linux-kernel - [PATCH 4.9 15/39] bonding: re-evaluate force_primary when the primary slave name changes

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Message-Id: <20180624152353.723760122@linuxfoundation.org>
Date:   Sun, 24 Jun 2018 23:24:02 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xiangning Yu <yuxiangning@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 15/39] bonding: re-evaluate force_primary when the primary slave name changes

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Xiangning Yu <yuxiangning@...il.com>

[ Upstream commit eb55bbf865d9979098c6a7a17cbdb41237ece951 ]

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@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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
@@ -1114,6 +1114,7 @@ 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;
 		}