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ACPI / PM: Add check preventing transitioning to non-D0 state from D3. 

No power transitioning from D3 state up to a non-D0 state is allowed
so make acpi_device_set_power() fail and complain if such a transition
is attempted.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lv Zheng 2012-11-16 02:46:28 +01:00 committed by Rafael J. Wysocki
parent 5133375bb4
commit ddc150f7a3
1 changed files with 6 additions and 0 deletions
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6
drivers/acpi/bus.c
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@ -306,6 +306,12 @@ int acpi_device_set_power(struct acpi_device *device, int state)
* a lower-powered state.
*/
if (state < device->power.state) {
if (device->power.state >= ACPI_STATE_D3_HOT &&
state != ACPI_STATE_D0) {
printk(KERN_WARNING PREFIX
"Cannot transition to non-D0 state from D3\n");
return -ENODEV;
}
if (device->power.flags.power_resources) {
result = acpi_power_transition(device, state);
if (result)