linux-kernel - Re: [PATCH v2 02/10] iio: adc: mcp3911: use resource-managed version of iio_device

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Date:   Sat, 25 Jun 2022 12:30:37 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Marcus Folkesson <marcus.folkesson@...il.com>
Cc:     Kent Gustavsson <kent@...oris.se>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 02/10] iio: adc: mcp3911: use resource-managed
 version of iio_device_register

On Sat, 25 Jun 2022 12:38:45 +0200
Marcus Folkesson <marcus.folkesson@...il.com> wrote:

> Keep using managed resources as much as possible.
> 
> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
See explanation on why this is wrong sent to the v1 version of this patch.

It's a fiddly and not always well understood area (here be dragons!).

Jonathan

> ---
> 
> Notes:
>     v2:
>         - No changes
> 
>  drivers/iio/adc/mcp3911.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/adc/mcp3911.c b/drivers/iio/adc/mcp3911.c
> index c5a0f19d7834..25a235cce56c 100644
> --- a/drivers/iio/adc/mcp3911.c
> +++ b/drivers/iio/adc/mcp3911.c
> @@ -312,7 +312,7 @@ static int mcp3911_probe(struct spi_device *spi)
>  
>  	mutex_init(&adc->lock);
>  
> -	ret = iio_device_register(indio_dev);
> +	ret = devm_iio_device_register(&adc->spi->dev, indio_dev);
>  	if (ret)
>  		goto clk_disable;
>  
> @@ -332,8 +332,6 @@ static void mcp3911_remove(struct spi_device *spi)
>  	struct iio_dev *indio_dev = spi_get_drvdata(spi);
>  	struct mcp3911 *adc = iio_priv(indio_dev);
>  
> -	iio_device_unregister(indio_dev);
> -
>  	clk_disable_unprepare(adc->clki);
>  	if (adc->vref)
>  		regulator_disable(adc->vref);