qdisc: adjustments for API allowing skb list xmits

Minor adjustments for merge commit 53fda7f7 (Merge branch 'xmit_list')
that allows us to work with a list of SKBs.

Update code doc to function sch_direct_xmit().

In handle_dev_cpu_collision() use kfree_skb_list() in error handling.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_generic.c

@@ -93,7 +93,7 @@ static inline int handle_dev_cpu_collision(struct sk_buff *skb,
 		 * detect it by checking xmit owner and drop the packet when
 		 * deadloop is detected. Return OK to try the next skb.
 		 */
-		kfree_skb(skb);
+		kfree_skb_list(skb);
 		net_warn_ratelimited("Dead loop on netdevice %s, fix it urgently!\n",
 				     dev_queue->dev->name);
 		ret = qdisc_qlen(q);
@@ -110,9 +110,9 @@ static inline int handle_dev_cpu_collision(struct sk_buff *skb,
 }
 
 /*
- * Transmit one skb, and handle the return status as required. Holding the
- * __QDISC___STATE_RUNNING bit guarantees that only one CPU can execute this
- * function.
+ * Transmit possibly several skbs, and handle the return status as
+ * required. Holding the __QDISC___STATE_RUNNING bit guarantees that
+ * only one CPU can execute this function.
  *
  * Returns to the caller:
  *				0  - queue is empty or throttled.