+EXPORT_SYMBOL_GPL(kthread_flush_work);
+
+/*
+ * This function removes the work from the worker queue. Also it makes sure
+ * that it won't get queued later via the delayed work's timer.
+ *
+ * The work might still be in use when this function finishes. See the
+ * current_work proceed by the worker.
+ *
+ * Return: %true if @work was pending and successfully canceled,
+ * %false if @work was not pending
+ */
+static bool __kthread_cancel_work(struct kthread_work *work, bool is_dwork,
+ unsigned long *flags)
+{
+ /* Try to cancel the timer if exists. */
+ if (is_dwork) {
+ struct kthread_delayed_work *dwork =
+ container_of(work, struct kthread_delayed_work, work);
+ struct kthread_worker *worker = work->worker;
+
+ /*
+ * del_timer_sync() must be called to make sure that the timer
+ * callback is not running. The lock must be temporary released
+ * to avoid a deadlock with the callback. In the meantime,
+ * any queuing is blocked by setting the canceling counter.
+ */
+ work->canceling++;
+ spin_unlock_irqrestore(&worker->lock, *flags);
+ del_timer_sync(&dwork->timer);
+ spin_lock_irqsave(&worker->lock, *flags);
+ work->canceling--;
+ }
+
+ /*
+ * Try to remove the work from a worker list. It might either
+ * be from worker->work_list or from worker->delayed_work_list.
+ */
+ if (!list_empty(&work->node)) {
+ list_del_init(&work->node);
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * kthread_mod_delayed_work - modify delay of or queue a kthread delayed work
+ * @worker: kthread worker to use
+ * @dwork: kthread delayed work to queue
+ * @delay: number of jiffies to wait before queuing
+ *
+ * If @dwork is idle, equivalent to kthread_queue_delayed_work(). Otherwise,
+ * modify @dwork's timer so that it expires after @delay. If @delay is zero,
+ * @work is guaranteed to be queued immediately.
+ *
+ * Return: %true if @dwork was pending and its timer was modified,
+ * %false otherwise.
+ *
+ * A special case is when the work is being canceled in parallel.
+ * It might be caused either by the real kthread_cancel_delayed_work_sync()
+ * or yet another kthread_mod_delayed_work() call. We let the other command
+ * win and return %false here. The caller is supposed to synchronize these
+ * operations a reasonable way.
+ *
+ * This function is safe to call from any context including IRQ handler.
+ * See __kthread_cancel_work() and kthread_delayed_work_timer_fn()
+ * for details.
+ */
+bool kthread_mod_delayed_work(struct kthread_worker *worker,
+ struct kthread_delayed_work *dwork,
+ unsigned long delay)
+{
+ struct kthread_work *work = &dwork->work;
+ unsigned long flags;
+ int ret = false;
+
+ spin_lock_irqsave(&worker->lock, flags);
+
+ /* Do not bother with canceling when never queued. */
+ if (!work->worker)
+ goto fast_queue;
+
+ /* Work must not be used with >1 worker, see kthread_queue_work() */
+ WARN_ON_ONCE(work->worker != worker);
+
+ /* Do not fight with another command that is canceling this work. */
+ if (work->canceling)
+ goto out;
+
+ ret = __kthread_cancel_work(work, true, &flags);
+fast_queue:
+ __kthread_queue_delayed_work(worker, dwork, delay);
+out:
+ spin_unlock_irqrestore(&worker->lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(kthread_mod_delayed_work);
+
+static bool __kthread_cancel_work_sync(struct kthread_work *work, bool is_dwork)
+{
+ struct kthread_worker *worker = work->worker;
+ unsigned long flags;
+ int ret = false;
+
+ if (!worker)
+ goto out;
+
+ spin_lock_irqsave(&worker->lock, flags);
+ /* Work must not be used with >1 worker, see kthread_queue_work(). */
+ WARN_ON_ONCE(work->worker != worker);
+
+ ret = __kthread_cancel_work(work, is_dwork, &flags);
+
+ if (worker->current_work != work)
+ goto out_fast;
+
+ /*
+ * The work is in progress and we need to wait with the lock released.
+ * In the meantime, block any queuing by setting the canceling counter.
+ */
+ work->canceling++;
+ spin_unlock_irqrestore(&worker->lock, flags);
+ kthread_flush_work(work);
+ spin_lock_irqsave(&worker->lock, flags);
+ work->canceling--;
+
+out_fast:
+ spin_unlock_irqrestore(&worker->lock, flags);
+out:
+ return ret;
+}
+
+/**
+ * kthread_cancel_work_sync - cancel a kthread work and wait for it to finish
+ * @work: the kthread work to cancel
+ *
+ * Cancel @work and wait for its execution to finish. This function
+ * can be used even if the work re-queues itself. On return from this
+ * function, @work is guaranteed to be not pending or executing on any CPU.
+ *
+ * kthread_cancel_work_sync(&delayed_work->work) must not be used for
+ * delayed_work's. Use kthread_cancel_delayed_work_sync() instead.
+ *
+ * The caller must ensure that the worker on which @work was last
+ * queued can't be destroyed before this function returns.
+ *
+ * Return: %true if @work was pending, %false otherwise.
+ */
+bool kthread_cancel_work_sync(struct kthread_work *work)
+{
+ return __kthread_cancel_work_sync(work, false);
+}
+EXPORT_SYMBOL_GPL(kthread_cancel_work_sync);
+
+/**
+ * kthread_cancel_delayed_work_sync - cancel a kthread delayed work and
+ * wait for it to finish.
+ * @dwork: the kthread delayed work to cancel
+ *
+ * This is kthread_cancel_work_sync() for delayed works.
+ *
+ * Return: %true if @dwork was pending, %false otherwise.
+ */
+bool kthread_cancel_delayed_work_sync(struct kthread_delayed_work *dwork)
+{
+ return __kthread_cancel_work_sync(&dwork->work, true);
+}
+EXPORT_SYMBOL_GPL(kthread_cancel_delayed_work_sync);