linux-kernel - Re: [PATCH v2] Revert "ACPI / resources: Use AE_CTRL

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Date:   Mon, 7 Dec 2020 14:03:39 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Daniel Scally <djrscally@...il.com>
Cc:     ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Len Brown <lenb@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v2] Revert "ACPI / resources: Use AE_CTRL_TERMINATE to
 terminate resources walks"

On Sat, Dec 5, 2020 at 7:42 PM Daniel Scally <djrscally@...il.com> wrote:
>
> This reverts commit 8a66790b7850a6669129af078768a1d42076a0ef.
>
> Switching this function to AE_CTRL_TERMINATE broke the documented
> behaviour of acpi_dev_get_resources() - AE_CTRL_TERMINATE does not, in
> fact, terminate the resource walk because acpi_walk_resource_buffer()
> ignores it (specifically converting it to AE_OK), referring to that
> value as "an OK termination by the user function". This means that
> acpi_dev_get_resources() does not abort processing when the preproc
> function returns a negative value.
>
> Signed-off-by: Daniel Scally <djrscally@...il.com>
> ---
>  drivers/acpi/resource.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index ad04824ca3ba..f2f5f1dc7c61 100644
> --- a/drivers/acpi/resource.c
> +++ b/drivers/acpi/resource.c
> @@ -541,7 +541,7 @@ static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
>                 ret = c->preproc(ares, c->preproc_data);
>                 if (ret < 0) {
>                         c->error = ret;
> -                       return AE_CTRL_TERMINATE;
> +                       return AE_ABORT_METHOD;
>                 } else if (ret > 0) {
>                         return AE_OK;
>                 }
> --

Applied as 5.11 material, thanks!