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>
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index ccae305..0dc4494 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -496,6 +496,19 @@
return 0;
}
+static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
+int register_acpi_bus_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
+
+void unregister_acpi_bus_notifier(struct notifier_block *nb)
+{
+ blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
+
/**
* acpi_bus_notify
* ---------------
@@ -506,6 +519,8 @@
int result = 0;
struct acpi_device *device = NULL;
+ blocking_notifier_call_chain(&acpi_bus_notify_list,
+ type, (void *)handle);
if (acpi_bus_get_device(handle, &device))
return;
