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

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Message-ID: <ec5029b0-553c-4a6c-b2a9-ef9943e553dc@intel.com>
Date:   Mon, 2 Oct 2023 22:27:02 +0200
From:   "Wilczynski, Michal" <michal.wilczynski@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        <nvdimm@...ts.linux.dev>, <linux-acpi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH v1 1/1] ACPI: NFIT: Switch to use
 acpi_evaluate_dsm_typed()



On 10/2/2023 3:54 PM, 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>
> ---
>  drivers/acpi/nfit/core.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index f96bf32cd368..280da408c02c 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -1737,9 +1737,8 @@ __weak void nfit_intel_shutdown_status(struct nfit_mem *nfit_mem)
>  	if ((nfit_mem->dsm_mask & (1 << func)) == 0)
>  		return;
>  
> -	out_obj = acpi_evaluate_dsm(handle, guid, revid, func, &in_obj);
> -	if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER
> -			|| out_obj->buffer.length < sizeof(smart)) {
> +	out_obj = acpi_evaluate_dsm_typed(handle, guid, revid, func, &in_obj, ACPI_TYPE_BUFFER);

This line is 90 characters long, wouldn't it be better to split it ?

> +	if (!out_obj || out_obj->buffer.length < sizeof(smart)) {
>  		dev_dbg(dev->parent, "%s: failed to retrieve initial health\n",
>  				dev_name(dev));

While at it maybe fix alignment ? :-)

>  		ACPI_FREE(out_obj);

Just nitpicks, functionally code seems correct to me.
Reviewed-by: Michal Wilczynski <michal.wilczynski@...el.com>