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

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Date:   Tue, 3 Oct 2023 15:49:04 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH v1 1/1] PCI: ACPI: Switch to use acpi_evaluate_dsm_typed()

On Mon, Oct 2, 2023 at 3:54 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> 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: Rafael J. Wysocki <rafael@...nel.org>

> ---
>  drivers/pci/pci-acpi.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
> index a05350a4e49c..cf108259aef6 100644
> --- a/drivers/pci/pci-acpi.c
> +++ b/drivers/pci/pci-acpi.c
> @@ -1215,12 +1215,12 @@ void acpi_pci_add_bus(struct pci_bus *bus)
>         if (!pci_is_root_bus(bus))
>                 return;
>
> -       obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3,
> -                               DSM_PCI_POWER_ON_RESET_DELAY, NULL);
> +       obj = acpi_evaluate_dsm_typed(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3,
> +                                     DSM_PCI_POWER_ON_RESET_DELAY, NULL, ACPI_TYPE_INTEGER);
>         if (!obj)
>                 return;
>
> -       if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
> +       if (obj->integer.value == 1) {
>                 bridge = pci_find_host_bridge(bus);
>                 bridge->ignore_reset_delay = 1;
>         }
> @@ -1376,12 +1376,13 @@ static void pci_acpi_optimize_delay(struct pci_dev *pdev,
>         if (bridge->ignore_reset_delay)
>                 pdev->d3cold_delay = 0;
>
> -       obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 3,
> -                               DSM_PCI_DEVICE_READINESS_DURATIONS, NULL);
> +       obj = acpi_evaluate_dsm_typed(handle, &pci_acpi_dsm_guid, 3,
> +                                     DSM_PCI_DEVICE_READINESS_DURATIONS, NULL,
> +                                     ACPI_TYPE_PACKAGE);
>         if (!obj)
>                 return;
>
> -       if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
> +       if (obj->package.count == 5) {
>                 elements = obj->package.elements;
>                 if (elements[0].type == ACPI_TYPE_INTEGER) {
>                         value = (int)elements[0].integer.value / 1000;
> --
> 2.40.0.1.gaa8946217a0b
>