diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 47e61956168d..32e418dba133 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -149,8 +149,8 @@ static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) static inline bool qdisc_is_empty(const struct Qdisc *qdisc) { if (qdisc_is_percpu_stats(qdisc)) - return qdisc->empty; - return !qdisc->q.qlen; + return READ_ONCE(qdisc->empty); + return !READ_ONCE(qdisc->q.qlen); } static inline bool qdisc_run_begin(struct Qdisc *qdisc) @@ -158,7 +158,7 @@ static inline bool qdisc_run_begin(struct Qdisc *qdisc) if (qdisc->flags & TCQ_F_NOLOCK) { if (!spin_trylock(&qdisc->seqlock)) return false; - qdisc->empty = false; + WRITE_ONCE(qdisc->empty, false); } else if (qdisc_is_running(qdisc)) { return false; } diff --git a/net/core/dev.c b/net/core/dev.c index 046307445ece..3e11c6bb4dd6 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3386,7 +3386,7 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, qdisc_calculate_pkt_len(skb, q); if (q->flags & TCQ_F_NOLOCK) { - if ((q->flags & TCQ_F_CAN_BYPASS) && q->empty && + if ((q->flags & TCQ_F_CAN_BYPASS) && READ_ONCE(q->empty) && qdisc_run_begin(q)) { if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 8769b4b8807d..7c3c5fdb82a9 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -657,7 +657,7 @@ static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) if (likely(skb)) { qdisc_update_stats_at_dequeue(qdisc, skb); } else { - qdisc->empty = true; + WRITE_ONCE(qdisc->empty, true); } return skb;