netdev - [PATCH net-next 4/5] net/sched: sch_htb: warn about class in use while deleting

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Date: Fri, 21 Jul 2023 16:13:31 -0300
From: Pedro Tammela <pctammela@...atatu.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	jhs@...atatu.com,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us,
	Pedro Tammela <pctammela@...atatu.com>
Subject: [PATCH net-next 4/5] net/sched: sch_htb: warn about class in use while deleting

Add extack to warn that delete was rejected because
the class is still in use

Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
---
 net/sched/sch_htb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 5223b63cec00..8e8660a145c3 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1710,8 +1710,10 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg,
 	 * tc subsys guarantee us that in htb_destroy it holds no class
 	 * refs so that we can remove children safely there ?
 	 */
-	if (cl->children || qdisc_class_in_use(&cl->common))
+	if (cl->children || qdisc_class_in_use(&cl->common)) {
+		NL_SET_ERR_MSG(extack, "HTB class in use");
 		return -EBUSY;
+	}
 
 	if (!cl->level && htb_parent_last_child(cl))
 		last_child = 1;
-- 
2.39.2