[NET]: Add missing memory barriors for __LINK_STATE_RX_SCHED handling.

drivers/net/tg3.c

@@ -258,6 +258,7 @@ static inline void __netif_rx_complete(struct net_device *dev)
 {
 	if (!test_bit(__LINK_STATE_RX_SCHED, &dev->state)) BUG();
 	list_del(&dev->poll_list);
+	smp_mb__before_clear_bit();
 	clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 }
 

include/linux/netdevice.h

@@ -820,6 +820,7 @@ static inline void netif_rx_complete(struct net_device *dev)
 	local_irq_save(flags);
 	if (!test_bit(__LINK_STATE_RX_SCHED, &dev->state)) BUG();
 	list_del(&dev->poll_list);
+	smp_mb__before_clear_bit();
 	clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 	local_irq_restore(flags);
 }

net/core/dev.c

@@ -1657,6 +1657,7 @@ static int process_backlog(struct net_device *backlog_dev, int *budget)
 	*budget -= work;
 
 	list_del(&backlog_dev->poll_list);
+	smp_mb__before_clear_bit();
 	clear_bit(__LINK_STATE_RX_SCHED, &backlog_dev->state);
 
 	if (queue->throttle) {