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Date: Sat, 11 Oct 2008 02:35:52 -0400
From: Len Brown <lenb@...nel.org>
To: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Shaohua Li <shaohua.li@...el.com>, Len Brown <len.brown@...el.com>
Subject: [PATCH 32/85] ACPI: introduce notifier change to avoid duplicates
From: Shaohua Li <shaohua.li@...el.com>
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@...el.com>
Signed-off-by: Len Brown <len.brown@...el.com>
---
drivers/acpi/bus.c | 15 +++++++++++++++
drivers/acpi/dock.c | 46 ++++++++++++++++++++++++----------------------
include/acpi/acpi_bus.h | 3 +++
3 files changed, 42 insertions(+), 22 deletions(-)
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 @@ 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;
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);
}
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index a5ac0bc..f74f882 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -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
*/
--
1.5.5.1
--
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