[PATCH v3 0/4] ACPI: scan: Adjust power management initialization and PCI devices handling

[Rafael J. Wysocki]

Hi All,

This is an update of

https://lore.kernel.org/linux-acpi/5144065.31r3eYUQgx@rafael.j.wysocki/

that adds 1 patch, 3 two patches, and addresses review comments in patch [2/4].

The new patch drops in v3 is a cleanup relocating the acpi_bus_init_power()
declaration to an internal header file in the core ACPI support code (patch
[3/4]).

One of the patches dropped from the v2 has been folded into patch [2/4]
and the other two have become cleanups on top of this series that can be
done later.

Overall, the series aims at addressing a few issues present in the core ACPI
device enumeration code, mostly related to the acpi_bus_attach() function.

The first one is that, on some systems, ACPI power management is initialized
twice for devices that have missing dependencies to start with.  An attempt
to address this issue had been made during the 7.3 merge window, but it had
to be reverted [1].  The approach used here is roughly the same as in the
reverted commit, but it takes PCI devices (which are a special case) into
account.

In addition to the above, ACPI power management may be initialized prematurely
for device objects whose parents are not ready for enumeration.

The other issues are that flags are unnecessarily cleared by acpi_bus_attach()
for devices with missing dependencies and PCI devices are handled by
acpi_bus_attach() like any other devices which is a mistake.

Please see the changelogs of individual patches for details.

Thanks!


Link: https://lore.kernel.org/linux-acpi/20260820-acpi-power-resource-ref-fix-v2-1-29818173ea13@xxxxxxxxxxxxxxxxxx/ [1]