--- zzzz-none-000/linux-2.6.39.4/net/sched/sch_sfq.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/net/sched/sch_sfq.c	2021-11-10 13:38:18.000000000 +0000
@@ -421,9 +421,10 @@
 	sfq_index a, next_a;
 	struct sfq_slot *slot;
 
-	/* No active slots */
-	if (q->tail == NULL)
-		return NULL;
+   /* No active slots, backport fix JZ-26841 cduerrschmidt */
+   if (q->cur_depth == 0) {
+      return NULL;
+   }
 
 next_slot:
 	a = q->tail->next;