linux-kernel - Re: [PATCH] vfio: platform: Do not pass return buffer to ACPI

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Message-ID: <12a6fae1-c7c5-c531-fce7-1a57cf6122fa@redhat.com>
Date:   Tue, 18 Oct 2022 18:45:58 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     Rafael Mendonca <rafaelmendsr@...il.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Sinan Kaya <okaya@...eaurora.org>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfio: platform: Do not pass return buffer to ACPI _RST
 method

Hi Rafael,
On 10/18/22 17:28, Rafael Mendonca wrote:
> The ACPI _RST method has no return value, there's no need to pass a return
> buffer to acpi_evaluate_object().
>
> Fixes: d30daa33ec1d ("vfio: platform: call _RST method when using ACPI")
> Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Thanks

Eric
> ---
>  drivers/vfio/platform/vfio_platform_common.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
> index 55dc4f43c31e..1a0a238ffa35 100644
> --- a/drivers/vfio/platform/vfio_platform_common.c
> +++ b/drivers/vfio/platform/vfio_platform_common.c
> @@ -72,12 +72,11 @@ static int vfio_platform_acpi_call_reset(struct vfio_platform_device *vdev,
>  				  const char **extra_dbg)
>  {
>  #ifdef CONFIG_ACPI
> -	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
>  	struct device *dev = vdev->device;
>  	acpi_handle handle = ACPI_HANDLE(dev);
>  	acpi_status acpi_ret;
>  
> -	acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, &buffer);
> +	acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, NULL);
>  	if (ACPI_FAILURE(acpi_ret)) {
>  		if (extra_dbg)
>  			*extra_dbg = acpi_format_exception(acpi_ret);