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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jay Vosburgh <jay.vosburgh@canonical.com>,
        Mahesh Bandewar <maheshb@google.com>,
        Jakub Kicinski <jakub.kicinski@netronome.com>
Subject: [PATCH 5.4 179/191] bonding: fix active-backup transition after link failure
Date:   Thu,  2 Jan 2020 23:07:41 +0100
Message-Id: <20200102215848.449636427@linuxfoundation.org>
In-Reply-To: <20200102215829.911231638@linuxfoundation.org>
References: <20200102215829.911231638@linuxfoundation.org>
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From: Mahesh Bandewar <maheshb@google.com>

[ Upstream commit 5d485ed88d48f8101a2067348e267c0aaf4ed486 ]

After the recent fix in commit 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@canonical.com>
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/bonding/bond_main.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2225,9 +2225,6 @@ static void bond_miimon_commit(struct bo
 			} 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",