Commit a1224f34 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI: PM: Check states of power resources during initialization 



To avoid situations in which the actual states of certain ACPI power
resources are not known just because they have never been referenced
by any device configuration objects, check the initial states of all
power resources as soon as they are found in the ACPI namespace (and
fall back to turning them on if the state check fails).

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: default avatarAndreas K. Huettel <andreas.huettel@ur.de>
parent bc283685

drivers/acpi/power.c

+5 −0
Original line number Diff line number Diff line
@@ -943,6 +943,7 @@ struct acpi_device *acpi_add_power_resource(acpi_handle handle) 
	union acpi_object acpi_object;

	struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };

	acpi_status status;

	u8 state_dummy;

	int result;



	acpi_bus_get_device(handle, &device);
@@ -971,6 +972,10 @@ struct acpi_device *acpi_add_power_resource(acpi_handle handle) 
	resource->order = acpi_object.power_resource.resource_order;

	resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;



	/* Get the initial state or just flip it on if that fails. */

	if (acpi_power_get_state(resource, &state_dummy))

		__acpi_power_on(resource);



	pr_info("%s [%s]\n", acpi_device_name(device), acpi_device_bid(device));



	device->flags.match_driver = true;