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ACPI / hotplug / PCI: Hotplug notifications from acpi_bus_notify()

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Since acpi_bus_notify() is executed on all notifications for all
devices anyway, make it execute acpi_device_hotplug() for all
hotplug events instead of installing notify handlers pointing to
the same function for all hotplug devices.

This change reduces both the size and complexity of ACPI-based device
hotplug code.  Moreover, since acpi_device_hotplug() only does
significant things for devices that have either an ACPI scan handler,
or a hotplug context with .eject() defined, and those devices
had notify handlers pointing to acpi_hotplug_notify_cb() installed
before anyway, this modification shouldn't change functionality.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
2014-02-06 13:58:13 +01:00
parent 5e6f236c26
commit 1a699476e2
6 changed files with 58 additions and 114 deletions
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24
drivers/pci/hotplug/acpiphp_glue.c
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@@ -297,7 +297,6 @@ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
newfunc = &context->func;
newfunc->function = function;
newfunc->parent = bridge;
acpi_unlock_hp_context();
if (acpi_has_method(handle, "_EJ0"))
newfunc->flags = FUNC_HAS_EJ0;
@@ -305,8 +304,14 @@ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
if (acpi_has_method(handle, "_STA"))
newfunc->flags |= FUNC_HAS_STA;
/*
* Dock stations' notify handler should be used for dock devices instead
* of the common one, so clear hp.event in their contexts.
*/
if (acpi_has_method(handle, "_DCK"))
newfunc->flags |= FUNC_HAS_DCK;
context->hp.event = NULL;
acpi_unlock_hp_context();
/* search for objects that share the same slot */
list_for_each_entry(slot, &bridge->slots, node)
@@ -374,10 +379,6 @@ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
pr_debug("failed to register dock device\n");
}
/* install notify handler */
if (!(newfunc->flags & FUNC_HAS_DCK))
acpi_install_hotplug_notify_handler(handle);
return AE_OK;
}
@@ -411,13 +412,14 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
list_for_each_entry(slot, &bridge->slots, node) {
list_for_each_entry(func, &slot->funcs, sibling) {
acpi_handle handle = func_to_handle(func);
struct acpi_device *adev = func_to_acpi_device(func);
if (is_dock_device(handle))
unregister_hotplug_dock_device(handle);
if (is_dock_device(adev->handle))
unregister_hotplug_dock_device(adev->handle);
if (!(func->flags & FUNC_HAS_DCK))
acpi_remove_hotplug_notify_handler(handle);
acpi_lock_hp_context();
adev->hp->event = NULL;
acpi_unlock_hp_context();
}
slot->flags |= SLOT_IS_GOING_AWAY;
if (slot->slot)