1 files changed, 125 insertions, 273 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 826560753389..b527c1bd8bb2 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -51,8 +51,6 @@ MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to "
 	" the driver to wait for userspace to write the undock sysfs file "
 	" before undocking");
 
-static struct atomic_notifier_head dock_notifier_list;
-
 static const struct acpi_device_id dock_device_ids[] = {
 	{"LNXDOCK", 0},
 	{"", 0},
@@ -63,8 +61,6 @@ struct dock_station {
 	acpi_handle handle;
 	unsigned long last_dock_time;
 	u32 flags;
-	spinlock_t dd_lock;
-	struct mutex hp_lock;
 	struct list_head dependent_devices;
 
 	struct list_head sibling;
@@ -91,6 +87,12 @@ struct dock_dependent_device {
 #define DOCK_EVENT	3
 #define UNDOCK_EVENT	2
 
+enum dock_callback_type {
+	DOCK_CALL_HANDLER,
+	DOCK_CALL_FIXUP,
+	DOCK_CALL_UEVENT,
+};
+
 /*****************************************************************************
  *                         Dock Dependent device functions                   *
  *****************************************************************************/
@@ -101,7 +103,7 @@ struct dock_dependent_device {
  *
  * Add the dependent device to the dock's dependent device list.
  */
-static int
+static int __init
 add_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
 {
 	struct dock_dependent_device *dd;
@@ -112,14 +114,21 @@ add_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
 
 	dd->handle = handle;
 	INIT_LIST_HEAD(&dd->list);
-
-	spin_lock(&ds->dd_lock);
 	list_add_tail(&dd->list, &ds->dependent_devices);
-	spin_unlock(&ds->dd_lock);
 
 	return 0;
 }
 
+static void remove_dock_dependent_devices(struct dock_station *ds)
+{
+	struct dock_dependent_device *dd, *aux;
+
+	list_for_each_entry_safe(dd, aux, &ds->dependent_devices, list) {
+		list_del(&dd->list);
+		kfree(dd);
+	}
+}
+
 /**
  * dock_init_hotplug - Initialize a hotplug device on a docking station.
  * @dd: Dock-dependent device.
@@ -135,19 +144,16 @@ static int dock_init_hotplug(struct dock_dependent_device *dd,
 	int ret = 0;
 
 	mutex_lock(&hotplug_lock);
-
-	if (dd->hp_context) {
+	if (WARN_ON(dd->hp_context)) {
 		ret = -EEXIST;
 	} else {
 		dd->hp_refcount = 1;
 		dd->hp_ops = ops;
 		dd->hp_context = context;
 		dd->hp_release = release;
+		if (init)
+			init(context);
 	}
-
-	if (!WARN_ON(ret) && init)
-		init(context);
-
 	mutex_unlock(&hotplug_lock);
 	return ret;
 }
@@ -162,27 +168,22 @@ static int dock_init_hotplug(struct dock_dependent_device *dd,
  */
 static void dock_release_hotplug(struct dock_dependent_device *dd)
 {
-	void (*release)(void *) = NULL;
-	void *context = NULL;
-
 	mutex_lock(&hotplug_lock);
-
 	if (dd->hp_context && !--dd->hp_refcount) {
+		void (*release)(void *) = dd->hp_release;
+		void *context = dd->hp_context;
+
 		dd->hp_ops = NULL;
-		context = dd->hp_context;
 		dd->hp_context = NULL;
-		release = dd->hp_release;
 		dd->hp_release = NULL;
+		if (release)
+			release(context);
 	}
-
-	if (release && context)
-		release(context);
-
 	mutex_unlock(&hotplug_lock);
 }
 
 static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event,
-			       bool uevent)
+			       enum dock_callback_type cb_type)
 {
 	acpi_notify_handler cb = NULL;
 	bool run = false;
@@ -192,8 +193,18 @@ static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event,
 	if (dd->hp_context) {
 		run = true;
 		dd->hp_refcount++;
-		if (dd->hp_ops)
-			cb = uevent ? dd->hp_ops->uevent : dd->hp_ops->handler;
+		if (dd->hp_ops) {
+			switch (cb_type) {
+			case DOCK_CALL_FIXUP:
+				cb = dd->hp_ops->fixup;
+				break;
+			case DOCK_CALL_UEVENT:
+				cb = dd->hp_ops->uevent;
+				break;
+			default:
+				cb = dd->hp_ops->handler;
+			}
+		}
 	}
 
 	mutex_unlock(&hotplug_lock);
@@ -220,63 +231,17 @@ find_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
 {
 	struct dock_dependent_device *dd;
 
