openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

net-sched: sch_htb: move hash and sibling list removal to htb_delete 

Hash list removal currently happens twice (once in htb_delete, once
in htb_destroy_class), which makes it harder to use the dynamically
sized class hash without adding special cases for HTB. The reason is
that qdisc destruction destroys classes in hierarchical order, which
is not necessary if filters are destroyed in a separate iteration
during qdisc destruction.

Adjust qdisc destruction to follow the same scheme as other hierarchical
qdiscs by first performing a filter destruction pass, then destroying
all classes in hash order.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-07-05 23:22:19 -07:00 committed by David S. Miller
parent d77fea2eb9
commit fbd8f1379a
1 changed files with 17 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
net/sched/sch_htb.c
View File

@ -1226,8 +1226,6 @@ static void htb_parent_to_leaf(struct htb_sched *q, struct htb_class *cl,
static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl)
{
struct htb_sched *q = qdisc_priv(sch);
if (!cl->level) {
BUG_TRAP(cl->un.leaf.q);
qdisc_destroy(cl->un.leaf.q);
@ -1237,21 +1235,6 @@ static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl)
qdisc_put_rtab(cl->ceil);
tcf_destroy_chain(&cl->filter_list);
while (!list_empty(&cl->children))
htb_destroy_class(sch, list_entry(cl->children.next,
struct htb_class, sibling));
/* note: this delete may happen twice (see htb_delete) */
hlist_del_init(&cl->hlist);
list_del(&cl->sibling);
if (cl->prio_activity)
htb_deactivate(q, cl);
if (cl->cmode != HTB_CAN_SEND)
htb_safe_rb_erase(&cl->pq_node, q->wait_pq + cl->level);
kfree(cl);
}
@ -1259,6 +1242,9 @@ static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl)
static void htb_destroy(struct Qdisc *sch)
{
struct htb_sched *q = qdisc_priv(sch);
struct hlist_node *n, *next;
struct htb_class *cl;
unsigned int i;
qdisc_watchdog_cancel(&q->watchdog);
/* This line used to be after htb_destroy_class call below
@ -1267,10 +1253,14 @@ static void htb_destroy(struct Qdisc *sch)
unbind_filter on it (without Oops). */
tcf_destroy_chain(&q->filter_list);
while (!list_empty(&q->root))
htb_destroy_class(sch, list_entry(q->root.next,
struct htb_class, sibling));
for (i = 0; i < HTB_HSIZE; i++) {
hlist_for_each_entry(cl, n, q->hash + i, hlist)
tcf_destroy_chain(&cl->filter_list);
}
for (i = 0; i < HTB_HSIZE; i++) {
hlist_for_each_entry_safe(cl, n, next, q->hash + i, hlist)
htb_destroy_class(sch, cl);
}
__skb_queue_purge(&q->direct_queue);
}
@ -1302,12 +1292,16 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)
qdisc_tree_decrease_qlen(cl->un.leaf.q, qlen);
}
/* delete from hash and active; remainder in destroy_class */
hlist_del_init(&cl->hlist);
/* delete from hash, sibling list and active */
hlist_del(&cl->hlist);
list_del(&cl->sibling);
if (cl->prio_activity)
htb_deactivate(q, cl);
if (cl->cmode != HTB_CAN_SEND)
htb_safe_rb_erase(&cl->pq_node, q->wait_pq + cl->level);
if (last_child)
htb_parent_to_leaf(q, cl, new_q);