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ACPI / PM: Add function for device power state initialization

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Add function acpi_bus_init_power() for getting the initial power
state of an ACPI device and reference counting its power resources
as appropriate.

Make acpi_bus_get_power_flags() use the new function instead of
acpi_bus_get_power() that updates device->power.state without
reference counting the device's power resources.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki
2010-11-25 00:08:36 +01:00
committed by Len Brown
parent 5e6d4fe429
commit ade3e7fef7
3 changed files with 27 additions and 4 deletions
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5
drivers/acpi/scan.c
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@ -901,10 +901,7 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
device->power.states[ACPI_STATE_D3].flags.valid = 1;
device->power.states[ACPI_STATE_D3].power = 0;
/* TBD: System wake support and resource requirements. */
device->power.state = ACPI_STATE_UNKNOWN;
acpi_bus_get_power(device->handle, &(device->power.state));
acpi_bus_init_power(device);
return 0;
}