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authorShaohua Li <shaohua.li@intel.com>2008-08-28 10:04:29 +0800
committerLen Brown <len.brown@intel.com>2008-09-23 23:04:43 -0400
commit6bd00a61ab63d4ceb635ae0316353c11c900b8d8 (patch)
tree249e417279df1448f1ad43c135c22990b5dde2cb /drivers/acpi/bus.c
parentdb350b084dc2cf816288643861ce07b0562dd723 (diff)
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>
Diffstat (limited to 'drivers/acpi/bus.c')
-rw-r--r--drivers/acpi/bus.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index ccae305ee55..0dc44945725 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -496,6 +496,19 @@ static int acpi_bus_check_scope(struct acpi_device *device)
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 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
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;