[PATCH v1 0/7] ACPI: scan: Address power management initialization and PCI devices handling

[Rafael J. Wysocki]

Hi All,

This series aims at addressing a few issues present in the core ACPI device
enumeration code, mostly related to the acpi_bus_attach() function (that
gets renamed in one of the patches).

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.

The other issues are that flags are unnecessarily cleared by acpi_bus_attach()
for devices with missing dependencies, the "initialized" ACPI device object
flag is not particularly useful, the "visited" ACPI device object flag is
used for two different things which is confusing at best, and that 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.

I have tested this series on a couple of machines, but let's see what
Sashiko has to say about it.

Thanks!


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