linux-kernel - Re: [PATCH v2 1/7] ACPI: processor: idle: Mark the state as invalid if its entry method is illegal

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Message-ID: <CAJZ5v0j5_+gOuuW8PdyzjOJ+Q__k9PrpM3X6=Q0d50u+d8SPpg@mail.gmail.com>
Date: Mon, 3 Nov 2025 18:49:57 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Huisong Li <lihuisong@...wei.com>
Cc: 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 v2 1/7] ACPI: processor: idle: Mark the state as invalid
 if its entry method is illegal

On Mon, Nov 3, 2025 at 9:42 AM Huisong Li <lihuisong@...wei.com> wrote:
>
> According to ACPI spec, entry method in LPI sub-package must be buffer
> or integer. And the entry method is very key in cpuidle. So mark the state
> as invalid.
>
> Fixes: a36a7fecfe60 ("ACPI / processor_idle: Add support for Low Power Idle(LPI) states")
> Signed-off-by: Huisong Li <lihuisong@...wei.com>
> ---
>  drivers/acpi/processor_idle.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> index 341825e8ac63..9f1040eac051 100644
> --- a/drivers/acpi/processor_idle.c
> +++ b/drivers/acpi/processor_idle.c
> @@ -956,6 +956,9 @@ static int acpi_processor_evaluate_lpi(acpi_handle handle,
>                         lpi_state->entry_method = ACPI_CSTATE_INTEGER;
>                         lpi_state->address = obj->integer.value;
>                 } else {
> +                       pr_debug("Entry method of state-%d is illegal, disable it.\n",
> +                                state_idx);
> +                       lpi_state->flags = 0;

Why does lpi_state->flags need to be cleared, isn't it 0 already?

>                         continue;
>                 }
>
> --