ACPI: PM: Do not turn off power resources in unknown state

Commit 6381195 ("ACPI: power: Rework turning off unused power
resources") caused power resources in unknown state with reference
counters equal to zero to be turned off too, but that caused issues
to appear in the field, so modify the code to only turn off power
resources that are known to be "on".

Link: https://lore.kernel.org/linux-acpi/[email protected]/
Fixes: 6381195 ("ACPI: power: Rework turning off unused power resources")
Reported-by: Andreas K. Huettel <[email protected]>
Tested-by: Andreas K. Huettel <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Cc: 5.14+ <[email protected]> # 5.14+

Author: rafaeljw

drivers/acpi/power.c

@@ -1035,13 +1035,8 @@ void acpi_turn_off_unused_power_resources(void)
 	list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) {
 		mutex_lock(&resource->resource_lock);
 
-		/*
-		 * Turn off power resources in an unknown state too, because the
-		 * platform firmware on some system expects the OS to turn off
-		 * power resources without any users unconditionally.
-		 */
 		if (!resource->ref_count &&
-		    resource->state != ACPI_POWER_RESOURCE_STATE_OFF) {
+		    resource->state == ACPI_POWER_RESOURCE_STATE_ON) {
 			acpi_handle_debug(resource->device.handle, "Turning OFF\n");
 			__acpi_power_off(resource);
 		}