netdev - [PATCH net] bonding: fix active-backup transition after link failure

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Message-Id: <20191206234455.213159-1-maheshb@google.com>
Date:   Fri,  6 Dec 2019 15:44:55 -0800
From:   Mahesh Bandewar <maheshb@...gle.com>
To:     Jay Vosburgh <j.vosburgh@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Veaceslav Falico <vfalico@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     Netdev <netdev@...r.kernel.org>,
        Mahesh Bandewar <mahesh@...dewar.net>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Jay Vosburgh <jay.vosburgh@...onical.com>
Subject: [PATCH net] bonding: fix active-backup transition after link failure

After the recent fix 1899bb325149 ("bonding: fix state transition
issue in link monitoring"), the active-backup mode with miimon
initially come-up fine but after a link-failure, both members
transition into backup state.

Following steps to reproduce the scenario (eth1 and eth2 are the
slaves of the bond):

    ip link set eth1 up
    ip link set eth2 down
    sleep 1
    ip link set eth2 up
    ip link set eth1 down
    cat /sys/class/net/eth1/bonding_slave/state
    cat /sys/class/net/eth2/bonding_slave/state

Fixes: 1899bb325149 ("bonding: fix state transition issue in link monitoring")
CC: Jay Vosburgh <jay.vosburgh@...onical.com>
Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
---
 drivers/net/bonding/bond_main.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index fcb7c2f7f001..ad9906c102b4 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2272,9 +2272,6 @@ static void bond_miimon_commit(struct bonding *bond)
 			} else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
 				/* make it immediately active */
 				bond_set_active_slave(slave);
-			} else if (slave != primary) {
-				/* prevent it from being the active one */
-				bond_set_backup_slave(slave);
 			}
 
 			slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
-- 
2.24.0.393.g34dc348eaf-goog