linux-kernel - Re: [PATCH v1 2/9] ACPI: processor: idle: Return failure if entry method is not buffer or integer type

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Message-ID: <CAJZ5v0jg5RGi-+i3LtwK6U8m+_C5Rs4OuRTBLTGi6g0aRq3LBQ@mail.gmail.com>
Date: Thu, 23 Oct 2025 12:07:17 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: "lihuisong (C)" <lihuisong@...wei.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, lenb@...nel.org, linux-acpi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Sudeep.Holla@....com, linuxarm@...wei.com, 
	jonathan.cameron@...wei.com, zhanjie9@...ilicon.com, zhenglifeng1@...wei.com, 
	yubowen8@...wei.com
Subject: Re: [PATCH v1 2/9] ACPI: processor: idle: Return failure if entry
 method is not buffer or integer type

On Thu, Oct 23, 2025 at 11:25 AM lihuisong (C) <lihuisong@...wei.com> wrote:
>
>
> 在 2025/10/22 3:34, Rafael J. Wysocki 写道:
> > On Mon, Sep 29, 2025 at 11:38 AM Huisong Li <lihuisong@...wei.com> wrote:
> >> According to ACPI spec, entry method in LPI sub-package must be buffer
> >> or integer. However, acpi_processor_evaluate_lpi() regeards it as success
> >> and treat it as an effective LPI state.
> > Is that the case?  AFAICS, it just gets to the next state in this case
> > and what's wrong with that?
> The flatten_lpi_states() would consider the state with illegal entry
> method sub-package as a valid one
> if the flag of this state is enabled(ACPI_LPI_STATE_FLAGS_ENABLED is set).
> And then cpuidle governor would use it because the caller of
> acpi_processor_ffh_lpi_probe() also don't see the return value.

So the problem appears to be that lpi_state increments in every step
of the loop, but it should only increment if the given state is valid.