Re: [PATCH v2] ACPI: PCI: Avoid misleading _OSC messages for non-PCIe host bridges without _OSC

> After commit 7d703df7f4f5 ("ACPI: bus: Split _OSC evaluation out of
> acpi_run_osc()"), the _OSC evaluation path now returns AE_ERROR to
> negotiate_os_control() instead of propagating AE_NOT_FOUND from
> acpi_evaluate_object().
> 
> This has not caused any functional issues so far, but it produces
> additional misleading messages for non-PCIe host bridges without _OSC on
> some Intel servers:
> 
>     kernel: ACPI: Enabled 2 GPEs in block 00 to 7F
>     kernel: ACPI: PCI Root Bridge [UNC0] (domain 0000 [bus fe])
>     kernel: acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI EDR HPX-Type3]
>   + kernel: acpi PNP0A03:00: _OSC: OS requested [PCIeHotplug SHPCHotplug PME AER PCIeCapability LTR DPC]
>   + kernel: acpi PNP0A03:00: _OSC: platform willing to grant [PCIeHotplug SHPCHotplug PME AER PCIeCapability LTR DPC]
>   + kernel: acpi PNP0A03:00: _OSC: platform retains control of PCIe features (AE_ERROR)
> [ ... ]
> 
> Fixes: 7d703df7f4f5 ("ACPI: bus: Split _OSC evaluation out of acpi_run_osc()")
> Link: https://lore.kernel.org/linux-acpi/[email protected]/
> Suggested-by: Rafael J. Wysocki <[email protected]>
> Signed-off-by: Kazuma Kondo <[email protected]>

Sashiko has reviewed this patch and found no issues. It looks great!

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