netdev - Re: [PATCH 1/1] bonding: properly unset current_arp

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Date:	Thu, 05 Apr 2012 09:43:22 -0700
From:	Jay Vosburgh <fubar@...ibm.com>
To:	Veaceslav Falico <vfalico@...hat.com>
cc:	netdev@...r.kernel.org, Andy Gospodarek <andy@...yhouse.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] bonding: properly unset current_arp_slave on slave link up

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

>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>

>---
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 0c76186..ad731a1 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -3001,7 +3001,11 @@ 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);
>

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