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Merge branch 'for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 

Pull workqueue updates from Tejun Heo:
 "Over the lockdep cross-release churn, workqueue lost some of the
  existing annotations. Johannes Berg restored it and also improved
  them"

* 'for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: re-add lockdep dependencies for flushing
  workqueue: skip lockdep wq dependency in cancel_work_sync()
hifive-unleashed-5.1
Linus Torvalds 2018-08-24 13:16:36 -07:00
parent 18b8bfdfba 87915adc3f
commit 9022ada8ab
1 changed files with 30 additions and 15 deletions
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45
kernel/workqueue.c
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@ -2652,6 +2652,9 @@ void flush_workqueue(struct workqueue_struct *wq)
if (WARN_ON(!wq_online))
return;
lock_map_acquire(&wq->lockdep_map);
lock_map_release(&wq->lockdep_map);
mutex_lock(&wq->mutex);
/*
@ -2843,7 +2846,8 @@ reflush:
}
EXPORT_SYMBOL_GPL(drain_workqueue);
static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr)
static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr,
bool from_cancel)
{
struct worker *worker = NULL;
struct worker_pool *pool;
@ -2885,7 +2889,8 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr)
* workqueues the deadlock happens when the rescuer stalls, blocking
* forward progress.
*/
if (pwq->wq->saved_max_active == 1 || pwq->wq->rescuer) {
if (!from_cancel &&
(pwq->wq->saved_max_active == 1 || pwq->wq->rescuer)) {
lock_map_acquire(&pwq->wq->lockdep_map);
lock_map_release(&pwq->wq->lockdep_map);
}
@ -2896,6 +2901,27 @@ already_gone:
return false;
}
static bool __flush_work(struct work_struct *work, bool from_cancel)
{
struct wq_barrier barr;
if (WARN_ON(!wq_online))
return false;
if (!from_cancel) {
lock_map_acquire(&work->lockdep_map);
lock_map_release(&work->lockdep_map);
}
if (start_flush_work(work, &barr, from_cancel)) {
wait_for_completion(&barr.done);
destroy_work_on_stack(&barr.work);
return true;
} else {
return false;
}
}
/**
* flush_work - wait for a work to finish executing the last queueing instance
* @work: the work to flush
@ -2909,18 +2935,7 @@ already_gone:
*/
bool flush_work(struct work_struct *work)
{
struct wq_barrier barr;
if (WARN_ON(!wq_online))
return false;
if (start_flush_work(work, &barr)) {
wait_for_completion(&barr.done);
destroy_work_on_stack(&barr.work);
return true;
} else {
return false;
}
return __flush_work(work, false);
}
EXPORT_SYMBOL_GPL(flush_work);
@ -2986,7 +3001,7 @@ static bool __cancel_work_timer(struct work_struct *work, bool is_dwork)
* isn't executing.
*/
if (wq_online)
flush_work(work);
__flush_work(work, true);
clear_work_data(work);