linux-kernel - Re: [PATCH v2] gpio: tqmx86: fix uninitialized variable girq

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Date:   Wed, 21 Sep 2022 09:31:44 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Dongliang Mu <dzm91@...t.edu.cn>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Dongliang Mu <mudongliangabcd@...il.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] gpio: tqmx86: fix uninitialized variable girq

On Mon, Sep 19, 2022 at 5:14 AM Dongliang Mu <dzm91@...t.edu.cn> wrote:
>
> From: Dongliang Mu <mudongliangabcd@...il.com>
>
> The commit 924610607f19 ("gpio: tpmx86: Move PM device over to
> irq domain") adds a dereference of girq that may be uninitialized.
>
> Fix this by moving irq_domain_set_pm_device into if true branch
> as suggested by Marc Zyngier.
>
> Fixes: 924610607f19 ("gpio: tpmx86: Move PM device over to irq domain")
> Suggested-by: Marc Zyngier <maz@...nel.org>
> Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
> ---
> v1->v2: modify fix method to moving irq_domain_set_pm_device into
> if true branch as suggested by Marc Zyngier
>  drivers/gpio/gpio-tqmx86.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpio-tqmx86.c b/drivers/gpio/gpio-tqmx86.c
> index fa4bc7481f9a..e739dcea61b2 100644
> --- a/drivers/gpio/gpio-tqmx86.c
> +++ b/drivers/gpio/gpio-tqmx86.c
> @@ -307,6 +307,8 @@ static int tqmx86_gpio_probe(struct platform_device *pdev)
>                 girq->default_type = IRQ_TYPE_NONE;
>                 girq->handler = handle_simple_irq;
>                 girq->init_valid_mask = tqmx86_init_irq_valid_mask;
> +
> +               irq_domain_set_pm_device(girq->domain, dev);
>         }
>
>         ret = devm_gpiochip_add_data(dev, chip, gpio);
> @@ -315,8 +317,6 @@ static int tqmx86_gpio_probe(struct platform_device *pdev)
>                 goto out_pm_dis;
>         }
>
> -       irq_domain_set_pm_device(girq->domain, dev);
> -
>         dev_info(dev, "GPIO functionality initialized with %d pins\n",
>                  chip->ngpio);
>
> --
> 2.35.1
>

Applied, thanks!

Bart