linux-kernel - Re: [PATCH v2 05/11] gpiolib: use gpiochip_get_desc() in lineevent

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Message-ID: <CAHp75VeMY2TRKOmz6WTA+8q2UYu+6sw4Xi_9SiiKur1ND8pMuA@mail.gmail.com>
Date:   Thu, 5 Dec 2019 00:20:50 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 05/11] gpiolib: use gpiochip_get_desc() in lineevent_create()

On Wed, Dec 4, 2019 at 6:05 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> Unduplicate the ngpio check by simply calling gpiochip_get_desc() and
> checking its return value.
>

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  drivers/gpio/gpiolib.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 6ef55cc1188b..17796437d7be 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1009,8 +1009,9 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
>         lflags = eventreq.handleflags;
>         eflags = eventreq.eventflags;
>
> -       if (offset >= gdev->ngpio)
> -               return -EINVAL;
> +       desc = gpiochip_get_desc(gdev->chip, offset);
> +       if (IS_ERR(desc))
> +               return PTR_ERR(desc);
>
>         /* Return an error if a unknown flag is set */
>         if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) ||
> @@ -1048,7 +1049,6 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
>                 }
>         }
>
> -       desc = &gdev->descs[offset];
>         ret = gpiod_request(desc, le->label);
>         if (ret)
>                 goto out_free_label;
> --
> 2.23.0
>


-- 
With Best Regards,
Andy Shevchenko