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[NET_SCHED]: Fix endless loops (part 3): HFSC 

Convert HFSC to use qdisc_tree_decrease_len() and add a callback
for deactivating a class when its child queue becomes empty.

All queue purging goes through hfsc_purge_queue(), which is used in
three cases: grafting, class creation (when a leaf class is turned
into an intermediate class by attaching a new class) and class
deletion. In all cases qdisc_tree_decrease_len() is needed.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-11-29 17:36:43 -08:00 committed by David S. Miller
parent 5e50da01d0
commit f973b913e1
1 changed files with 13 additions and 5 deletions
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18
net/sched/sch_hfsc.c
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@ -957,11 +957,7 @@ hfsc_purge_queue(struct Qdisc *sch, struct hfsc_class *cl)
unsigned int len = cl->qdisc->q.qlen;
qdisc_reset(cl->qdisc);
if (len > 0) {
update_vf(cl, 0, 0);
set_passive(cl);
sch->q.qlen -= len;
}
qdisc_tree_decrease_qlen(cl->qdisc, len);
}
static void
@ -1295,6 +1291,17 @@ hfsc_class_leaf(struct Qdisc *sch, unsigned long arg)
return NULL;
}
static void
hfsc_qlen_notify(struct Qdisc *sch, unsigned long arg)
{
struct hfsc_class *cl = (struct hfsc_class *)arg;
if (cl->qdisc->q.qlen == 0) {
update_vf(cl, 0, 0);
set_passive(cl);
}
}
static unsigned long
hfsc_get_class(struct Qdisc *sch, u32 classid)
{
@ -1779,6 +1786,7 @@ static struct Qdisc_class_ops hfsc_class_ops = {
.delete = hfsc_delete_class,
.graft = hfsc_graft_class,
.leaf = hfsc_class_leaf,
.qlen_notify = hfsc_qlen_notify,
.get = hfsc_get_class,
.put = hfsc_put_class,
.bind_tcf = hfsc_bind_tcf,