netdev - [PATCH net-next v2 4/5] net: bonding: add the READ_ONCE/WRITE

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Message-Id: <20251126023829.44946-5-tonghao@bamaicloud.com>
Date: Wed, 26 Nov 2025 10:38:28 +0800
From: Tonghao Zhang <tonghao@...aicloud.com>
To: netdev@...r.kernel.org
Cc: Tonghao Zhang <tonghao@...aicloud.com>,
	Jay Vosburgh <jv@...sburgh.net>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Hangbin Liu <liuhangbin@...il.com>,
	Jason Xing <kerneljasonxing@...il.com>
Subject: [PATCH net-next v2 4/5] net: bonding: add the READ_ONCE/WRITE_ONCE for outside lock accessing

Although operations on the variable send_peer_notif are already within
a lock-protected critical section, there are cases where it is accessed
outside the lock. Therefore, READ_ONCE() and WRITE_ONCE() should be
added to it.

Cc: Jay Vosburgh <jv@...sburgh.net>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>
Cc: Jonathan Corbet <corbet@....net>
Cc: Andrew Lunn <andrew+netdev@...n.ch>
Cc: Nikolay Aleksandrov <razor@...ckwall.org>
Cc: Hangbin Liu <liuhangbin@...il.com>
Cc: Jason Xing <kerneljasonxing@...il.com>
Signed-off-by: Tonghao Zhang <tonghao@...aicloud.com>
---
v2: fix compilation errors
---
 drivers/net/bonding/bond_main.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 025ca0a45615..14396e39b1f0 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1204,8 +1204,9 @@ void bond_peer_notify_work_rearm(struct bonding *bond, unsigned long delay)
 /* Peer notify update handler. Holds only RTNL */
 static void bond_peer_notify_reset(struct bonding *bond)
 {
-	bond->send_peer_notif = bond->params.num_peer_notif *
-		max(1, bond->params.peer_notif_delay);
+	WRITE_ONCE(bond->send_peer_notif,
+		   bond->params.num_peer_notif *
+		   max(1, bond->params.peer_notif_delay));
 }
 
 static void bond_peer_notify_handler(struct work_struct *work)
@@ -2825,7 +2826,7 @@ static void bond_mii_monitor(struct work_struct *work)
 
 	rcu_read_unlock();
 
-	if (commit || bond->send_peer_notif) {
+	if (commit || READ_ONCE(bond->send_peer_notif)) {
 		/* Race avoidance with bond_close cancel of workqueue */
 		if (!rtnl_trylock()) {
 			delay = 1;
@@ -3784,7 +3785,7 @@ static void bond_activebackup_arp_mon(struct bonding *bond)
 	should_notify_rtnl = bond_ab_arp_probe(bond);
 	rcu_read_unlock();
 
-	if (bond->send_peer_notif || should_notify_rtnl) {
+	if (READ_ONCE(bond->send_peer_notif) || should_notify_rtnl) {
 		if (!rtnl_trylock()) {
 			delta_in_ticks = 1;
 			goto re_arm;
-- 
2.34.1