diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 3bd8982..cfcd8ee 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -843,8 +843,7 @@
 {
 	struct acpi_device *tmp;
 
-	struct dock_station *dock_station = *((struct dock_station **)
-		dev->platform_data);
+	struct dock_station *dock_station = dev->platform_data;
 
 	if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp)))
 		return snprintf(buf, PAGE_SIZE, "1\n");
@@ -858,8 +857,7 @@
 static ssize_t show_flags(struct device *dev,
 			  struct device_attribute *attr, char *buf)
 {
-	struct dock_station *dock_station = *((struct dock_station **)
-		dev->platform_data);
+	struct dock_station *dock_station = dev->platform_data;
 	return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags);
 
 }
@@ -872,8 +870,7 @@
 			   const char *buf, size_t count)
 {
 	int ret;
-	struct dock_station *dock_station = *((struct dock_station **)
-		dev->platform_data);
+	struct dock_station *dock_station = dev->platform_data;
 
 	if (!count)
 		return -EINVAL;
@@ -891,8 +888,7 @@
 			     struct device_attribute *attr, char *buf)
 {
 	unsigned long long lbuf;
-	struct dock_station *dock_station = *((struct dock_station **)
-		dev->platform_data);
+	struct dock_station *dock_station = dev->platform_data;
 	acpi_status status = acpi_evaluate_integer(dock_station->handle,
 					"_UID", NULL, &lbuf);
 	if (ACPI_FAILURE(status))
@@ -905,8 +901,7 @@
 static ssize_t show_dock_type(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	struct dock_station *dock_station = *((struct dock_station **)
-		dev->platform_data);
+	struct dock_station *dock_station = dev->platform_data;
 	char *type;
 
 	if (dock_station->flags & DOCK_IS_DOCK)
@@ -944,20 +939,18 @@
  */
 static int dock_add(acpi_handle handle)
 {
-	int ret;
-	struct dock_station *dock_station;
+	int ret, id;
+	struct dock_station ds, *dock_station;
 	struct platform_device *dock_device;
 
+	id = dock_station_count;
 	dock_device =
-		platform_device_register_simple("dock",
-			dock_station_count, NULL, 0);
+		platform_device_register_data(NULL, "dock",
+			id, &ds, sizeof(ds));
 	if (IS_ERR(dock_device))
 		return PTR_ERR(dock_device);
 
-	/* allocate & initialize the dock_station private data */
-	dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL);
-	if (!dock_station)
-		return -ENOMEM;
+	dock_station = dock_device->dev.platform_data;
 	dock_station->handle = handle;
 	dock_station->dock_device = dock_device;
 	dock_station->last_dock_time = jiffies - HZ;
@@ -968,9 +961,6 @@
 	mutex_init(&dock_station->hp_lock);
 	ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
 
-	platform_device_add_data(dock_device, &dock_station,
-		sizeof(struct dock_station *));
-
 	/* we want the dock device to send uevents */
 	dev_set_uevent_suppress(&dock_device->dev, 0);
 
@@ -1003,9 +993,6 @@
 	sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group);
 err_unregister:
 	platform_device_unregister(dock_device);
-out:
-	kfree(dock_station);
-	dock_station = NULL;
 	printk(KERN_ERR "%s encountered error %d\n", __func__, ret);
 	return ret;
 }
@@ -1026,13 +1013,12 @@
 				 list)
 	    kfree(dd);
 
+	list_del(&dock_station->sibling);
+
 	/* cleanup sysfs */
 	sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group);
 	platform_device_unregister(dock_device);
 
-	/* free dock station memory */
-	kfree(dock_station);
-	dock_station = NULL;
 	return 0;
 }