From: Xiangning Yu <yuxiangning@gmail.com>
Date: Thu, 7 Jun 2018 13:39:59 +0800
Subject: bonding: re-evaluate force_primary when the primary slave name
 changes
Git-commit: eb55bbf865d9979098c6a7a17cbdb41237ece951
Patch-mainline: v4.18-rc1
References: networking-stable-18_06_20

There is a timing issue under active-standy mode, when bond_enslave() is
called, bond->params.primary might not be initialized yet.

Any time the primary slave string changes, bond->force_primary should be
set to true to make sure the primary becomes the active slave.

Signed-off-by: Xiangning Yu <yuxiangning@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/net/bonding/bond_options.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -1119,6 +1119,7 @@ static int bond_option_primary_set(struc
 				    slave->dev->name);
 			rcu_assign_pointer(bond->primary_slave, slave);
 			strcpy(bond->params.primary, slave->dev->name);
+			bond->force_primary = true;
 			bond_select_active_slave(bond);
 			goto out;
 		}