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@fleish.org>.
Signed-off-by: NJay Vosburgh <fubar@us.ibm.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

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));
 }
 
 /**