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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>
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/acpi/bus.c
View File

@ -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;

46
drivers/acpi/dock.c
View File

@ -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);
}

3
include/acpi/acpi_bus.h
View File

@ -327,6 +327,9 @@ int acpi_bus_get_private_data(acpi_handle, void **);
extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
extern int register_acpi_notifier(struct notifier_block *);
extern int unregister_acpi_notifier(struct notifier_block *);
extern int register_acpi_bus_notifier(struct notifier_block *nb);
extern void unregister_acpi_bus_notifier(struct notifier_block *nb);
/*
* External Functions
*/