linux-kernel - Re: [PATCH v1 1/1] mmc: sdhci-pci: Switch to use acpi_evaluate_dsm

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Date:   Mon, 9 Oct 2023 19:15:36 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] mmc: sdhci-pci: Switch to use
 acpi_evaluate_dsm_typed()

On 2/10/23 16:51, 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>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci-pci-core.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
> index 7c14feb5db77..025b31aa712c 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -483,11 +483,12 @@ static int __intel_dsm(struct intel_host *intel_host, struct device *dev,
>  	int err = 0;
>  	size_t len;
>  
> -	obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &intel_dsm_guid, 0, fn, NULL);
> +	obj = acpi_evaluate_dsm_typed(ACPI_HANDLE(dev), &intel_dsm_guid, 0, fn, NULL,
> +				      ACPI_TYPE_BUFFER);
>  	if (!obj)
>  		return -EOPNOTSUPP;
>  
> -	if (obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < 1) {
> +	if (obj->buffer.length < 1) {
>  		err = -EINVAL;
>  		goto out;
>  	}