->max_active without
activating delayed works and may make the activation order differ from
the queueing order.  Both aren't strictly bugs but the resulting
behavior could be a bit odd.

To make things more consistent, use cwq_set_max_active() helper which
immediately makes use of the newly increased max_mactive if there are
delayed work items and also keeps the activation order.

tj: Slight update to description.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index b5d722548ff..4f5c61f8b0e 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3413,7 +3413,7 @@ void workqueue_set_max_active(struct workqueue_struct *wq, int max_active)
 
                 if (!(wq->flags & WQ_FREEZABLE) ||
                     !(gcwq->flags & GCWQ_FREEZING))
-                        get_cwq(gcwq->cpu, wq)->max_active = max_active;
+                        cwq_set_max_active(get_cwq(gcwq->cpu, wq), max_active);
 
                 spin_unlock_irq(&gcwq->lock);
         }