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ACPI: introduce notifier change to avoid duplicates

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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>
This commit is contained in:
Shaohua Li
2008-08-28 10:04:29 +08:00
committed by Len Brown
parent db350b084d
commit 6bd00a61ab
3 changed files with 42 additions and 22 deletions
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15
drivers/acpi/bus.c
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@@ -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;