linux-kernel - Re: [PATCH v1 1/1] ACPI: x86: s2idle: Switch to use acpi_evaluate_dsm

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Date:   Mon, 2 Oct 2023 09:04:58 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH v1 1/1] ACPI: x86: s2idle: Switch to use
 acpi_evaluate_dsm_typed()

On 10/2/2023 08:52, Andy Shevchenko wrote:
> The acpi_evaluate_dsm_typed() provides a way to check the type of the
> object evaluated by _DSM call. Use it instead of open coded variant.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Reviewed-by: Mario Limonciello <mario.limonciello@....com>

> ---
>   drivers/acpi/x86/s2idle.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c
> index 08f7c6708206..7d64e655f1b8 100644
> --- a/drivers/acpi/x86/s2idle.c
> +++ b/drivers/acpi/x86/s2idle.c
> @@ -417,11 +417,10 @@ static int validate_dsm(acpi_handle handle, const char *uuid, int rev, guid_t *d
>   	int ret = -EINVAL;
>   
>   	guid_parse(uuid, dsm_guid);
> -	obj = acpi_evaluate_dsm(handle, dsm_guid, rev, 0, NULL);
>   
>   	/* Check if the _DSM is present and as expected. */
> -	if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length == 0 ||
> -	    obj->buffer.length > sizeof(u32)) {
> +	obj = acpi_evaluate_dsm_typed(handle, dsm_guid, rev, 0, NULL, ACPI_TYPE_BUFFER);
> +	if (!obj || obj->buffer.length == 0 || obj->buffer.length > sizeof(u32)) {
>   		acpi_handle_debug(handle,
>   				"_DSM UUID %s rev %d function 0 evaluation failed\n", uuid, rev);
>   		goto out;