bonding: ARP monitor spams NETDEV_NOTIFY_PEERS notifiers

[ Upstream commit 7a9214f3d88cfdb099f3896e102a306b316d8707 ]

The bonding ARP monitor fails to decrement send_peer_notif, the
number of peer notifications (gratuitous ARP or ND) to be sent. This
results in a continuous series of notifications.

Correct this by decrementing the counter for each notification.

Reported-by: Jonathan Toppins <jtoppins@redhat.com>
Signed-off-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Fixes: b0929915e035 ("bonding: Fix RTNL: assertion failed at net/core/rtnetlink.c for ab arp monitor")
Link: https://lore.kernel.org/netdev/b2fd4147-8f50-bebd-963a-1a3e8d1d9715@redhat.com/
Tested-by: Jonathan Toppins <jtoppins@redhat.com>
Reviewed-by: Jonathan Toppins <jtoppins@redhat.com>
Link: https://lore.kernel.org/r/9400.1655407960@famine
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 2e75b7e..cd0d7b2 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3474,9 +3474,11 @@ re_arm:
                if (!rtnl_trylock())
                        return;
 
-               if (should_notify_peers)
+               if (should_notify_peers) {
+                       bond->send_peer_notif--;
                        call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
                                                 bond->dev);
+               }
                if (should_notify_rtnl) {
                        bond_slave_state_notify(bond);
                        bond_slave_link_notify(bond);