netdev - [PATCH 1/4] bonding: Fix locking in 802.3ad mode

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Message-Id: <1206163777364-git-send-email-fubar@us.ibm.com>
Date:	Fri, 21 Mar 2008 22:29:33 -0700
From:	Jay Vosburgh <fubar@...ibm.com>
To:	netdev@...r.kernel.org
Cc:	Jeff Garzik <jgarzik@...ox.com>, Jay Vosburgh <fubar@...ibm.com>
Subject: [PATCH 1/4] bonding: Fix locking in 802.3ad mode

	The 802.3ad state machine lock can be acquired in both softirq and
not softirq context, but was not held at _bh to prevent a deadlock (which
could occur if a LACPDU arrived and was processed while the lock was
held).

	Corrected this, now hold the state machine lock at _bh to prevent
deadlock.

	Bug reported by Todd Fleisher <todd@...ish.org>.

Signed-off-by: Jay Vosburgh <fubar@...ibm.com>
---
 drivers/net/bonding/bond_3ad.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index cb3c6fa..d16e0e1 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -310,7 +310,7 @@ static inline int __check_agg_selection_timer(struct port *port)
  */
 static inline void __get_rx_machine_lock(struct port *port)
 {
-	spin_lock(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
+	spin_lock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 }
 
 /**
@@ -320,7 +320,7 @@ static inline void __get_rx_machine_lock(struct port *port)
  */
 static inline void __release_rx_machine_lock(struct port *port)
 {
-	spin_unlock(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
+	spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 }
 
 /**
-- 
1.5.2.4

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