diff --git a/kernel/kthread.c b/kernel/kthread.c
index 5641b55..5373355 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -835,6 +835,7 @@ void kthread_delayed_work_timer_fn(struct timer_list *t)
 	struct kthread_delayed_work *dwork = from_timer(dwork, t, timer);
 	struct kthread_work *work = &dwork->work;
 	struct kthread_worker *worker = work->worker;
+	unsigned long flags;
 
 	/*
 	 * This might happen when a pending work is reinitialized.
@@ -843,7 +844,7 @@ void kthread_delayed_work_timer_fn(struct timer_list *t)
 	if (WARN_ON_ONCE(!worker))
 		return;
 
-	raw_spin_lock(&worker->lock);
+	raw_spin_lock_irqsave(&worker->lock, flags);
 	/* Work must not be used with >1 worker, see kthread_queue_work(). */
 	WARN_ON_ONCE(work->worker != worker);
 
@@ -852,7 +853,7 @@ void kthread_delayed_work_timer_fn(struct timer_list *t)
 	list_del_init(&work->node);
 	kthread_insert_work(worker, work, &worker->work_list);
 
-	raw_spin_unlock(&worker->lock);
+	raw_spin_unlock_irqrestore(&worker->lock, flags);
 }
 EXPORT_SYMBOL(kthread_delayed_work_timer_fn);