Add code to initialize rb tree nodes, and check for double deletion.
This is not a real fix, but I can make it trap sometimes and may
be a bandaid for: http://bugzilla.kernel.org/show_bug.cgi?id=6681
Signed-off-by: Stephen Hemminger <[EMAIL PROTECTED]>
---
net/sched/sch_htb.c | 34 +++++++++++++++++++++++++++-------
1 files changed, 27 insertions(+), 7 deletions(-)
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 7853c6f..3f3e9df 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -366,7 +366,7 @@ static void htb_add_to_wait_tree(struct
* When we are past last key we return NULL.
* Average complexity is 2 steps per call.
*/
-static void htb_next_rb_node(struct rb_node **n)
+static inline void htb_next_rb_node(struct rb_node **n)
{
*n = rb_next(*n);
}
@@ -388,6 +388,18 @@ static inline void htb_add_class_to_row(
}
}
+/* If this triggers, it is a bug in this code, but it need not be fatal */
+static void htb_safe_rb_erase(struct rb_node *rb, struct rb_root *root)
+{
+ if (RB_EMPTY_NODE(rb)) {
+ WARN_ON(1);
+ } else {
+ rb_erase(rb, root);
+ RB_CLEAR_NODE(rb);
+ }
+}
+
+
/**
* htb_remove_class_from_row - removes class from its row
*
@@ -401,10 +413,12 @@ static inline void htb_remove_class_from
while (mask) {
int prio = ffz(~mask);
+
mask &= ~(1 << prio);
if (q->ptr[cl->level][prio] == cl->node + prio)
htb_next_rb_node(q->ptr[cl->level] + prio);
- rb_erase(cl->node + prio, q->row[cl->level] + prio);
+
+ htb_safe_rb_erase(cl->node + prio, q->row[cl->level] + prio);
if (!q->row[cl->level][prio].rb_node)
m |= 1 << prio;
}
@@ -472,7 +486,7 @@ static void htb_deactivate_prios(struct
p->un.inner.ptr[prio] = NULL;
}
- rb_erase(cl->node + prio, p->un.inner.feed + prio);
+ htb_safe_rb_erase(cl->node + prio, p->un.inner.feed +
prio);
if (!p->un.inner.feed[prio].rb_node)
mask |= 1 << prio;
@@ -739,7 +753,7 @@ #define HTB_ACCNT(T,B,R) toks = diff + c
htb_change_class_mode(q, cl, &diff);
if (old_mode != cl->cmode) {
if (old_mode != HTB_CAN_SEND)
- rb_erase(&cl->pq_node, q->wait_pq + cl->level);
+ htb_safe_rb_erase(&cl->pq_node, q->wait_pq +
cl->level);
if (cl->cmode != HTB_CAN_SEND)
htb_add_to_wait_tree(q, cl, diff);
}
@@ -782,7 +796,7 @@ static long htb_do_events(struct htb_sch
if (time_after(cl->pq_key, q->jiffies)) {
return cl->pq_key - q->jiffies;
}
- rb_erase(p, q->wait_pq + level);
+ htb_safe_rb_erase(p, q->wait_pq + level);
diff = PSCHED_TDIFF_SAFE(q->now, cl->t_c, (u32) cl->mbuffer);
htb_change_class_mode(q, cl, &diff);
if (cl->cmode != HTB_CAN_SEND)
@@ -1279,7 +1293,7 @@ static void htb_destroy_class(struct Qdi
htb_deactivate(q, cl);
if (cl->cmode != HTB_CAN_SEND)
- rb_erase(&cl->pq_node, q->wait_pq + cl->level);
+ htb_safe_rb_erase(&cl->pq_node, q->wait_pq + cl->level);
kfree(cl);
}
@@ -1370,6 +1384,8 @@ static int htb_change_class(struct Qdisc
if (!cl) { /* new class */
struct Qdisc *new_q;
+ int prio;
+
/* check for valid classid */
if (!classid || TC_H_MAJ(classid ^ sch->handle)
|| htb_find(classid, sch))
@@ -1389,6 +1405,10 @@ static int htb_change_class(struct Qdisc
INIT_HLIST_NODE(&cl->hlist);
INIT_LIST_HEAD(&cl->children);
INIT_LIST_HEAD(&cl->un.leaf.drop_list);
+ RB_CLEAR_NODE(&cl->pq_node);
+
+ for (prio = 0; prio < TC_HTB_NUMPRIO; prio++)
+ RB_CLEAR_NODE(&cl->node[prio]);
/* create leaf qdisc early because it uses kmalloc(GFP_KERNEL)
so that can't be used inside of sch_tree_lock
@@ -1404,7 +1424,7 @@ static int htb_change_class(struct Qdisc
/* remove from evt list because of level change */
if (parent->cmode != HTB_CAN_SEND) {
- rb_erase(&parent->pq_node, q->wait_pq);
+ htb_safe_rb_erase(&parent->pq_node, q->wait_pq);
parent->cmode = HTB_CAN_SEND;
}
parent->level = (parent->parent ? parent->parent->level
--
1.4.0
-
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