linux-kernel - Re: [PATCH -next] ACPI: LPSS: Replaced simple

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Date:   Mon, 24 May 2021 16:33:46 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Liu Shixin <liushixin2@...wei.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] ACPI: LPSS: Replaced simple_strtol() with kstrtol()

On Mon, May 24, 2021 at 1:35 PM Liu Shixin <liushixin2@...wei.com> wrote:
>
> The simple_strtol() function is deprecated in some situation since
> it does not check for the range overflow. Use kstrtol() instead.
>
> Signed-off-by: Liu Shixin <liushixin2@...wei.com>
> ---
>  drivers/acpi/acpi_lpss.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
> index ca742f16a507..1b46e00cad3a 100644
> --- a/drivers/acpi/acpi_lpss.c
> +++ b/drivers/acpi/acpi_lpss.c
> @@ -186,13 +186,12 @@ static void byt_i2c_setup(struct lpss_private_data *pdata)
>         long uid = 0;
>
>         /* Expected to always be true, but better safe then sorry */
> -       if (uid_str)
> -               uid = simple_strtol(uid_str, NULL, 10);
> -
> -       /* Detect I2C bus shared with PUNIT and ignore its d3 status */
> -       status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
> -       if (ACPI_SUCCESS(status) && shared_host && uid)
> -               pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1));
> +       if (uid_str && !kstrtol(uid_str, 10, &uid)) {
> +               /* Detect I2C bus shared with PUNIT and ignore its d3 status */
> +               status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
> +               if (ACPI_SUCCESS(status) && shared_host && uid)
> +                       pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1));
> +       }

This is not a simple replacement.

Why are you making the other changes?

>
>         lpss_deassert_reset(pdata);
>
> --