1 files changed, 22 insertions, 16 deletions

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 5ff0cfd14..6febc053a 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -291,7 +291,7 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
 		struct sk_buff *skb;
 		unsigned short id;
 		grant_ref_t ref;
-		unsigned long pfn;
+		unsigned long gfn;
 		struct xen_netif_rx_request *req;
 
 		skb = xennet_alloc_one_rx_buffer(queue);
@@ -307,12 +307,12 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
 		BUG_ON((signed short)ref < 0);
 		queue->grant_rx_ref[id] = ref;
 
-		pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0]));
+		gfn = xen_page_to_gfn(skb_frag_page(&skb_shinfo(skb)->frags[0]));
 
 		req = RING_GET_REQUEST(&queue->rx, req_prod);
 		gnttab_grant_foreign_access_ref(ref,
 						queue->info->xbdev->otherend_id,
-						pfn_to_mfn(pfn),
+						gfn,
 						0);
 
 		req->id = id;
@@ -430,8 +430,10 @@ static struct xen_netif_tx_request *xennet_make_one_txreq(
 	ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
 	BUG_ON((signed short)ref < 0);
 
-	gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id,
-					page_to_mfn(page), GNTMAP_readonly);
+	gnttab_grant_foreign_access_ref(ref,
+					queue->info->xbdev->otherend_id,
+					xen_page_to_gfn(page),
+					GNTMAP_readonly);
 
 	queue->tx_skbs[id].skb = skb;
 	queue->grant_tx_page[id] = page;
@@ -1336,7 +1338,7 @@ static void xennet_disconnect_backend(struct netfront_info *info)
 
 	netif_carrier_off(info->netdev);
 
-	for (i = 0; i < num_queues; ++i) {
+	for (i = 0; i < num_queues && info->queues; ++i) {
 		struct netfront_queue *queue = &info->queues[i];
 
 		if (queue->tx_irq && (queue->tx_irq == queue->rx_irq))
@@ -1704,19 +1706,19 @@ static void xennet_destroy_queues(struct netfront_info *info)
 }
 
 static int xennet_create_queues(struct netfront_info *info,
-				unsigned int num_queues)
+				unsigned int *num_queues)
 {
 	unsigned int i;
 	int ret;
 
-	info->queues = kcalloc(num_queues, sizeof(struct netfront_queue),
+	info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue),
 			       GFP_KERNEL);
 	if (!info->queues)
 		return -ENOMEM;
 
 	rtnl_lock();
 
-	for (i = 0; i < num_queues; i++) {
+	for (i = 0; i < *num_queues; i++) {
 		struct netfront_queue *queue = &info->queues[i];
 
 		queue->id = i;
@@ -1726,7 +1728,7 @@ static int xennet_create_queues(struct netfront_info *info,
 		if (ret < 0) {
 			dev_warn(&info->netdev->dev,
 				 "only created %d queues\n", i);
-			num_queues = i;
+			*num_queues = i;
 			break;
 		}
 
@@ -1736,11 +1738,11 @@ static int xennet_create_queues(struct netfront_info *info,
 			napi_enable(&queue->napi);
 	}
 
-	netif_set_real_num_tx_queues(info->netdev, num_queues);
+	netif_set_real_num_tx_queues(info->netdev, *num_queues);
 
 	rtnl_unlock();
 
-	if (num_queues == 0) {
+	if (*num_queues == 0) {
 		dev_err(&info->netdev->dev, "no queues\n");
 		return -EINVAL;
 	}
@@ -1786,7 +1788,7 @@ static int talk_to_netback(struct xenbus_device *dev,
 	if (info->queues)
 		xennet_destroy_queues(info);
 
-	err = xennet_create_queues(info, num_queues);
+	err = xennet_create_queues(info, &num_queues);
 	if (err < 0)
 		goto destroy_ring;
 
@@ -2102,7 +2104,8 @@ static int xennet_remove(struct xenbus_device *dev)
 
 	unregister_netdev(info->netdev);
 
-	xennet_destroy_queues(info);
+	if (info->queues)
+		xennet_destroy_queues(info);
 	xennet_free_netdev(info->netdev);
 
 	return 0;
@@ -2131,8 +2134,11 @@ static int __init netif_init(void)
 
 	pr_info("Initialising Xen virtual ethernet driver\n");
 
-	/* Allow as many queues as there are CPUs, by default */
-	xennet_max_queues = num_online_cpus();
+	/* Allow as many queues as there are CPUs if user has not
+	 * specified a value.
+	 */
+	if (xennet_max_queues == 0)
+		xennet_max_queues = num_online_cpus();
 
 	return xenbus_register_frontend(&netfront_driver);
 }