linux-kernel - Re: [PATCH] iio: adc: ti-ads131e08: add missing fwnode_handle_put() in ads131e08_alloc

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Date:   Sun, 22 May 2022 12:32:25 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Jialin Zhang <zhangjialin11@...wei.com>
Cc:     <tomislav.denis@....com>, <lars@...afoo.de>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: adc: ti-ads131e08: add missing fwnode_handle_put()
 in ads131e08_alloc_channels()

On Tue, 17 May 2022 11:30:20 +0800
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.
This one seems obviously correct so I'll not wait on anyone else
looking at it - still time though as I won't be sending a pull
request until these have been in next for a day or two.

Applied to the fixes-togreg branch of iio.git.

I rewrapped the description to use longer lines.

Jonathan

> 
> Fixes: d935eddd2799 ("iio: adc: Add driver for Texas Instruments ADS131E0x ADC family")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Jialin Zhang <zhangjialin11@...wei.com>
> ---
>  drivers/iio/adc/ti-ads131e08.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/adc/ti-ads131e08.c b/drivers/iio/adc/ti-ads131e08.c
> index 0c2025a22575..80a09817c119 100644
> --- a/drivers/iio/adc/ti-ads131e08.c
> +++ b/drivers/iio/adc/ti-ads131e08.c
> @@ -739,7 +739,7 @@ static int ads131e08_alloc_channels(struct iio_dev *indio_dev)
>  	device_for_each_child_node(dev, node) {
>  		ret = fwnode_property_read_u32(node, "reg", &channel);
>  		if (ret)
> -			return ret;
> +			goto err_child_out;
>  
>  		ret = fwnode_property_read_u32(node, "ti,gain", &tmp);
>  		if (ret) {
> @@ -747,7 +747,7 @@ static int ads131e08_alloc_channels(struct iio_dev *indio_dev)
>  		} else {
>  			ret = ads131e08_pga_gain_to_field_value(st, tmp);
>  			if (ret < 0)
> -				return ret;
> +				goto err_child_out;
>  
>  			channel_config[i].pga_gain = tmp;
>  		}
> @@ -758,7 +758,7 @@ static int ads131e08_alloc_channels(struct iio_dev *indio_dev)
>  		} else {
>  			ret = ads131e08_validate_channel_mux(st, tmp);
>  			if (ret)
> -				return ret;
> +				goto err_child_out;
>  
>  			channel_config[i].mux = tmp;
>  		}
> @@ -784,6 +784,10 @@ static int ads131e08_alloc_channels(struct iio_dev *indio_dev)
>  	st->channel_config = channel_config;
>  
>  	return 0;
> +
> +err_child_out:
> +	fwnode_handle_put(node);
> +	return ret;
>  }
>  
>  static void ads131e08_regulator_disable(void *data)