--- y/drivers/input/input.c
+++ n/drivers/input/input.c
@@ -781,9 +781,8 @@ static void input_disconnect_device(stru
 	 * not to protect access to dev->going_away but rather to ensure
 	 * that there are no threads in the middle of input_open_device()
 	 */
-	mutex_lock(&dev->mutex);
 	dev->going_away = true;
-	mutex_unlock(&dev->mutex);
+	synchronize_rcu();
 
 	spin_lock_irq(&dev->event_lock);
 
--- a/drivers/input/joydev.c
+++ b/drivers/input/joydev.c
@@ -728,9 +728,8 @@ static const struct file_operations joyd
  */
 static void joydev_mark_dead(struct joydev *joydev)
 {
-	mutex_lock(&joydev->mutex);
 	joydev->exist = false;
-	mutex_unlock(&joydev->mutex);
+	synchronize_rcu();
 }
 
 static void joydev_cleanup(struct joydev *joydev)