linux-kernel - [ 068/167] [PATCH 08/26] bonding: properly unset current_arp

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Message-Id: <20120509055039.267551992@decadent.org.uk>
Date:	Wed, 09 May 2012 06:51:37 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Veaceslav Falico <vfalico@...hat.com>,
	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Marcelo Ricardo Leitner <mleitner@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 068/167] [PATCH 08/26] bonding: properly unset current_arp_slave on slave
 link up

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

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

From: Veaceslav Falico <vfalico@...hat.com>

[ Upstream commit 5a4309746cd74734daa964acb02690c22b3c8911 ]

When a slave comes up, we're unsetting the current_arp_slave without
removing active flags from it, which can lead to situations where we have
more than one slave with active flags in active-backup mode.

To avoid this situation we must remove the active flags from a slave before
removing it as a current_arp_slave.

Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
Signed-off-by: Jay Vosburgh <fubar@...ibm.com>
Signed-off-by: Andy Gospodarek <andy@...yhouse.net>
Signed-off-by: Marcelo Ricardo Leitner <mleitner@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/bonding/bond_main.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index e58aa2b..f65e0b9 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2982,7 +2982,11 @@ static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
 					   trans_start + delta_in_ticks)) ||
 			    bond->curr_active_slave != slave) {
 				slave->link = BOND_LINK_UP;
-				bond->current_arp_slave = NULL;
+				if (bond->current_arp_slave) {
+					bond_set_slave_inactive_flags(
+						bond->current_arp_slave);
+					bond->current_arp_slave = NULL;
+				}
 
 				pr_info("%s: link status definitely up for interface %s.\n",
 					bond->dev->name, slave->dev->name);
-- 
1.7.10



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