linux-kernel - Re: [PATCH] gpio: mvebu: fix irq domain leak

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 19 Jul 2023 15:27:52 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy@...nel.org>, linux-pwm@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH] gpio: mvebu: fix irq domain leak

On Wed, Jul 19, 2023 at 3:03 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Wed, Jul 19, 2023 at 2:41 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> >
> > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> >
> > Uwe Kleine-König pointed out we still have one resource leak in the 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@...il.com>
>
> > Fixes: 812d47889a8e ("gpio/mvebu: Use irq_domain_add_linear")
> > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.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 platform_device *pdev,
> >         return 0;
> >  }
> >
> > +static void mvebu_gpio_remove_irq_domain(void *data)
> > +{
> > +       struct irq_domain *domain = 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_device *pdev)
> >                 return -ENODEV;
> >         }
> >
> > +       err = devm_add_action_or_reset(&pdev->dev, mvebu_gpio_remove_irq_domain,
> > +                                      mvchip->domain);
> > +       if (err)
> > +               return err;
> > +
> >         err = 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_device *pdev)
> >         }
> >
> >         return 0;
> > -
> > -err_domain:
> > -       irq_domain_remove(mvchip->domain);
> > -       return err;
> >  }
>
>
> --
> With Best Regards,
> Andy Shevchenko