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

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Date:   Sat, 18 Dec 2021 14:59:48 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     trix@...hat.com
Cc:     linus.walleij@...aro.org, brgl@...ev.pl, ndesaulniers@...gle.com,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] gpio: sim: fix uninitialized ret variable

On Sat, Dec 18, 2021 at 07:27:12AM -0800, 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>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>  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
>