netdev - [PATCH v4 net-next 03/13] dev: annotate accesses to dev->link

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Date: Tue, 13 Feb 2024 06:32:35 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v4 net-next 03/13] dev: annotate accesses to dev->link

Following patch will read dev->link locklessly,
annotate the write from do_setlink().

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/core/rtnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 31f433950c8dc953bcb65cc0469f7df962314b87..8d95e0863534f80cecceb2dd4a7b2a16f7f4bca3 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2974,7 +2974,7 @@ static int do_setlink(const struct sk_buff *skb,
 		write_lock(&dev_base_lock);
 		if (dev->link_mode ^ value)
 			status |= DO_SETLINK_NOTIFY;
-		dev->link_mode = value;
+		WRITE_ONCE(dev->link_mode, value);
 		write_unlock(&dev_base_lock);
 	}
 
-- 
2.43.0.687.g38aa6559b0-goog