netdev - [PATCH net-next] net: make sure net_rx_action() calls skb_defer_free

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Date:   Wed, 27 Apr 2022 13:41:47 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next] net: make sure net_rx_action() calls skb_defer_free_flush()

From: Eric Dumazet <edumazet@...gle.com>

I missed a stray return; in net_rx_action(), which very well
is taken whenever trigger_rx_softirq() has been called on
a cpu that is no longer receiving network packets,
or receiving too few of them.

Fixes: 68822bdf76f1 ("net: generalize skb freeing deferral to per-cpu lists")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Ido Schimmel <idosch@...dia.com>
---
 net/core/dev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 611bd719706412723561c27753150b27e1dc4e7a..e09cd202fc579dfe2313243e20def8044aafafa2 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6617,7 +6617,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h)
 
 		if (list_empty(&list)) {
 			if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll))
-				return;
+				goto end;
 			break;
 		}
 
@@ -6644,6 +6644,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h)
 		__raise_softirq_irqoff(NET_RX_SOFTIRQ);
 
 	net_rps_action_and_irq_enable(sd);
+end:
 	skb_defer_free_flush(sd);
 }
 
-- 
2.36.0.rc2.479.g8af0fa9b8e-goog