diff --git a/drivers/char/drm/drm_irq.c b/drivers/char/drm/drm_irq.c
index 2b10e5b..b08608a 100644
--- a/drivers/char/drm/drm_irq.c
+++ b/drivers/char/drm/drm_irq.c
@@ -119,7 +119,6 @@
 		init_waitqueue_head(&dev->vbl_queue);
 
 		spin_lock_init(&dev->vbl_lock);
-		spin_lock_init(&dev->tasklet_lock);
 
 		INIT_LIST_HEAD(&dev->vbl_sigs.head);
 		INIT_LIST_HEAD(&dev->vbl_sigs2.head);
@@ -456,7 +455,8 @@
 	unsigned long irqflags;
 	static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
 
-	if (test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
+	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) ||
+	    test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
 		return;
 
 	spin_lock_irqsave(&dev->tasklet_lock, irqflags);
diff --git a/drivers/char/drm/drm_stub.c b/drivers/char/drm/drm_stub.c
index 6f748e1..5fd6dc0 100644
--- a/drivers/char/drm/drm_stub.c
+++ b/drivers/char/drm/drm_stub.c
@@ -61,6 +61,7 @@
 
 	spin_lock_init(&dev->count_lock);
 	spin_lock_init(&dev->drw_lock);
+	spin_lock_init(&dev->tasklet_lock);
 	init_timer(&dev->timer);
 	mutex_init(&dev->struct_mutex);
 	mutex_init(&dev->ctxlist_mutex);