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ACPI / PM: Handle missing _PSC in acpi_bus_update_power() 

If _PS0 is defined for an ACPI device node, but _PSC isn't and
the device node doesn't use power resources for power management,
acpi_bus_update_power() will fail to update the power state of it,
because acpi_device_get_power() returns ACPI_STATE_UNKNOWN in that
case.

To handle that situation make acpi_bus_update_power() follow
acpi_bus_init_power() and try to force the given device node into
power state D0.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2013-02-03 14:57:32 +01:00
parent b378549226
commit 511d5c4212
1 changed files with 3 additions and 0 deletions
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3
drivers/acpi/device_pm.c
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@ -355,6 +355,9 @@ int acpi_bus_update_power(acpi_handle handle, int *state_p)
if (result) if (result)
return result; return result;
if (state == ACPI_STATE_UNKNOWN)
state = ACPI_STATE_D0;
result = acpi_device_set_power(device, state); result = acpi_device_set_power(device, state);
if (!result && state_p) if (!result && state_p)
*state_p = state; *state_p = state;