linux-kernel - Re: [PATCH v2 06/11] gpiolib: use gpiochip_get_desc() in gpio

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Message-ID: <CAD9cdQ5_P1VdRXz2Jz1=ir1FHoBMgjb5u4MKZ4k2oVNK43q_uQ@mail.gmail.com>
Date:   Wed, 4 Dec 2019 17:25:47 +0100
From:   Rainer Sickinger <rainersickinger.official@...il.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 06/11] gpiolib: use gpiochip_get_desc() in gpio_ioctl()

GREAT WORK

Am Mi., 4. Dez. 2019 um 17:04 Uhr schrieb Bartosz Golaszewski <brgl@...ev.pl>:
>
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> Unduplicate the offset check by simply calling gpiochip_get_desc() and
> checking its return value.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  drivers/gpio/gpiolib.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 17796437d7be..b7043946c029 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1175,10 +1175,11 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>
>                 if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
>                         return -EFAULT;
> -               if (lineinfo.line_offset >= gdev->ngpio)
> -                       return -EINVAL;
>
> -               desc = &gdev->descs[lineinfo.line_offset];
> +               desc = gpiochip_get_desc(chip, lineinfo.line_offset);
> +               if (IS_ERR(desc))
> +                       return PTR_ERR(desc);
> +
>                 if (desc->name) {
>                         strncpy(lineinfo.name, desc->name,
>                                 sizeof(lineinfo.name));
> --
> 2.23.0
>