-	spin_lock(&ds->dd_lock);
-	list_for_each_entry(dd, &ds->dependent_devices, list) {
-		if (handle == dd->handle) {
-			spin_unlock(&ds->dd_lock);
+	list_for_each_entry(dd, &ds->dependent_devices, list)
+		if (handle == dd->handle)
 			return dd;
-		}
-	}
-	spin_unlock(&ds->dd_lock);
+
 	return NULL;
 }
 
 /*****************************************************************************
  *                         Dock functions                                    *
  *****************************************************************************/
-/**
- * is_dock - see if a device is a dock station
- * @handle: acpi handle of the device
- *
- * If an acpi object has a _DCK method, then it is by definition a dock
- * station, so return true.
- */
-static int is_dock(acpi_handle handle)
-{
-	acpi_status status;
-	acpi_handle tmp;
-
-	status = acpi_get_handle(handle, "_DCK", &tmp);
-	if (ACPI_FAILURE(status))
-		return 0;
-	return 1;
-}
-
-static int is_ejectable(acpi_handle handle)
-{
-	acpi_status status;
-	acpi_handle tmp;
-
-	status = acpi_get_handle(handle, "_EJ0", &tmp);
-	if (ACPI_FAILURE(status))
-		return 0;
-	return 1;
-}
-
-static int is_ata(acpi_handle handle)
-{
-	acpi_handle tmp;
-
-	if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
-	   (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
-	   (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
-	   (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
-		return 1;
-
-	return 0;
-}
-
-static int is_battery(acpi_handle handle)
+static int __init is_battery(acpi_handle handle)
 {
 	struct acpi_device_info *info;
 	int ret = 1;
@@ -292,17 +257,13 @@ static int is_battery(acpi_handle handle)
 	return ret;
 }
 
-static int is_ejectable_bay(acpi_handle handle)
+/* Check whether ACPI object is an ejectable battery or disk bay */
+static bool __init is_ejectable_bay(acpi_handle handle)
 {
-	acpi_handle phandle;
+	if (acpi_has_method(handle, "_EJ0") && is_battery(handle))
+		return true;
 
-	if (!is_ejectable(handle))
-		return 0;
-	if (is_battery(handle) || is_ata(handle))
-		return 1;
-	if (!acpi_get_parent(handle, &phandle) && is_ata(phandle))
-		return 1;
-	return 0;
+	return acpi_bay_match(handle);
 }
 
 /**
@@ -320,7 +281,7 @@ int is_dock_device(acpi_handle handle)
 	if (!dock_station_count)
 		return 0;
 
-	if (is_dock(handle))
+	if (acpi_dock_match(handle))
 		return 1;
 
 	list_for_each_entry(dock_station, &dock_stations, sibling)
@@ -359,10 +320,8 @@ static int dock_present(struct dock_station *ds)
  *  handle if one does not exist already.  This should cause
  *  acpi to scan for drivers for the given devices, and call
  *  matching driver's add routine.
- *
- *  Returns a pointer to the acpi_device corresponding to the handle.
  */
-static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
+static void dock_create_acpi_device(acpi_handle handle)
 {
 	struct acpi_device *device;
 	int ret;
@@ -375,10 +334,7 @@ static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
 		ret = acpi_bus_scan(handle);
 		if (ret)
 			pr_debug("error adding bus, %x\n", -ret);
-
-		acpi_bus_get_device(handle, &device);
 	}
-	return device;
 }
 
 /**
@@ -397,9 +353,29 @@ static void dock_remove_acpi_device(acpi_handle handle)
 }
 
 /**
- * hotplug_dock_devices - insert or remove devices on the dock station
+ * hot_remove_dock_devices - Remove dock station devices.
+ * @ds: Dock station.
+ */
+static void hot_remove_dock_devices(struct dock_station *ds)
+{
+	struct dock_dependent_device *dd;
+
+	/*
+	 * Walk the list in reverse order so that devices that have been added
+	 * last are removed first (in case there are some indirect dependencies
+	 * between them).
+	 */
+	list_for_each_entry_reverse(dd, &ds->dependent_devices, list)
+		dock_hotplug_event(dd, ACPI_NOTIFY_EJECT_REQUEST, false);
+
+	list_for_each_entry_reverse(dd, &ds->dependent_devices, list)
+		dock_remove_acpi_device(dd->handle);
+}
+
+/**
+ * hotplug_dock_devices - Insert devices on a dock station.
  * @ds: the dock station
- * @event: either bus check or eject request
+ * @event: either bus check or device check request
  *
  * Some devices on the dock station need to have drivers called
  * to perform hotplug operations after a dock event has occurred.
@@ -410,27 +386,21 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event)
 {
 	struct dock_dependent_device *dd;
 
