diff mbox series

[net,10/13] net: sched: cls_u32: the tp_c argument of u32_set_parms() is always tp->data

Message ID 20180909013132.3222-11-viro@ZenIV.linux.org.uk
State Changes Requested, archived
Delegated to: David Miller
Headers show
Series cls_u32 cleanups and fixes. | expand

Commit Message

Al Viro Sept. 9, 2018, 1:31 a.m. UTC 
From: Al Viro <viro@zeniv.linux.org.uk>

It must be tc_u_common associated with that tp (i.e. tp->data).
Proof:
	* both ->ht_up and ->tp_c are assign-once
	* ->tp_c of anything inserted into tp_c->hlist is tp_c
	* hnodes never get reinserted into the lists or moved
between those, so anything found by u32_lookup_ht(tp->data, ...)
will have ->tp_c equal to tp->data.
	* tp->root->tp_c == tp->data.
	* ->ht_up of anything inserted into hnode->ht[...] is
equal to hnode.
	* knodes never get reinserted into hash chains or moved
between those, so anything returned by u32_lookup_key(ht, ...)
will have ->ht_up equal to ht.
	* any knode returned by u32_get(tp, ...) will have ->ht_up->tp_c
point to tp->data

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 net/sched/cls_u32.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

Comments

Jamal Hadi Salim Sept. 9, 2018, 12:48 p.m. UTC | #1 
On 2018-09-08 9:31 p.m., Al Viro wrote:
> From: Al Viro <viro@zeniv.linux.org.uk>
> 


Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>

cheers,
jamal
diff mbox series

Patch

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 221ce532b241..12757e3ec8d8 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -956,8 +956,7 @@  static int u32_change(struct net *net, struct sk_buff *in_skb,
 		if (!new)
 			return -ENOMEM;
 
-		err = u32_set_parms(net, tp, base,
-				    rtnl_dereference(n->ht_up)->tp_c, new, tb,
+		err = u32_set_parms(net, tp, base, tp_c, new, tb,
 				    tca[TCA_RATE], ovr, extack);
 
 		if (err) {
@@ -1124,7 +1123,7 @@  static int u32_change(struct net *net, struct sk_buff *in_skb,
 	}
 #endif
 
-	err = u32_set_parms(net, tp, base, ht->tp_c, n, tb, tca[TCA_RATE], ovr,
+	err = u32_set_parms(net, tp, base, tp_c, n, tb, tca[TCA_RATE], ovr,
 			    extack);
 	if (err == 0) {
 		struct tc_u_knode __rcu **ins;