ACPI: introduce notifier change to avoid duplicates

The battery driver already registers notification handler.
To avoid registering notification handler again,
introduce a notifier chain in global system notifier handler
and use it in dock driver.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 24 insertions, 22 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 799a0fd..2563bc6 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -748,6 +748,28 @@ static void dock_notify(acpi_handle handle, u32 event, void *data)
 	}
 }
 
+static int acpi_dock_notifier_call(struct notifier_block *this,
+	unsigned long event, void *data)
+{
+	struct dock_station *dock_station;
+	acpi_handle handle = (acpi_handle)data;
+
+	if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK
+	   && event != ACPI_NOTIFY_EJECT_REQUEST)
+		return 0;
+	list_for_each_entry(dock_station, &dock_stations, sibiling) {
+		if (dock_station->handle == handle) {
+			dock_notify(handle, event, dock_station);
+			return 0 ;
+		}
+	}
+	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
@@ -861,7 +883,6 @@ static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL);
 static int dock_add(acpi_handle handle)
 {
 	int ret;
-	acpi_status status;
 	struct dock_dependent_device *dd;
 	struct dock_station *dock_station;
 	struct platform_device *dock_device;
@@ -956,23 +977,10 @@ static int dock_add(acpi_handle handle)
 	}
 	add_dock_dependent_device(dock_station, dd);
 
-	/* register for dock events */
-	status = acpi_install_notify_handler(dock_station->handle,
-					     ACPI_SYSTEM_NOTIFY,
-					     dock_notify, dock_station);
-
-	if (ACPI_FAILURE(status)) {
-		printk(KERN_ERR PREFIX "Error installing notify handler\n");
-		ret = -ENODEV;
-		goto dock_add_err;
-	}
-
 	dock_station_count++;
 	list_add(&dock_station->sibiling, &dock_stations);
 	return 0;
 
-dock_add_err:
-	kfree(dd);
 dock_add_err_unregister:
 	device_remove_file(&dock_device->dev, &dev_attr_docked);
 	device_remove_file(&dock_device->dev, &dev_attr_undock);
@@ -990,7 +998,6 @@ dock_add_err_unregister:
 static int dock_remove(struct dock_station *dock_station)
 {
 	struct dock_dependent_device *dd, *tmp;
-	acpi_status status;
 	struct platform_device *dock_device = dock_station->dock_device;
 
 	if (!dock_station_count)
@@ -1001,13 +1008,6 @@ static int dock_remove(struct dock_station *dock_station)
 				 list)
 	    kfree(dd);
 
-	/* remove dock notify handler */
-	status = acpi_remove_notify_handler(dock_station->handle,
-					    ACPI_SYSTEM_NOTIFY,
-					    dock_notify);
-	if (ACPI_FAILURE(status))
-		printk(KERN_ERR "Error removing notify handler\n");
-
 	/* cleanup sysfs */
 	device_remove_file(&dock_device->dev, &dev_attr_docked);
 	device_remove_file(&dock_device->dev, &dev_attr_undock);
@@ -1069,6 +1069,7 @@ static int __init dock_init(void)
 		return 0;
 	}
 
+	register_acpi_bus_notifier(&dock_acpi_notifier);
 	printk(KERN_INFO PREFIX "%s: %d docks/bays found\n",
 		ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
 	return 0;
@@ -1078,6 +1079,7 @@ static void __exit dock_exit(void)
 {
 	struct dock_station *dock_station;
 
+	unregister_acpi_bus_notifier(&dock_acpi_notifier);
 	list_for_each_entry(dock_station, &dock_stations, sibiling)
 		dock_remove(dock_station);
 }