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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>
This commit is contained in:
Rafael J. Wysocki 2013-07-05 03:03:25 +02:00
parent e6c215f15a
commit f09ce741a0
4 changed files with 30 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
drivers/acpi/dock.c
View File

@ -51,8 +51,6 @@ MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to "
" 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 @@ struct dock_dependent_device {
#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_release_hotplug(struct dock_dependent_device *dd)
}
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 @@ static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event,
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 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event)
{
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 @@ static void dock_event(struct dock_station *ds, u32 event, int num)
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);
@ -487,37 +505,6 @@ static int dock_in_progress(struct dock_station *ds)
return 0;
}
/**
* 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
@ -658,8 +645,6 @@ static void dock_notify(struct dock_station *ds, u32 event)
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 @@ void __init acpi_dock_init(void)
return;
}
ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
pr_info(PREFIX "%s: %d docks/bays found\n",
ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
}

1
drivers/pci/hotplug/acpiphp.h
View File

@ -122,7 +122,6 @@ struct acpiphp_func {
struct acpiphp_slot *slot; /* parent */
struct list_head sibling;
struct notifier_block nb;
acpi_handle handle;
u8 function; /* pci function# */

18
drivers/pci/hotplug/acpiphp_glue.c
View File

@ -119,15 +119,14 @@ static void free_bridge(struct kref *kref)
* TBD - figure out a way to only call fixups for
* systems that require them.
*/
static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
void *v)
static void post_dock_fixups(acpi_handle not_used, u32 event, void *data)
{
struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
struct acpiphp_func *func = data;
struct pci_bus *bus = func->slot->bridge->pci_bus;
u32 buses;
if (!bus->self)
return NOTIFY_OK;
return;
/* fixup bad _DCK function that rewrites
* secondary bridge on slot
@ -143,11 +142,11 @@ static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
| ((unsigned int)(bus->busn_res.end) << 16);
pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
}
return NOTIFY_OK;
}
static const struct acpi_dock_ops acpiphp_dock_ops = {
.fixup = post_dock_fixups,
.handler = hotplug_event_func,
};
@ -315,14 +314,6 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
&acpiphp_dock_ops, newfunc,
acpiphp_dock_init, acpiphp_dock_release))
dbg("failed to register dock device\n");
/* we need to be notified when dock events happen
* outside of the hotplug operation, since we may
* need to do fixups before we can hotplug.
*/
newfunc->nb.notifier_call = post_dock_fixups;
if (register_dock_notifier(&newfunc->nb))
dbg("failed to register a dock notifier");
}
/* install notify handler */
@ -472,7 +463,6 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
list_for_each_entry(func, &slot->funcs, sibling) {
if (is_dock_device(func->handle)) {
unregister_hotplug_dock_device(func->handle);
unregister_dock_notifier(&func->nb);
}
if (!(func->flags & FUNC_HAS_DCK)) {
status = acpi_remove_notify_handler(func->handle,

10
include/acpi/acpi_drivers.h
View File

@ -113,14 +113,13 @@ void pci_acpi_crs_quirks(void);
Dock Station
-------------------------------------------------------------------------- */
struct acpi_dock_ops {
acpi_notify_handler fixup;
acpi_notify_handler handler;
acpi_notify_handler uevent;
};
#ifdef CONFIG_ACPI_DOCK
extern int is_dock_device(acpi_handle handle);
extern int register_dock_notifier(struct notifier_block *nb);
extern void unregister_dock_notifier(struct notifier_block *nb);
extern int register_hotplug_dock_device(acpi_handle handle,
const struct acpi_dock_ops *ops,
void *context,
@ -132,13 +131,6 @@ static inline int is_dock_device(acpi_handle handle)
{
return 0;
}
static inline int register_dock_notifier(struct notifier_block *nb)
{
return -ENODEV;
}
static inline void unregister_dock_notifier(struct notifier_block *nb)
{
}
static inline int register_hotplug_dock_device(acpi_handle handle,
const struct acpi_dock_ops *ops,
void *context,