diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c
index a7d83eec3d155..98f4056f89ffe 100644
--- a/drivers/thunderbolt/domain.c
+++ b/drivers/thunderbolt/domain.c
@@ -493,6 +493,7 @@ int tb_domain_add(struct tb *tb)
 	device_del(&tb->dev);
 err_ctl_stop:
 	tb_ctl_stop(tb->ctl);
+	mutex_unlock(&tb->lock);
 
 	return ret;
 }