net: cleanups in RX queue allocation

Clean up in RX queue allocation.  In netif_set_real_num_rx_queues
return error on attempt to set zero queues, or requested number is
greater than number of allocated queues.  In netif_alloc_rx_queues,
do BUG_ON if queue_count is zero.
Signed-off-by: NTom Herbert <therbert@google.com>
Acked-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -1583,12 +1583,12 @@ int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
 {
 	int rc;
 
+	if (rxq < 1 || rxq > dev->num_rx_queues)
+		return -EINVAL;
+
 	if (dev->reg_state == NETREG_REGISTERED) {
 		ASSERT_RTNL();
 
-		if (rxq > dev->num_rx_queues)
-			return -EINVAL;
-
 		rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
 						  rxq);
 		if (rc)
@@ -5013,14 +5013,13 @@ static int netif_alloc_rx_queues(struct net_device *dev)
 {
 #ifdef CONFIG_RPS
 	unsigned int i, count = dev->num_rx_queues;
-
-	if (count) {
 	struct netdev_rx_queue *rx;
 
+	BUG_ON(count < 1);
+
 	rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
 	if (!rx) {
-			pr_err("netdev: Unable to allocate %u rx queues.\n",
-			       count);
+		pr_err("netdev: Unable to allocate %u rx queues.\n", count);
 		return -ENOMEM;
 	}
 	dev->_rx = rx;
@@ -5031,7 +5030,6 @@ static int netif_alloc_rx_queues(struct net_device *dev)
 	 */
 	for (i = 0; i < count; i++)
 		rx[i].first = rx;
-	}
 #endif
 	return 0;
 }