[PATCH v2 net-next 4/4] fou: Do WARN_ON_ONCE in gue_gro_receive for bad proto callbacks

[Tom Herbert <tom@herbertland.com>]

Do WARN_ON_ONCE instead of WARN_ON in gue_gro_receive when the offload
callcaks are bad (either don't exist or gro_receive is not specified).

Signed-off-by: Tom Herbert <tom@herbertland.com>
---
 net/ipv4/fou.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index eb11f95..2d1646c 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -347,7 +347,7 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head,
 	rcu_read_lock();
 	offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
 	ops = rcu_dereference(offloads[guehdr->proto_ctype]);
-	if (WARN_ON(!ops || !ops->callbacks.gro_receive))
+	if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive))
 		goto out_unlock;
 
 	pp = ops->callbacks.gro_receive(head, skb);
-- 
1.8.5.6