linux-kernel - Re: [PATCH] pinctrl: meson: amlogic-a4: Fix device node reference leak in bank helpers

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Message-ID: <5e95f52c-92d3-426a-b91c-22bdf42dd65c@amlogic.com>
Date: Wed, 28 Jan 2026 10:37:25 +0800
From: Xianwei Zhao <xianwei.zhao@...ogic.com>
To: Felix Gu <ustc.gu@...il.com>, Linus Walleij <linusw@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: linux-amlogic@...ts.infradead.org, linux-gpio@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: meson: amlogic-a4: Fix device node reference
 leak in bank helpers


Reviewed-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
On 2026/1/28 02:23, Felix Gu wrote:
> [You don't often get email from ustc.gu@...il.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> [ EXTERNAL EMAIL ]
> 
> of_parse_phandle_with_fixed_args() increments the reference count of the
> returned device node, so it must be explicitly released using
> of_node_put() after use.
> 
> Fix the reference leak in aml_bank_pins() and aml_bank_number() by
> adding the missing of_node_put() calls.
> 
> Fixes: 6e9be3abb78c ("pinctrl: Add driver support for Amlogic SoCs")
> Signed-off-by: Felix Gu <ustc.gu@...il.com>
> ---
>   drivers/pinctrl/meson/pinctrl-amlogic-a4.c | 10 ++++++----
>   1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pinctrl/meson/pinctrl-amlogic-a4.c b/drivers/pinctrl/meson/pinctrl-amlogic-a4.c
> index ded7b218e2ec..40542edd557e 100644
> --- a/drivers/pinctrl/meson/pinctrl-amlogic-a4.c
> +++ b/drivers/pinctrl/meson/pinctrl-amlogic-a4.c
> @@ -725,8 +725,9 @@ static u32 aml_bank_pins(struct device_node *np)
>          if (of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
>                                               0, &of_args))
>                  return 0;
> -       else
> -               return of_args.args[2];
> +
> +       of_node_put(of_args.np);
> +       return of_args.args[2];
>   }
> 
>   static int aml_bank_number(struct device_node *np)
> @@ -736,8 +737,9 @@ static int aml_bank_number(struct device_node *np)
>          if (of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
>                                               0, &of_args))
>                  return -EINVAL;
> -       else
> -               return of_args.args[1] >> 8;
> +
> +       of_node_put(of_args.np);
> +       return of_args.args[1] >> 8;
>   }
> 
>   static unsigned int aml_count_pins(struct device_node *np)
> 
> ---
> base-commit: 615aad0f61e0c7a898184a394dc895c610100d4f
> change-id: 20260128-amlogic-0d08ef086c8b
> 
> Best regards,
> --
> Felix Gu <ustc.gu@...il.com>
>