[PKT_SCHED]: Do not check netif_queue_stopped() in dequeue ops, races with driver.

Based upon a patch from Stephen Hemminger.
Signed-off-by: David S. Miller <davem@redhat.com>

net/sched/sch_cbq.c

@@ -1054,7 +1054,7 @@ cbq_dequeue(struct Qdisc *sch)
 
 	if (sch->q.qlen) {
 		sch->stats.overlimits++;
-		if (q->wd_expires && !netif_queue_stopped(sch->dev)) {
+		if (q->wd_expires) {
 			long delay = PSCHED_US2JIFFIE(q->wd_expires);
 			if (delay <= 0)
 				delay = 1;

net/sched/sch_delay.c

@@ -111,7 +111,7 @@ static struct sk_buff *dly_dequeue(struct Qdisc *sch)
 	if (skb) {
 		struct dly_skb_cb *cb = (struct dly_skb_cb *)skb->cb;
 		psched_time_t now;
-		long diff;
+		long diff, delay;
 
 		PSCHED_GET_TIME(now);
 		diff = q->latency - PSCHED_TDIFF(now, cb->queuetime);
@@ -128,12 +128,10 @@ static struct sk_buff *dly_dequeue(struct Qdisc *sch)
 			goto retry;
 		}
 
-		if (!netif_queue_stopped(sch->dev)) {
-			long delay = PSCHED_US2JIFFIE(diff);
-			if (delay <= 0)
-				delay = 1;
-			mod_timer(&q->timer, jiffies+delay);
-		}
+		delay = PSCHED_US2JIFFIE(diff);
+		if (delay <= 0)
+		  delay = 1;
+		mod_timer(&q->timer, jiffies+delay);
 
 		sch->flags |= TCQ_F_THROTTLED;
 	}

net/sched/sch_hfsc.c

@@ -1721,8 +1721,7 @@ hfsc_dequeue(struct Qdisc *sch)
 		cl = actlist_get_minvt(&q->root, cur_time);
 		if (cl == NULL) {
 			sch->stats.overlimits++;
-			if (!netif_queue_stopped(sch->dev))
-				hfsc_schedule_watchdog(sch, cur_time);
+			hfsc_schedule_watchdog(sch, cur_time);
 			return NULL;
 		}
 	}

net/sched/sch_htb.c

@@ -1008,7 +1008,6 @@ htb_dequeue_tree(struct htb_sched *q,int prio,int level)
 static void htb_delay_by(struct Qdisc *sch,long delay)
 {
 	struct htb_sched *q = (struct htb_sched *)sch->data;
-	if (netif_queue_stopped(sch->dev)) return;
 	if (delay <= 0) delay = 1;
 	if (unlikely(delay > 5*HZ)) {
 		if (net_ratelimit())

net/sched/sch_tbf.c

@@ -201,7 +201,7 @@ static struct sk_buff *tbf_dequeue(struct Qdisc* sch)
 
 	if (skb) {
 		psched_time_t now;
-		long toks;
+		long toks, delay;
 		long ptoks = 0;
 		unsigned int len = skb->len;
 
@@ -229,14 +229,12 @@ static struct sk_buff *tbf_dequeue(struct Qdisc* sch)
 			return skb;
 		}
 
-		if (!netif_queue_stopped(sch->dev)) {
-			long delay = PSCHED_US2JIFFIE(max_t(long, -toks, -ptoks));
+		delay = PSCHED_US2JIFFIE(max_t(long, -toks, -ptoks));
 
-			if (delay == 0)
-				delay = 1;
+		if (delay == 0)
+			delay = 1;
 
-			mod_timer(&q->wd_timer, jiffies+delay);
-		}
+		mod_timer(&q->wd_timer, jiffies+delay);
 
 		/* Maybe we have a shorter packet in the queue,
 		   which can be sent now. It sounds cool,