ntb_netdev: Simplify remove with client device drvdata

Replace the elaborate private structure global linked-list used in
ntb_netdev_probe() and ntb_netdev_remove() by stashing our private
data in the NTB transport client device.

Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

drivers/net/ntb_netdev.c

@@ -71,7 +71,6 @@ static unsigned int tx_start = 10;
 static unsigned int tx_stop = 5;
 
 struct ntb_netdev {
-	struct list_head list;
 	struct pci_dev *pdev;
 	struct net_device *ndev;
 	struct ntb_transport_qp *qp;
@@ -81,8 +80,6 @@ struct ntb_netdev {
 #define	NTB_TX_TIMEOUT_MS	1000
 #define	NTB_RXQ_SIZE		100
 
-static LIST_HEAD(dev_list);
-
 static void ntb_netdev_event_handler(void *data, int link_is_up)
 {
 	struct net_device *ndev = data;
@@ -452,7 +449,7 @@ static int ntb_netdev_probe(struct device *client_dev)
 	if (rc)
 		goto err1;
 
-	list_add(&dev->list, &dev_list);
+	dev_set_drvdata(client_dev, ndev);
 	dev_info(&pdev->dev, "%s created\n", ndev->name);
 	return 0;
 
@@ -465,27 +462,8 @@ err:
 
 static void ntb_netdev_remove(struct device *client_dev)
 {
-	struct ntb_dev *ntb;
-	struct net_device *ndev;
-	struct pci_dev *pdev;
-	struct ntb_netdev *dev;
-	bool found = false;
-
-	ntb = dev_ntb(client_dev->parent);
-	pdev = ntb->pdev;
-
-	list_for_each_entry(dev, &dev_list, list) {
-		if (dev->pdev == pdev) {
-			found = true;
-			break;
-		}
-	}
-	if (!found)
-		return;
-
-	list_del(&dev->list);
-
-	ndev = dev->ndev;
+	struct net_device *ndev = dev_get_drvdata(client_dev);
+	struct ntb_netdev *dev = netdev_priv(ndev);
 
 	unregister_netdev(ndev);
 	ntb_transport_free_queue(dev->qp);