linux-kernel - Re: [PATCH] ACPI: PRM: Optimize the judgment logic for the PRM handler

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Message-ID: <CAJZ5v0gAz5J99ig7eu9AVhEHkusRpW_G=PXRy+E9vGc+MVE6rg@mail.gmail.com>
Date: Mon, 25 Aug 2025 19:49:10 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: shangsong <shangsong2@...mail.com>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, shangsong2@...ovo.com
Subject: Re: [PATCH] ACPI: PRM: Optimize the judgment logic for the PRM handler_address

On Tue, Aug 19, 2025 at 4:28 AM shangsong <shangsong2@...mail.com> wrote:
>
> From: Shang song (Lenovo) <shangsong2@...ovo.com>
>
> If the handler_address or mapped VA is NULL, the related buffer
> address and VA can be ignored.
>
> Signed-off-by: Shang song <shangsong2@...ovo.com>
> ---
>  drivers/acpi/prmt.c | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
> index be033bbb126a..3a501fcd78df 100644
> --- a/drivers/acpi/prmt.c
> +++ b/drivers/acpi/prmt.c
> @@ -150,15 +150,28 @@ acpi_parse_prmt(union acpi_subtable_headers *header, const unsigned long end)
>                 th = &tm->handlers[cur_handler];
>
>                 guid_copy(&th->guid, (guid_t *)handler_info->handler_guid);
> +
> +               /*
> +                * Print a error message if handler_address is NULL, the parse of VA also
> +                * can be skipped.
> +                */
> +               if (unlikely(!handler_info->handler_address)) {
> +                       pr_err("Skipping handler with NULL address for GUID: %pUL",
> +                                       (guid_t *)handler_info->handler_guid);

pr_info(), please.

> +                       continue;
> +               }
> +
>                 th->handler_addr =
>                         (void *)efi_pa_va_lookup(&th->guid, handler_info->handler_address);
>                 /*
> -                * Print a warning message if handler_addr is zero which is not expected to
> -                * ever happen.
> +                * Print a warning message and skip the parse of VA if handler_addr is zero
> +                * which is not expected to ever happen.
>                  */
> -               if (unlikely(!th->handler_addr))
> +               if (unlikely(!th->handler_addr)) {
>                         pr_warn("Failed to find VA of handler for GUID: %pUL, PA: 0x%llx",
>                                 &th->guid, handler_info->handler_address);
> +                       continue;
> +               }
>
>                 th->static_data_buffer_addr =
>                         efi_pa_va_lookup(&th->guid, handler_info->static_data_buffer_address);
> --