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sch_htb: make htb_qlen_notify() idempotent

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commit 5ba8b837b5 upstream.

htb_qlen_notify() always deactivates the HTB class and in fact could
trigger a warning if it is already deactivated. Therefore, it is not
idempotent and not friendly to its callers, like fq_codel_dequeue().

Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers'
life.

Reported-by: Gerrard Tai <gerrard.tai@starlabs.sg>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250403211033.166059-2-xiyou.wangcong@gmail.com
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Cong Wang 2025-04-03 14:10:23 -07:00 committed by Greg Kroah-Hartman
parent 587558d812
commit 967955c9e5
1 changed files with 2 additions and 0 deletions
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2
net/sched/sch_htb.c
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@ -1506,6 +1506,8 @@ static void htb_qlen_notify(struct Qdisc *sch, unsigned long arg)
{ {
struct htb_class *cl = (struct htb_class *)arg; struct htb_class *cl = (struct htb_class *)arg;
if (!cl->prio_activity)
return;
htb_deactivate(qdisc_priv(sch), cl); htb_deactivate(qdisc_priv(sch), cl);
} }