[PATCH RESEND net-next v4 4/4] net: bonding: add the READ_ONCE/WRITE_ONCE for outside lock accessing
From: Tonghao Zhang <hidden>
Date: 2026-01-12 02:43:18
Subsystem:
bonding driver, networking drivers, the rest · Maintainers:
Jay Vosburgh, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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@jvosburgh.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Cc: Simon Horman <horms@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Andrew Lunn <andrew+netdev@lunn.ch> Cc: Nikolay Aleksandrov <razor@blackwall.org> Cc: Hangbin Liu <redacted> Cc: Jason Xing <redacted> Signed-off-by: Tonghao Zhang <redacted> Reviewed-by: Hangbin Liu <redacted> --- v3/4: - no change 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 b835f63d2871..909c01f55744 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