netdev - Re: [PATCH net] bonding: force carrier update when releasing slave

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Date:   Thu, 17 Feb 2022 10:40:26 -0800
From:   Jay Vosburgh <jay.vosburgh@...onical.com>
To:     Zhang Changzhong <zhangchangzhong@...wei.com>
cc:     Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jeff Garzik <jeff@...zik.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] bonding: force carrier update when releasing slave

Zhang Changzhong <zhangchangzhong@...wei.com> wrote:

>In __bond_release_one(), bond_set_carrier() is only called when bond
>device has no slave. Therefore, if we remove the up slave from a master
>with two slaves and keep the down slave, the master will remain up.
>
>Fix this by moving bond_set_carrier() out of if (!bond_has_slaves(bond))
>statement.
>
>Reproducer:
>$ insmod bonding.ko mode=0 miimon=100 max_bonds=2
>$ ifconfig bond0 up
>$ ifenslave bond0 eth0 eth1
>$ ifconfig eth0 down
>$ ifenslave -d bond0 eth1
>$ cat /proc/net/bonding/bond0
>
>Fixes: ff59c4563a8d ("[PATCH] bonding: support carrier state for master")
>Signed-off-by: Zhang Changzhong <zhangchangzhong@...wei.com>

Acked-by: Jay Vosburgh <jay.vosburgh@...onical.com>


>---
> drivers/net/bonding/bond_main.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 238b56d..aebeb46 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -2379,10 +2379,9 @@ static int __bond_release_one(struct net_device *bond_dev,
> 		bond_select_active_slave(bond);
> 	}
> 
>-	if (!bond_has_slaves(bond)) {
>-		bond_set_carrier(bond);
>+	bond_set_carrier(bond);
>+	if (!bond_has_slaves(bond))
> 		eth_hw_addr_random(bond_dev);
>-	}
> 
> 	unblock_netpoll_tx();
> 	synchronize_rcu();
>-- 
>2.9.5
>