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From:   Bartosz Golaszewski <brgl@bgdev.pl>
Date:   Wed, 19 Jul 2023 15:27:52 +0200
Message-ID: <CAMRc=MdxY0s347g36jjvPc_HC-LtJyhNbycF3ZmtUwe1AZywpQ@mail.gmail.com>
Subject: Re: [PATCH] gpio: mvebu: fix irq domain leak
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     Thierry Reding <thierry.reding@gmail.com>,
        =?UTF-8?Q?Uwe_Kleine=2DK=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>,
        Linus Walleij <linus.walleij@linaro.org>,
        Andy Shevchenko <andy@kernel.org>, linux-pwm@vger.kernel.org,
        linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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On Wed, Jul 19, 2023 at 3:03=E2=80=AFPM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Wed, Jul 19, 2023 at 2:41=E2=80=AFPM Bartosz Golaszewski <brgl@bgdev.p=
l> wrote:
> >
> > From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> >
> > Uwe Kleine-K=C3=B6nig pointed out we still have one resource leak in th=
e mvebu
> > driver triggered on driver detach. Let's address it with a custom devm
> > action.
>
> One nit-pick below, in either case
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
>
> > Fixes: 812d47889a8e ("gpio/mvebu: Use irq_domain_add_linear")
> > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> > ---
> >  drivers/gpio/gpio-mvebu.c | 18 +++++++++++++-----
> >  1 file changed, 13 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
> > index a35958e7adf6..67497116ce27 100644
> > --- a/drivers/gpio/gpio-mvebu.c
> > +++ b/drivers/gpio/gpio-mvebu.c
> > @@ -1112,6 +1112,13 @@ static int mvebu_gpio_probe_syscon(struct platfo=
rm_device *pdev,
> >         return 0;
> >  }
> >
> > +static void mvebu_gpio_remove_irq_domain(void *data)
> > +{
> > +       struct irq_domain *domain =3D data;
> > +
> > +       irq_domain_remove(domain);
>
> The from/to void * doesn't need an explicit casting in C. This can be
> a one liner
>

I know but I prioritise readability over brevity. I prefer this version.

Bart

> static void mvebu_gpio_remove_irq_domain(void *domain)
> {
>       irq_domain_remove(domain);
> }
>
> > +}
> > +
> >  static int mvebu_gpio_probe(struct platform_device *pdev)
> >  {
> >         struct mvebu_gpio_chip *mvchip;
> > @@ -1246,13 +1253,18 @@ static int mvebu_gpio_probe(struct platform_dev=
ice *pdev)
> >                 return -ENODEV;
> >         }
> >
> > +       err =3D devm_add_action_or_reset(&pdev->dev, mvebu_gpio_remove_=
irq_domain,
> > +                                      mvchip->domain);
> > +       if (err)
> > +               return err;
> > +
> >         err =3D irq_alloc_domain_generic_chips(
> >             mvchip->domain, ngpios, 2, np->name, handle_level_irq,
> >             IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_LEVEL, 0, 0);
> >         if (err) {
> >                 dev_err(&pdev->dev, "couldn't allocate irq chips %s (DT=
).\n",
> >                         mvchip->chip.label);
> > -               goto err_domain;
> > +               return err;
> >         }
> >
> >         /*
> > @@ -1292,10 +1304,6 @@ static int mvebu_gpio_probe(struct platform_devi=
ce *pdev)
> >         }
> >
> >         return 0;
> > -
> > -err_domain:
> > -       irq_domain_remove(mvchip->domain);
> > -       return err;
> >  }
>
>
> --
> With Best Regards,
> Andy Shevchenko