linux-kernel - Re: [PATCH] ACPI/PRM: Deal with table not present or no module found

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Date:   Fri, 6 Aug 2021 15:23:25 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Aubrey Li <aubrey.li@...el.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Aubrey Li <aubrey.li@...ux.intel.com>
Subject: Re: [PATCH] ACPI/PRM: Deal with table not present or no module found

On Fri, Aug 6, 2021 at 2:48 AM Aubrey Li <aubrey.li@...el.com> wrote:
>
> On the system PRMT table is not present, dmesg output:
>
>         $ dmesg | grep PRM
>         [    1.532237] ACPI: PRMT not present
>         [    1.532237] PRM: found 4294967277 modules
>
> The result of acpi_table_parse_entries need to be checked and return
> immediately if PRMT table is not present or no PRM module found.
>
> Signed-off-by: Aubrey Li <aubrey.li@...ux.intel.com>
> ---
>  drivers/acpi/prmt.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
> index 31cf9ae..1f6007a 100644
> --- a/drivers/acpi/prmt.c
> +++ b/drivers/acpi/prmt.c
> @@ -292,6 +292,12 @@ void __init init_prmt(void)
>         int mc = acpi_table_parse_entries(ACPI_SIG_PRMT, sizeof(struct acpi_table_prmt) +
>                                           sizeof (struct acpi_table_prmt_header),
>                                           0, acpi_parse_prmt, 0);
> +       /*
> +        * Return immediately if PRMT table is not present or no PRM module found.
> +        */
> +       if (mc <= 0)
> +               return;
> +
>         pr_info("PRM: found %u modules\n", mc);
>
>         status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
> --

Applied as 5.14-rc material, thanks!

However, since I'm on vacation next week, it will get into linux-next
after -rc6.