sch_htb: remove from event queue in htb_parent_to_leaf()

There is lack of removing a class from the event queue while changing
from parent to leaf which can cause corruption of this rb tree. This
patch fixes a bug introduced by my patch: "sch_htb: turn intermediate
classes into leaves" commit: 160d5e10f87b1dc88fd9b84b31b1718e0fd76398.

Many thanks to Jan 'yanek' Bortl for finding a way to reproduce this
rare bug and narrowing the test case, which made possible proper
diagnosing.

This patch is recommended for all kernels starting from 2.6.20.

Reported-and-tested-by: Jan 'yanek' Bortl <yanek@ya.bofh.cz>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 2 deletions

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 66148cc4759e..5bc1ed490180 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1197,12 +1197,16 @@ static inline int htb_parent_last_child(struct htb_class *cl)
         return 1;
 }
 
-static void htb_parent_to_leaf(struct htb_class *cl, struct Qdisc *new_q)
+static void htb_parent_to_leaf(struct htb_sched *q, struct htb_class *cl,
+                               struct Qdisc *new_q)
 {
         struct htb_class *parent = cl->parent;
 
         BUG_TRAP(!cl->level && cl->un.leaf.q && !cl->prio_activity);
 
+        if (parent->cmode != HTB_CAN_SEND)
+                htb_safe_rb_erase(&parent->pq_node, q->wait_pq + parent->level);
+
         parent->level = 0;
         memset(&parent->un.inner, 0, sizeof(parent->un.inner));
         INIT_LIST_HEAD(&parent->un.leaf.drop_list);
@@ -1300,7 +1304,7 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)
                 htb_deactivate(q, cl);
 
         if (last_child)
-                htb_parent_to_leaf(cl, new_q);
+                htb_parent_to_leaf(q, cl, new_q);
 
         if (--cl->refcnt == 0)
                 htb_destroy_class(sch, cl);