linux-kernel - Re: [PATCH v2 04/11] gpiolib: use gpiochip_get_desc() in linehandle

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Date:   Thu, 5 Dec 2019 00:20:13 +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 04/11] gpiolib: use gpiochip_get_desc() in linehandle_create()

On Wed, Dec 4, 2019 at 7:18 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>

Fun fact, I have for longer than a month a similar series, though not
baked well, and never had time to send it up.
Thanks you did this!

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  drivers/gpio/gpiolib.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index b3ffb079e323..6ef55cc1188b 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -678,14 +678,13 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
>         /* Request each GPIO */
>         for (i = 0; i < handlereq.lines; i++) {
>                 u32 offset = handlereq.lineoffsets[i];
> -               struct gpio_desc *desc;
> +               struct gpio_desc *desc = gpiochip_get_desc(gdev->chip, offset);
>
> -               if (offset >= gdev->ngpio) {
> -                       ret = -EINVAL;
> +               if (IS_ERR(desc)) {
> +                       ret = PTR_ERR(desc);
>                         goto out_free_descs;
>                 }
>
> -               desc = &gdev->descs[offset];
>                 ret = gpiod_request(desc, lh->label);
>                 if (ret)
>                         goto out_free_descs;
> --
> 2.23.0
>


-- 
With Best Regards,
Andy Shevchenko