-	mutex_lock(&ds->hp_lock);
+	/* Call driver specific post-dock fixups. */
+	list_for_each_entry(dd, &ds->dependent_devices, list)
+		dock_hotplug_event(dd, event, DOCK_CALL_FIXUP);
 
-	/*
-	 * First call driver specific hotplug functions
-	 */
+	/* Call driver specific hotplug functions. */
 	list_for_each_entry(dd, &ds->dependent_devices, list)
-		dock_hotplug_event(dd, event, false);
+		dock_hotplug_event(dd, event, DOCK_CALL_HANDLER);
 
 	/*
-	 * Now make sure that an acpi_device is created for each
-	 * dependent device, or removed if this is an eject request.
-	 * This will cause acpi_drivers to be stopped/started if they
-	 * exist
+	 * Now make sure that an acpi_device is created for each dependent
+	 * device.  That will cause scan handlers to be attached to device
+	 * objects or acpi_drivers to be stopped/started if they are present.
 	 */
-	list_for_each_entry(dd, &ds->dependent_devices, list) {
-		if (event == ACPI_NOTIFY_EJECT_REQUEST)
-			dock_remove_acpi_device(dd->handle);
-		else
-			dock_create_acpi_device(dd->handle);
-	}
-	mutex_unlock(&ds->hp_lock);
+	list_for_each_entry(dd, &ds->dependent_devices, list)
+		dock_create_acpi_device(dd->handle);
 }
 
 static void dock_event(struct dock_station *ds, u32 event, int num)
@@ -453,44 +423,13 @@ static void dock_event(struct dock_station *ds, u32 event, int num)
 		kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 
 	list_for_each_entry(dd, &ds->dependent_devices, list)
-		dock_hotplug_event(dd, event, true);
+		dock_hotplug_event(dd, event, DOCK_CALL_UEVENT);
 
 	if (num != DOCK_EVENT)
 		kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 }
 
 /**
- * eject_dock - respond to a dock eject request
- * @ds: the dock station
- *
- * This is called after _DCK is called, to execute the dock station's
- * _EJ0 method.
- */
-static void eject_dock(struct dock_station *ds)
-{
-	struct acpi_object_list arg_list;
-	union acpi_object arg;
-	acpi_status status;
-	acpi_handle tmp;
-
-	/* all dock devices should have _EJ0, but check anyway */
-	status = acpi_get_handle(ds->handle, "_EJ0", &tmp);
-	if (ACPI_FAILURE(status)) {
-		pr_debug("No _EJ0 support for dock device\n");
-		return;
-	}
-
-	arg_list.count = 1;
-	arg_list.pointer = &arg;
-	arg.type = ACPI_TYPE_INTEGER;
-	arg.integer.value = 1;
-
-	status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL);
-	if (ACPI_FAILURE(status))
-		pr_debug("Failed to evaluate _EJ0!\n");
-}
-
-/**
  * handle_dock - handle a dock event
  * @ds: the dock station
  * @dock: to dock, or undock - that is the question
@@ -550,27 +489,6 @@ static inline void complete_undock(struct dock_station *ds)
 	ds->flags &= ~(DOCK_UNDOCKING);
 }
 
-static void dock_lock(struct dock_station *ds, int lock)
-{
-	struct acpi_object_list arg_list;
-	union acpi_object arg;
-	acpi_status status;
-
-	arg_list.count = 1;
-	arg_list.pointer = &arg;
-	arg.type = ACPI_TYPE_INTEGER;
-	arg.integer.value = !!lock;
-	status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL);
-	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-		if (lock)
-			acpi_handle_warn(ds->handle,
-				"Locking device failed (0x%x)\n", status);
-		else
-			acpi_handle_warn(ds->handle,
-				"Unlocking device failed (0x%x)\n", status);
-	}
-}
-
 /**
  * dock_in_progress - see if we are in the middle of handling a dock event
  * @ds: the dock station
@@ -588,37 +506,6 @@ static int dock_in_progress(struct dock_station *ds)
 }
 
