[PATCH v3 net-next 11/14] net: annotate a data-race in __dev_xmit_skb()

[Eric Dumazet <edumazet@google.com>]

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

Fixes: 100dfa74cad9 ("net: dev_queue_xmit() llist adoption")
Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 53e2496dc4292284072946fd9131d3f9a0c0af44..10042139dbb054b9a93dfb019477a80263feb029 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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;
 			}
-- 
2.52.0.460.gd25c4c69ec-goog