linux-kernel - Re: [PATCH] gpio: rcar: handle pm_runtime_get

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Date:   Tue, 23 Jun 2020 10:50:24 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Navid Emamdoost <emamd001@....edu>,
        Qiushi Wu <wu000273@....edu>, Kangjie Lu <kjlu@....edu>,
        smccaman@....edu
Subject: Re: [PATCH] gpio: rcar: handle pm_runtime_get_sync failure case

pt., 5 cze 2020 o 04:49 Navid Emamdoost <navid.emamdoost@...il.com> napisał(a):
>
> Calling pm_runtime_get_sync increments the counter even in case of
> failure, causing incorrect ref count. Call pm_runtime_put if
> pm_runtime_get_sync fails.
>
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>  drivers/gpio/gpio-rcar.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
> index 7284473c9fe3..eac1582c70da 100644
> --- a/drivers/gpio/gpio-rcar.c
> +++ b/drivers/gpio/gpio-rcar.c
> @@ -250,8 +250,10 @@ static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset)
>         int error;
>
>         error = pm_runtime_get_sync(p->dev);
> -       if (error < 0)
> +       if (error < 0) {
> +               pm_runtime_put(p->dev);
>                 return error;
> +       }
>
>         error = pinctrl_gpio_request(chip->base + offset);
>         if (error)
> --
> 2.17.1
>

Hi Navid!

This doesn't apply to current master. I think the previous version got
applied. Could you please rebase?

Bart