diff options
Diffstat (limited to 'kernel/workqueue.c')
| -rw-r--r-- | kernel/workqueue.c | 36 |
1 files changed, 23 insertions, 13 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 3825c14304e..d9a4aeb844d 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1057,6 +1057,25 @@ static void put_pwq(struct pool_workqueue *pwq) schedule_work(&pwq->unbound_release_work); } +/** + * put_pwq_unlocked - put_pwq() with surrounding pool lock/unlock + * @pwq: pool_workqueue to put (can be %NULL) + * + * put_pwq() with locking. This function also allows %NULL @pwq. + */ +static void put_pwq_unlocked(struct pool_workqueue *pwq) +{ + if (pwq) { + /* + * As both pwqs and pools are sched-RCU protected, the + * following lock operations are safe. + */ + spin_lock_irq(&pwq->pool->lock); + put_pwq(pwq); + spin_unlock_irq(&pwq->pool->lock); + } +} + static void pwq_activate_delayed_work(struct work_struct *work) { struct pool_workqueue *pwq = get_work_pwq(work); @@ -3759,12 +3778,7 @@ int apply_workqueue_attrs(struct workqueue_struct *wq, mutex_unlock(&wq->mutex); - if (last_pwq) { - spin_lock_irq(&last_pwq->pool->lock); - put_pwq(last_pwq); - spin_unlock_irq(&last_pwq->pool->lock); - } - + put_pwq_unlocked(last_pwq); ret = 0; /* fall through */ out_free: @@ -3979,16 +3993,12 @@ void destroy_workqueue(struct workqueue_struct *wq) } else { /* * We're the sole accessor of @wq at this point. Directly - * access the first pwq and put the base ref. As both pwqs - * and pools are sched-RCU protected, the lock operations - * are safe. @wq will be freed when the last pwq is - * released. + * access the first pwq and put the base ref. @wq will be + * freed when the last pwq is released. */ pwq = list_first_entry(&wq->pwqs, struct pool_workqueue, pwqs_node); - spin_lock_irq(&pwq->pool->lock); - put_pwq(pwq); - spin_unlock_irq(&pwq->pool->lock); + put_pwq_unlocked(pwq); } } EXPORT_SYMBOL_GPL(destroy_workqueue); |