 /**
- * register_dock_notifier - add yourself to the dock notifier list
- * @nb: the callers notifier block
- *
- * If a driver wishes to be notified about dock events, they can
- * use this function to put a notifier block on the dock notifier list.
- * this notifier call chain will be called after a dock event, but
- * before hotplugging any new devices.
- */
-int register_dock_notifier(struct notifier_block *nb)
-{
-	if (!dock_station_count)
-		return -ENODEV;
-
-	return atomic_notifier_chain_register(&dock_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(register_dock_notifier);
-
-/**
- * unregister_dock_notifier - remove yourself from the dock notifier list
- * @nb: the callers notifier block
- */
-void unregister_dock_notifier(struct notifier_block *nb)
-{
-	if (!dock_station_count)
-		return;
-
-	atomic_notifier_chain_unregister(&dock_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(unregister_dock_notifier);
-
-/**
  * register_hotplug_dock_device - register a hotplug function
  * @handle: the handle of the device
  * @ops: handlers to call after docking
@@ -703,10 +590,10 @@ static int handle_eject_request(struct dock_station *ds, u32 event)
 	 */
 	dock_event(ds, event, UNDOCK_EVENT);
 
-	hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST);
+	hot_remove_dock_devices(ds);
 	undock(ds);
-	dock_lock(ds, 0);
-	eject_dock(ds);
+	acpi_evaluate_lck(ds->handle, 0);
+	acpi_evaluate_ej0(ds->handle);
 	if (dock_present(ds)) {
 		acpi_handle_err(ds->handle, "Unable to undock!\n");
 		return -EBUSY;
@@ -717,18 +604,17 @@ static int handle_eject_request(struct dock_station *ds, u32 event)
 
 /**
  * dock_notify - act upon an acpi dock notification
- * @handle: the dock station handle
+ * @ds: dock station
  * @event: the acpi event
- * @data: our driver data struct
  *
  * If we are notified to dock, then check to see if the dock is
  * present and then dock.  Notify all drivers of the dock event,
  * and then hotplug and devices that may need hotplugging.
  */
-static void dock_notify(acpi_handle handle, u32 event, void *data)
+static void dock_notify(struct dock_station *ds, u32 event)
 {
-	struct dock_station *ds = data;
-	struct acpi_device *tmp;
+	acpi_handle handle = ds->handle;
+	struct acpi_device *ad;
 	int surprise_removal = 0;
 
 	/*
@@ -751,8 +637,7 @@ static void dock_notify(acpi_handle handle, u32 event, void *data)
 	switch (event) {
 	case ACPI_NOTIFY_BUS_CHECK:
 	case ACPI_NOTIFY_DEVICE_CHECK:
-		if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle,
-		   &tmp)) {
+		if (!dock_in_progress(ds) && acpi_bus_get_device(handle, &ad)) {
 			begin_dock(ds);
 			dock(ds);
 			if (!dock_present(ds)) {
@@ -760,12 +645,10 @@ static void dock_notify(acpi_handle handle, u32 event, void *data)
 				complete_dock(ds);
 				break;
 			}
-			atomic_notifier_call_chain(&dock_notifier_list,
-						   event, NULL);
 			hotplug_dock_devices(ds, event);
 			complete_dock(ds);
 			dock_event(ds, event, DOCK_EVENT);
-			dock_lock(ds, 1);
+			acpi_evaluate_lck(ds->handle, 1);
 			acpi_update_all_gpes();
 			break;
 		}
@@ -789,9 +672,8 @@ static void dock_notify(acpi_handle handle, u32 event, void *data)
 }
 
 struct dock_data {
-	acpi_handle handle;
-	unsigned long event;
 	struct dock_station *ds;
+	u32 event;
 };
 
 static void acpi_dock_deferred_cb(void *context)
@@ -799,52 +681,31 @@ static void acpi_dock_deferred_cb(void *context)
 	struct dock_data *data = context;
 
 	acpi_scan_lock_acquire();
-	dock_notify(data->handle, data->event, data->ds);
+	dock_notify(data->ds, data->event);
 	acpi_scan_lock_release();
 	kfree(data);
 }
 
-static int acpi_dock_notifier_call(struct notifier_block *this,
-	unsigned long event, void *data)
+static void dock_notify_handler(acpi_handle handle, u32 event, void *data)
 {
-	struct dock_station *dock_station;
-	acpi_handle handle = data;
+	struct dock_data *dd;
 
 	if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK
 	   && event != ACPI_NOTIFY_EJECT_REQUEST)
-		return 0;
-
-	acpi_scan_lock_acquire();
-
-	list_for_each_entry(dock_station, &dock_stations, sibling) {
-		if (dock_station->handle == handle) {
-			struct dock_data *dd;
-			acpi_status status;
-
-			dd = kmalloc(sizeof(*dd), GFP_KERNEL);
-			if (!dd)
-				break;
+		return;
 
-			dd->handle = handle;
-			dd->event = event;
-			dd->ds = dock_station;
-			status = acpi_os_hotplug_execute(acpi_dock_deferred_cb,
-							 dd);
-			if (ACPI_FAILURE(status))
-				kfree(dd);
+	dd = kmalloc(sizeof(*dd), GFP_KERNEL);
+	if (dd) {
+		acpi_status status;
 
