linux-kernel - Re: [PATCH 1/4] gpio: rcar: Fix missing of_node

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Message-ID: <CA+V-a8ujLRRBDLi+E1UVfq3Kx1Ukr5dLPs=kH=F_RT_-MLN8=Q@mail.gmail.com>
Date: Wed, 5 Mar 2025 21:30:10 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Simon Horman <horms+renesas@...ge.net.au>, 
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH 1/4] gpio: rcar: Fix missing of_node_put() call

On Wed, Mar 5, 2025 at 4:39 PM Fabrizio Castro
<fabrizio.castro.jz@...esas.com> wrote:
>
> of_parse_phandle_with_fixed_args() requires its caller to
> call into of_node_put() on the node pointer from the output
> structure, but such a call is currently missing.
>
> Call into of_node_put() to rectify that.
>
> Fixes: 159f8a0209af ("gpio-rcar: Add DT support")
> Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> ---
>  drivers/gpio/gpio-rcar.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Cheers,
Prabhakar

> diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
> index 2ecee3269a0c..7208739cd2d4 100644
> --- a/drivers/gpio/gpio-rcar.c
> +++ b/drivers/gpio/gpio-rcar.c
> @@ -468,7 +468,12 @@ static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p, unsigned int *npins)
>         p->info = *info;
>
>         ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args);
> -       *npins = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK;
> +       if (ret) {
> +               *npins = RCAR_MAX_GPIO_PER_BANK;
> +       } else {
> +               *npins = args.args[2];
> +               of_node_put(args.np);
> +       }
>
>         if (*npins == 0 || *npins > RCAR_MAX_GPIO_PER_BANK) {
>                 dev_warn(p->dev, "Invalid number of gpio lines %u, using %u\n",
> --
> 2.34.1
>
>