Commit ddc150f7 authored by Lv Zheng's avatar Lv Zheng Committed by Rafael J. Wysocki
Browse files

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: default avatarLv Zheng <lv.zheng@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 5133375b

drivers/acpi/bus.c

+6 −0
Original line number Diff line number Diff line
@@ -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)

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