-			break;
-		}
+		dd->ds = data;
+		dd->event = event;
+		status = acpi_os_hotplug_execute(acpi_dock_deferred_cb, dd);
+		if (ACPI_FAILURE(status))
+			kfree(dd);
 	}
-
-	acpi_scan_lock_release();
-	return 0;
 }
 
-static struct notifier_block dock_acpi_notifier = {
-	.notifier_call = acpi_dock_notifier_call,
-};
-
 /**
  * find_dock_devices - find devices on the dock station
  * @handle: the handle of the device we are examining
@@ -856,29 +717,16 @@ static struct notifier_block dock_acpi_notifier = {
  * check to see if an object has an _EJD method.  If it does, then it
  * will see if it is dependent on the dock station.
  */
-static acpi_status
-find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv)
+static acpi_status __init find_dock_devices(acpi_handle handle, u32 lvl,
+					    void *context, void **rv)
 {
-	acpi_status status;
-	acpi_handle tmp, parent;
 	struct dock_station *ds = context;
+	acpi_handle ejd = NULL;
 
-	status = acpi_bus_get_ejd(handle, &tmp);
-	if (ACPI_FAILURE(status)) {
-		/* try the parent device as well */
-		status = acpi_get_parent(handle, &parent);
-		if (ACPI_FAILURE(status))
-			goto fdd_out;
-		/* see if parent is dependent on dock */
-		status = acpi_bus_get_ejd(parent, &tmp);
-		if (ACPI_FAILURE(status))
-			goto fdd_out;
-	}
-
-	if (tmp == ds->handle)
+	acpi_bus_get_ejd(handle, &ejd);
+	if (ejd == ds->handle)
 		add_dock_dependent_device(ds, handle);
 
-fdd_out:
 	return AE_OK;
 }
 
@@ -988,13 +836,13 @@ static struct attribute_group dock_attribute_group = {
  */
 static int __init dock_add(acpi_handle handle)
 {
-	int ret, id;
-	struct dock_station ds, *dock_station;
+	struct dock_station *dock_station, ds = { NULL, };
 	struct platform_device *dd;
+	acpi_status status;
+	int ret;
 
-	id = dock_station_count;
-	memset(&ds, 0, sizeof(ds));
-	dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds));
+	dd = platform_device_register_data(NULL, "dock", dock_station_count,
+					   &ds, sizeof(ds));
 	if (IS_ERR(dd))
 		return PTR_ERR(dd);
 
@@ -1004,18 +852,15 @@ static int __init dock_add(acpi_handle handle)
 	dock_station->dock_device = dd;
 	dock_station->last_dock_time = jiffies - HZ;
 
-	mutex_init(&dock_station->hp_lock);
-	spin_lock_init(&dock_station->dd_lock);
 	INIT_LIST_HEAD(&dock_station->sibling);
-	ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
 	INIT_LIST_HEAD(&dock_station->dependent_devices);
 
 	/* we want the dock device to send uevents */
 	dev_set_uevent_suppress(&dd->dev, 0);
 
-	if (is_dock(handle))
+	if (acpi_dock_match(handle))
 		dock_station->flags |= DOCK_IS_DOCK;
-	if (is_ata(handle))
+	if (acpi_ata_match(handle))
 		dock_station->flags |= DOCK_IS_ATA;
 	if (is_battery(handle))
 		dock_station->flags |= DOCK_IS_BAT;
@@ -1034,11 +879,19 @@ static int __init dock_add(acpi_handle handle)
 	if (ret)
 		goto err_rmgroup;
 
+	status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+					     dock_notify_handler, dock_station);
+	if (ACPI_FAILURE(status)) {
+		ret = -ENODEV;
+		goto err_rmgroup;
+	}
+
 	dock_station_count++;
 	list_add(&dock_station->sibling, &dock_stations);
 	return 0;
 
 err_rmgroup:
+	remove_dock_dependent_devices(dock_station);
 	sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group);
 err_unregister:
 	platform_device_unregister(dd);
@@ -1058,7 +911,7 @@ err_unregister:
 static __init acpi_status
 find_dock_and_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
-	if (is_dock(handle) || is_ejectable_bay(handle))
+	if (acpi_dock_match(handle) || is_ejectable_bay(handle))
 		dock_add(handle);
 
 	return AE_OK;
@@ -1078,7 +931,6 @@ void __init acpi_dock_init(void)
 		return;
 	}
 
-	register_acpi_bus_notifier(&dock_acpi_notifier);
 	pr_info(PREFIX "%s: %d docks/bays found\n",
 		ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
 }