4 files changed, 20 insertions, 8 deletions

diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 9e43ed949167..d728d8111732 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1960,8 +1960,11 @@ static int cbq_delete(struct Qdisc *sch, unsigned long arg)
         cbq_rmprio(q, cl);
         sch_tree_unlock(sch);
 
-        if (--cl->refcnt == 0)
-                cbq_destroy_class(sch, cl);
+        BUG_ON(--cl->refcnt == 0);
+        /*
+         * This shouldn't happen: we "hold" one cops->get() when called
+         * from tc_ctl_tclass; the destroy method is done from cops->put().
+         */
 
         return 0;
 }
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index e36e94ab4e10..7597fe146866 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -155,8 +155,11 @@ static int drr_delete_class(struct Qdisc *sch, unsigned long arg)
         drr_purge_queue(cl);
         qdisc_class_hash_remove(&q->clhash, &cl->common);
 
-        if (--cl->refcnt == 0)
-                drr_destroy_class(sch, cl);
+        BUG_ON(--cl->refcnt == 0);
+        /*
+         * This shouldn't happen: we "hold" one cops->get() when called
+         * from tc_ctl_tclass; the destroy method is done from cops->put().
+         */
 
         sch_tree_unlock(sch);
         return 0;
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 74226b265528..5022f9c1f34b 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1139,8 +1139,11 @@ hfsc_delete_class(struct Qdisc *sch, unsigned long arg)
         hfsc_purge_queue(sch, cl);
         qdisc_class_hash_remove(&q->clhash, &cl->cl_common);
 
-        if (--cl->refcnt == 0)
-                hfsc_destroy_class(sch, cl);
+        BUG_ON(--cl->refcnt == 0);
+        /*
+         * This shouldn't happen: we "hold" one cops->get() when called
+         * from tc_ctl_tclass; the destroy method is done from cops->put().
+         */
 
         sch_tree_unlock(sch);
         return 0;
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 355974f610c5..88cd02626621 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1275,8 +1275,11 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)
         if (last_child)
                 htb_parent_to_leaf(q, cl, new_q);
 
-        if (--cl->refcnt == 0)
-                htb_destroy_class(sch, cl);
+        BUG_ON(--cl->refcnt == 0);
+        /*
+         * This shouldn't happen: we "hold" one cops->get() when called
+         * from tc_ctl_tclass; the destroy method is done from cops->put().
+         */
 
         sch_tree_unlock(sch);
         return 0;