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net: annotate a data-race in __dev_xmit_skb()

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q->limit is read locklessly, add a READ_ONCE().

Fixes: 100dfa74ca ("net: dev_queue_xmit() llist adoption")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251121083256.674562-12-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2025-11-21 08:32:53 +00:00 committed by Paolo Abeni
parent b2e9821cff
commit 4792c3a4c1
1 changed files with 1 additions and 1 deletions
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2
net/core/dev.c
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@ -4194,7 +4194,7 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
do {
if (first_n && !defer_count) {
defer_count = atomic_long_inc_return(&q->defer_count);
if (unlikely(defer_count > q->limit)) {
if (unlikely(defer_count > READ_ONCE(q->limit))) {
kfree_skb_reason(skb, SKB_DROP_REASON_QDISC_DROP);
return NET_XMIT_DROP;
}