From 983ca25e738ee0c9c5435a503a6bb0034d4552b0 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 13 Mar 2013 16:51:35 -0700 Subject: workqueue: fix max_active handling in init_and_link_pwq() Since 9e8cd2f589 ("workqueue: implement apply_workqueue_attrs()"), init_and_link_pwq() may be called to initialize a new pool_workqueue for a workqueue which is already online, but the function was setting pwq->max_active to wq->saved_max_active without proper synchronization. Fix it by calling pwq_adjust_max_active() under proper locking instead of manually setting max_active. Signed-off-by: Tejun Heo --- kernel/workqueue.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 9e2ec4ca415a..756761480a1a 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -3771,21 +3771,25 @@ static void init_and_link_pwq(struct pool_workqueue *pwq, pwq->wq = wq; pwq->flush_color = -1; pwq->refcnt = 1; - pwq->max_active = wq->saved_max_active; INIT_LIST_HEAD(&pwq->delayed_works); INIT_LIST_HEAD(&pwq->mayday_node); INIT_WORK(&pwq->unbound_release_work, pwq_unbound_release_workfn); - /* - * Link @pwq and set the matching work_color. This is synchronized - * with flush_mutex to avoid confusing flush_workqueue(). - */ mutex_lock(&wq->flush_mutex); spin_lock_irq(&workqueue_lock); + /* + * Set the matching work_color. This is synchronized with + * flush_mutex to avoid confusing flush_workqueue(). + */ if (p_last_pwq) *p_last_pwq = first_pwq(wq); pwq->work_color = wq->work_color; + + /* sync max_active to the current setting */ + pwq_adjust_max_active(pwq); + + /* link in @pwq */ list_add_rcu(&pwq->pwqs_node, &wq->pwqs); spin_unlock_irq(&workqueue_lock); -- cgit v1.2.3