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>
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@ -306,6 +306,12 @@ int acpi_device_set_power(struct acpi_device *device, int state)
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* a lower-powered state.
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*/
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if (state < device->power.state) {
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if (device->power.state >= ACPI_STATE_D3_HOT &&
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state != ACPI_STATE_D0) {
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printk(KERN_WARNING PREFIX
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"Cannot transition to non-D0 state from D3\n");
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return -ENODEV;
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}
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if (device->power.flags.power_resources) {
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result = acpi_power_transition(device, state);
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if (result)
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