netdevice: Move qdisc_list back into net_device proper.

And give it it's own lock.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1e839fa..3170bce 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -450,7 +450,6 @@
 	spinlock_t		_xmit_lock;
 	int			xmit_lock_owner;
 	struct Qdisc		*qdisc_sleeping;
-	struct list_head	qdisc_list;
 } ____cacheline_aligned_in_smp;
 
 /*
@@ -638,6 +637,8 @@
 	unsigned int		real_num_tx_queues;
 
 	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
+	spinlock_t		qdisc_list_lock;
+	struct list_head	qdisc_list;
 
 /*
  * One part is mostly used on xmit path (device)