ACPI: PM: Turn off unused wakeup power resources
authorRafael J. Wysocki <rafael.j.wysocki@intel.com>
Fri, 15 Oct 2021 17:01:28 +0000 (19:01 +0200)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tue, 19 Oct 2021 17:35:39 +0000 (19:35 +0200)
commit7a63296d6f579a02b2675b4b0fe5b1cd3235e8d3
tree0f6f75f510f81b568f3e701e189a2871c8b39efe
parenta1224f34d72a103829d6953935d6c6621f135b83
ACPI: PM: Turn off unused wakeup power resources

If an ACPI power resource is found to be "on" during the
initialization of the list of wakeup power resources of a device,
it is reference counted and its wakeup_enabled flag is set, which is
problematic if the deivce in question is the only user of the given
power resource, it is never runtime-suspended and it is not allowed
to wake up the system from sleep, because in that case the given
power resource will stay "on" until the system reboots and energy
will be wasted.

It is better to simply turn off wakeup power resources that are "on"
during the initialization unless their reference counters are not
zero, because that may be the only opportunity to prevent them from
staying in the "on" state all the time.

Fixes: b5d667eb392e ("ACPI / PM: Take unusual configurations of power resources into account")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/acpi/power.c