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Message-ID: <CAMRc=Mcvun8A_R0aQmyvNz1DsvX4O-1quQ4Zqcns9GACoxs+tQ@mail.gmail.com>
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
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