linux-kernel - Re: [PATCH] iio: adc: rzg2l_adc: add missing fwnode_handle_put() in rzg2l_adc_parse

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Date:   Wed, 18 May 2022 20:36:58 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Jialin Zhang <zhangjialin11@...wei.com>
Cc:     "Lad, Prabhakar" <prabhakar.mahadev-lad.rj@...renesas.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Biju Das <biju.das.jz@...renesas.com>,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: adc: rzg2l_adc: add missing fwnode_handle_put() in rzg2l_adc_parse_properties()

On Tue, May 17, 2022 at 5:44 AM Jialin Zhang <zhangjialin11@...wei.com> wrote:
>
> fwnode_handle_put() should be used when terminating
> device_for_each_child_node() iteration with break or
> return to prevent stale device node references from
> being left behind.
>
> Fixes: d484c21bacfa ("iio: adc: Add driver for Renesas RZ/G2L A/D converter")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Jialin Zhang <zhangjialin11@...wei.com>
> ---
>  drivers/iio/adc/rzg2l_adc.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Cheers,
Prabhakar

> diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c
> index 7585144b9715..5b09a93fdf34 100644
> --- a/drivers/iio/adc/rzg2l_adc.c
> +++ b/drivers/iio/adc/rzg2l_adc.c
> @@ -334,11 +334,15 @@ static int rzg2l_adc_parse_properties(struct platform_device *pdev, struct rzg2l
>         i = 0;
>         device_for_each_child_node(&pdev->dev, fwnode) {
>                 ret = fwnode_property_read_u32(fwnode, "reg", &channel);
> -               if (ret)
> +               if (ret) {
> +                       fwnode_handle_put(fwnode);
>                         return ret;
> +               }
>
> -               if (channel >= RZG2L_ADC_MAX_CHANNELS)
> +               if (channel >= RZG2L_ADC_MAX_CHANNELS) {
> +                       fwnode_handle_put(fwnode);
>                         return -EINVAL;
> +               }
>
>                 chan_array[i].type = IIO_VOLTAGE;
>                 chan_array[i].indexed = 1;
> --
> 2.25.1
>