linux-kernel - Re: [PATCH] gpio: sim: fix uninitialized ret variable

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Date:   Sun, 19 Dec 2021 14:48:38 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     trix@...hat.com
Cc:     Linus Walleij <linus.walleij@...aro.org>, nathan@...nel.org,
        ndesaulniers@...gle.com,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] gpio: sim: fix uninitialized ret variable

On Sat, Dec 18, 2021 at 4:27 PM <trix@...hat.com> wrote:
>
> From: Tom Rix <trix@...hat.com>
>
> Building with clang returns this error:
>
> gpio-sim.c:889:7: error: variable 'ret' is uninitialized
>   when used here
>
> ret should be the status of the call to
> gpio_sim_make_bank_swnode stored in bank->swnode.
>
> Fixes: 83960fcf4818 ("gpio: sim: new testing module")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  drivers/gpio/gpio-sim.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c
> index ef6145f51c8ae..bef00dcc4dc8f 100644
> --- a/drivers/gpio/gpio-sim.c
> +++ b/drivers/gpio/gpio-sim.c
> @@ -886,7 +886,8 @@ static int gpio_sim_device_activate_unlocked(struct gpio_sim_device *dev)
>
>         list_for_each_entry(bank, &dev->bank_list, siblings) {
>                 bank->swnode = gpio_sim_make_bank_swnode(bank, swnode);
> -               if (ret) {
> +               if (IS_ERR(bank->swnode)) {
> +                       ret = PTR_ERR(bank->swnode);
>                         gpio_sim_remove_swnode_recursive(swnode);
>                         return ret;
>                 }
> --
> 2.26.3
>

Applied, thanks!

Bart