ACPI: PM: Drop parent state update from acpi_device_get_power()

The parent state update in acpi_device_get_power(), that occurs when the
child device turns out to be in D0 and the parent's power state is still
unknown, is highly questionable because it may cause the reference
counters of the power resources used by the parent in D0 (if any) to
underflow when the parent goes into a low-power state later.  Moreover,
there is no reason to do it on reads from the real_power_state sysfs
attribute of the child.

That check had been added by commit 8f7412a792bc ("ACPI / PM: Infer
parent power state from child if unknown, v2") before starting to
handle the "missing _PSC and no power resources" case directly in
acpi_bus_init_power(), as of commit b3785492268f ("ACPI / PM: Do not
power manage devices in unknown initial states").  It is not necessary
any more and commit b3785492268f should have removed it.

Drop it now.

Fixes: b3785492268f ("ACPI / PM: Do not power manage devices in unknown initial states")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Peixin Xie <peixin.xie@linux.spacemit.com>
Tested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Link: https://patch.msgid.link/5147279.31r3eYUQgx@rafael.j.wysocki
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

0 files changed, 0 insertions, 0 deletions