linux-kernel - Re: [PATCH v8 01/20] gpiolib: cdev: desc_to

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Date:   Tue, 15 Sep 2020 13:08:44 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Kent Gibson <warthog618@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v8 01/20] gpiolib: cdev: desc_to_lineinfo should set info offset

On Wed, Sep 9, 2020 at 1:28 PM Kent Gibson <warthog618@...il.com> wrote:
>
> Set the value of the line info offset in desc_to_lineinfo, rather than

desc_to_lineinfo()

> relying on it being passed in the info.  This makes the function behave
> as you would expect from the name - it generates the line info
> corresponding to a given GPIO desc.

One nit-pick below.
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

>
> Signed-off-by: Kent Gibson <warthog618@...il.com>
> ---
>
> There are some instances where this results in the offset being set when
> it is already set in the info, but this is clearer especially considering
> that, as part of the replacement of strncpy with strscpy and to ensure
> kernel stack cannot be leaked to userspace, the info is initially zeroed
> in a subsequent patch.
>
>  drivers/gpio/gpiolib-cdev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
> index e6c9b78adfc2..e95e3eab9867 100644
> --- a/drivers/gpio/gpiolib-cdev.c
> +++ b/drivers/gpio/gpiolib-cdev.c
> @@ -752,6 +752,7 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
>         bool ok_for_pinctrl;
>         unsigned long flags;
>
> +       info->line_offset = gpio_chip_hwgpio(desc);

+ blank line?

>         /*
>          * This function takes a mutex so we must check this before taking
>          * the spinlock.
> @@ -933,7 +934,6 @@ static int lineinfo_changed_notify(struct notifier_block *nb,
>                 return NOTIFY_DONE;
>
>         memset(&chg, 0, sizeof(chg));
> -       chg.info.line_offset = gpio_chip_hwgpio(desc);
>         chg.event_type = action;
>         chg.timestamp = ktime_get_ns();
>         gpio_desc_to_lineinfo(desc, &chg.info);
> --
> 2.28.0
>


-- 
With Best Regards,
Andy Shevchenko