libertas: fix lbs_rtap attribute in sysfs

At least it doesn't oops when you attempt to read or write it now.
Only when you enable it and then later turn it off. And when it's
enabled I don't see how it actually works.

But one fewer oops is good, for now...
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/dev.h

@@ -143,8 +143,6 @@ struct lbs_private {
 	   all other bits reserved 0 */
 	u8 dnld_sent;
 
-	struct device *hotplug_device;
-
 	/** thread to service interrupts */
 	struct task_struct *main_thread;
 	wait_queue_head_t waitq;

drivers/net/wireless/libertas/main.c

@@ -256,8 +256,7 @@ void lbs_remove_rtap(struct lbs_private *priv);
 static ssize_t lbs_rtap_get(struct device *dev,
 		struct device_attribute *attr, char * buf)
 {
-	struct lbs_private *priv = (struct lbs_private *)
-		(to_net_dev(dev))->priv;
+	struct lbs_private *priv = to_net_dev(dev)->priv;
 	struct lbs_adapter *adapter = priv->adapter;
 	return snprintf(buf, 5, "0x%X\n", adapter->monitormode);
 }
@@ -269,8 +268,7 @@ static ssize_t lbs_rtap_set(struct device *dev,
 		struct device_attribute *attr, const char * buf, size_t count)
 {
 	int monitor_mode;
-	struct lbs_private *priv = (struct lbs_private *)
-		(to_net_dev(dev))->priv;
+	struct lbs_private *priv = to_net_dev(dev)->priv;
 	struct lbs_adapter *adapter = priv->adapter;
 
 	sscanf(buf, "%x", &monitor_mode);
@@ -1158,7 +1156,6 @@ struct lbs_private *lbs_add_card(void *card, struct device *dmdev)
 	priv->card = card;
 	priv->mesh_open = 0;
 	priv->infra_open = 0;
-	priv->hotplug_device = dmdev;
 
 	/* Setup the OS Interface to our functions */
 	dev->open = lbs_open;
@@ -1178,15 +1175,13 @@ struct lbs_private *lbs_add_card(void *card, struct device *dmdev)
 	SET_NETDEV_DEV(dev, dmdev);
 
 	priv->rtap_net_dev = NULL;
-	if (device_create_file(dmdev, &dev_attr_lbs_rtap))
-		goto err_init_adapter;
 
 	lbs_deb_thread("Starting main thread...\n");
 	init_waitqueue_head(&priv->waitq);
 	priv->main_thread = kthread_run(lbs_thread, dev, "lbs_main");
 	if (IS_ERR(priv->main_thread)) {
 		lbs_deb_thread("Error creating main thread.\n");
-		goto err_kthread_run;
+		goto err_init_adapter;
 	}
 
 	priv->work_thread = create_singlethread_workqueue("lbs_worker");
@@ -1196,9 +1191,6 @@ struct lbs_private *lbs_add_card(void *card, struct device *dmdev)
 
 	goto done;
 
-err_kthread_run:
-	device_remove_file(dmdev, &dev_attr_lbs_rtap);
-
 err_init_adapter:
 	lbs_free_adapter(priv);
 
@@ -1224,7 +1216,7 @@ int lbs_remove_card(struct lbs_private *priv)
 	lbs_remove_rtap(priv);
 
 	dev = priv->dev;
-	device_remove_file(priv->hotplug_device, &dev_attr_lbs_rtap);
+	device_remove_file(&dev->dev, &dev_attr_lbs_rtap);
 
 	cancel_delayed_work(&priv->scan_work);
 	cancel_delayed_work(&priv->assoc_work);
@@ -1273,6 +1265,8 @@ int lbs_start_card(struct lbs_private *priv)
 		lbs_pr_err("cannot register ethX device\n");
 		goto done;
 	}
+	if (device_create_file(&dev->dev, &dev_attr_lbs_rtap))
+		lbs_pr_err("cannot register lbs_rtap attribute\n");
 
 	lbs_debugfs_init_one(priv, dev);