linux-kernel - Re: [PATCH 1/1] hwmon: (iio_hwmon) use dev_err

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Date:   Tue, 31 Jan 2023 07:05:02 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alexander Stein <alexander.stein@...tq-group.com>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] hwmon: (iio_hwmon) use dev_err_probe

On Tue, Jan 31, 2023 at 11:33:59AM +0100, Alexander Stein wrote:
> Instead of just returning an error code, add an error message as well.
> While at it, simplify the code and use a common return path.
> Upon deferral this also nicely lists the following message in
> /sys/kernel/debug/devices_deferred:
> adc     iio_hwmon: Failed to get channels
> 
> Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>

Applied to hwmon-next.

Thanks,
Guenter

> ---
>  drivers/hwmon/iio_hwmon.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c
> index 3aa40893fc09..4c8a80847891 100644
> --- a/drivers/hwmon/iio_hwmon.c
> +++ b/drivers/hwmon/iio_hwmon.c
> @@ -77,9 +77,11 @@ static int iio_hwmon_probe(struct platform_device *pdev)
>  
>  	channels = devm_iio_channel_get_all(dev);
>  	if (IS_ERR(channels)) {
> -		if (PTR_ERR(channels) == -ENODEV)
> -			return -EPROBE_DEFER;
> -		return PTR_ERR(channels);
> +		ret = PTR_ERR(channels);
> +		if (ret == -ENODEV)
> +			ret = -EPROBE_DEFER;
> +		return dev_err_probe(dev, ret,
> +				     "Failed to get channels\n");
>  	}
>  
>  	st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);