ACPI / dock / PCI: Drop ACPI dock notifier chain
The only user of the ACPI dock notifier chain is the ACPI-based PCI
hotplug (acpiphp) driver that uses it to carry out post-dock fixups
needed by some systems with broken _DCK. However, it is not
necessary to use a separate notifier chain for that, as it can be
simply replaced with a new callback in struct acpi_dock_ops.
For this reason, add a new .fixup() callback to struct acpi_dock_ops
and make hotplug_dock_devices() execute it for all dock devices with
hotplug operations registered. Accordingly, make acpiphp point that
callback to the function carrying out the post-dock fixups and
do not register a separate dock notifier for each device
registering dock operations. Finally, drop the ACPI dock notifier
chain that has no more users.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 3e20b13..c89a9c3 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -51,8 +51,6 @@
" the driver to wait for userspace to write the undock sysfs file "
" before undocking");
-static struct atomic_notifier_head dock_notifier_list;
-
static const struct acpi_device_id dock_device_ids[] = {
{"LNXDOCK", 0},
{"", 0},
@@ -89,6 +87,12 @@
#define DOCK_EVENT 3
#define UNDOCK_EVENT 2
+enum dock_callback_type {
+ DOCK_CALL_HANDLER,
+ DOCK_CALL_FIXUP,
+ DOCK_CALL_UEVENT,
+};
+
/*****************************************************************************
* Dock Dependent device functions *
*****************************************************************************/
@@ -179,7 +183,7 @@
}
static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event,
- bool uevent)
+ enum dock_callback_type cb_type)
{
acpi_notify_handler cb = NULL;
bool run = false;
@@ -189,8 +193,18 @@
if (dd->hp_context) {
run = true;
dd->hp_refcount++;
- if (dd->hp_ops)
- cb = uevent ? dd->hp_ops->uevent : dd->hp_ops->handler;
+ if (dd->hp_ops) {
+ switch (cb_type) {
+ case DOCK_CALL_FIXUP:
+ cb = dd->hp_ops->fixup;
+ break;
+ case DOCK_CALL_UEVENT:
+ cb = dd->hp_ops->uevent;
+ break;
+ default:
+ cb = dd->hp_ops->handler;
+ }
+ }
}
mutex_unlock(&hotplug_lock);
@@ -372,9 +386,13 @@
{
struct dock_dependent_device *dd;
+ /* Call driver specific post-dock fixups. */
+ list_for_each_entry(dd, &ds->dependent_devices, list)
+ dock_hotplug_event(dd, event, DOCK_CALL_FIXUP);
+
/* Call driver specific hotplug functions. */
list_for_each_entry(dd, &ds->dependent_devices, list)
- dock_hotplug_event(dd, event, false);
+ dock_hotplug_event(dd, event, DOCK_CALL_HANDLER);
/*
* Now make sure that an acpi_device is created for each dependent
@@ -405,7 +423,7 @@
kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
list_for_each_entry(dd, &ds->dependent_devices, list)
- dock_hotplug_event(dd, event, true);
+ dock_hotplug_event(dd, event, DOCK_CALL_UEVENT);
if (num != DOCK_EVENT)
kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
@@ -488,37 +506,6 @@
}
/**
- * register_dock_notifier - add yourself to the dock notifier list
- * @nb: the callers notifier block
- *
- * If a driver wishes to be notified about dock events, they can
- * use this function to put a notifier block on the dock notifier list.
- * this notifier call chain will be called after a dock event, but
- * before hotplugging any new devices.
- */
-int register_dock_notifier(struct notifier_block *nb)
-{
- if (!dock_station_count)
- return -ENODEV;
-
- return atomic_notifier_chain_register(&dock_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(register_dock_notifier);
-
-/**
- * unregister_dock_notifier - remove yourself from the dock notifier list
- * @nb: the callers notifier block
- */
-void unregister_dock_notifier(struct notifier_block *nb)
-{
- if (!dock_station_count)
- return;
-
- atomic_notifier_chain_unregister(&dock_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(unregister_dock_notifier);
-
-/**
* register_hotplug_dock_device - register a hotplug function
* @handle: the handle of the device
* @ops: handlers to call after docking
@@ -658,8 +645,6 @@
complete_dock(ds);
break;
}
- atomic_notifier_call_chain(&dock_notifier_list,
- event, NULL);
hotplug_dock_devices(ds, event);
complete_dock(ds);
dock_event(ds, event, DOCK_EVENT);
@@ -945,7 +930,6 @@
return;
}
- ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
pr_info(PREFIX "%s: %d docks/bays found\n",
ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
}