From: Eric Dumazet <edumazet@google.com>
Date: Tue, 13 Feb 2024 06:32:35 +0000 (+0000)
Subject: dev: annotate accesses to dev->link
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a6473fe9b623f6667af72d972b87cd9a5ff87e21;p=linux.git

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@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 6f1c5537e8421..fd47a4422a51d 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2956,7 +2956,7 @@ 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);
 	}