linux-kernel - Re: [PATCH] ACPI / OSL: Fix a regression by returning table size via acpi_get_table_with

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Date:   Fri, 9 Dec 2016 04:48:53 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Lv Zheng <lv.zheng@...el.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH] ACPI / OSL: Fix a regression by returning table size via acpi_get_table_with_size()

On Fri, Dec 9, 2016 at 3:21 AM, Lv Zheng <lv.zheng@...el.com> wrote:
> The returned size is still used by the drivers.
>
> Reported-by: Dan Williams <dan.j.williams@...el.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Lv Zheng <lv.zheng@...el.com>
> ---
>  drivers/acpi/osl.c |    8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index 5bef0f65..adf1ec4 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -445,8 +445,12 @@ void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
>
>         status = acpi_get_table(signature, instance, out_table);
>         if (ACPI_SUCCESS(status)) {
> -               /* No longer used by early_acpi_os_unmap_memory() */
> -               *tbl_size = 0;
> +               /*
> +                * No longer used by early_acpi_os_unmap_memory(), but still
> +                * used by the ACPI table drivers.
> +                */
> +               if (*out_table)
> +                       *tbl_size = (*out_table)->length;
>         }
>
>         return (status);
> --

The changelog doesn't explain anything.  Please say (a) what the
problem is and (b) how it is being addressed by your patch.

Thanks,
Rafael