netdev - [PATCH 6/6] Acquire correct locks in alb for promisc change

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Message-Id: <11920760543809-git-send-email-fubar@us.ibm.com>
Date:	Wed, 10 Oct 2007 21:14:09 -0700
From:	Jay Vosburgh <fubar@...ibm.com>
To:	netdev@...r.kernel.org, jgarzik@...ox.com
Cc:	andy@...yhouse.net, Jay Vosburgh <fubar@...ibm.com>
Subject: [PATCH 6/6] Acquire correct locks in alb for promisc change

	Update ALB mode monitor to hold correct locks (RTNL and nothing
else) when calling dev_set_promiscuity.

Signed-off-by: Andy Gospodarek <andy@...yhouse.net>
Signed-off-by: Jay Vosburgh <fubar@...ibm.com>
---
 drivers/net/bonding/bond_alb.c |   19 ++++++++++---------
 1 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 6db5d76..25b8dbf 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -1455,16 +1455,16 @@ void bond_alb_monitor(struct work_struct *work)
 
 	/* handle rlb stuff */
 	if (bond_info->rlb_enabled) {
-		/* the following code changes the promiscuity of the
-		 * the curr_active_slave. It needs to be locked with a
-		 * write lock to protect from other code that also
-		 * sets the promiscuity.
-		 */
-		write_lock_bh(&bond->curr_slave_lock);
-
 		if (bond_info->primary_is_promisc &&
 		    (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
 
+			/*
+			 * dev_set_promiscuity requires rtnl and
+			 * nothing else.
+			 */
+			read_unlock(&bond->lock);
+			rtnl_lock();
+
 			bond_info->rlb_promisc_timeout_counter = 0;
 
 			/* If the primary was set to promiscuous mode
@@ -1473,9 +1473,10 @@ void bond_alb_monitor(struct work_struct *work)
 			 */
 			dev_set_promiscuity(bond->curr_active_slave->dev, -1);
 			bond_info->primary_is_promisc = 0;
-		}
 
-		write_unlock_bh(&bond->curr_slave_lock);
+			rtnl_unlock();
+			read_lock(&bond->lock);
+		}
 
 		if (bond_info->rlb_rebalance) {
 			bond_info->rlb_rebalance = 0;
-- 
1.5.3.1

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