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net/sched: qdisc_qstats_qlen_backlog() runs locklessly

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qdisc_qstats_qlen_backlog() can be called without qdisc spinlock being held.

Use qdisc_qlen_lockless() instead of qdisc_qlen().

Add a const qualifier to its first parameter (struct Qdisc *sch).

Fixes: edb09eb17e ("net: sched: do not acquire qdisc spinlock in qdisc/class stats dump")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://patch.msgid.link/20260513080853.1383975-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-05-13 08:08:51 +00:00 committed by Jakub Kicinski
parent f65d40643e
commit 72a1795999
1 changed files with 3 additions and 3 deletions
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6
include/net/sch_generic.h
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@ -1070,13 +1070,13 @@ static inline int qdisc_qstats_copy(struct gnet_dump *d, const struct Qdisc *sch
return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
}
static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
__u32 *backlog)
static inline void qdisc_qstats_qlen_backlog(const struct Qdisc *sch,
u32 *qlen, u32 *backlog)
{
struct gnet_stats_queue qstats = { 0 };
gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats);
*qlen = qstats.qlen + qdisc_qlen(sch);
*qlen = qstats.qlen + qdisc_qlen_lockless(sch);
*backlog = qstats.backlog;
}