diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index f78a2ea..4bed10e 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -838,7 +838,6 @@ static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 				struct sk_buff **to_free)
 {
-	qdisc_calculate_pkt_len(skb, sch);
 	return sch->enqueue(skb, sch, to_free);
 }
 
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index b8eecd6..eff018a 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -590,7 +590,6 @@ void __qdisc_calculate_pkt_len(struct sk_buff *skb,
 		pkt_len = 1;
 	qdisc_skb_cb(skb)->pkt_len = pkt_len;
 }
-EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
 
 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
 {
@@ -1120,6 +1119,12 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
 			return -EINVAL;
 		}
 
+		if (new &&
+		    !(parent->flags & TCQ_F_MQROOT) &&
+		    rcu_access_pointer(new->stab)) {
+			NL_SET_ERR_MSG(extack, "STAB not supported on a non root");
+			return -EINVAL;
+		}
 		err = cops->graft(parent, cl, new, &old, extack);
 		if (err)
 			return err;