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-rw-r--r--kernel/workqueue.c36
1 files changed, 23 insertions, 13 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 3825c14..d9a4aeb 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);
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