Subject: [PATCH net-next v3 3/3] net: rps: locklessly access rflow->cpu

From: Jason Xing <[email-masked]>
Date: Thu, 18 Apr 2024 15:36:03 +0800

From: Jason Xing <[email-masked]>

This is the last member in struct rps_dev_flow which should be
protected locklessly. So finish it.

Signed-off-by: Jason Xing <[email-masked]>
---
 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 ed6efef01582..8010036c07b6 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4533,7 +4533,7 @@ set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
 		rps_input_queue_tail_save(&rflow->last_qtail, head);
 	}
 
-	rflow->cpu = next_cpu;
+	WRITE_ONCE(rflow->cpu, next_cpu);
 	return rflow;
 }
 
-- 
2.37.3