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

From: Jonathan Cameron <jic23@kernel.org>
To: Marcus Folkesson <marcus.folkesson@gmail.com>
Cc: Kent Gustavsson <kent@minoris.se>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 02/10] iio: adc: mcp3911: use resource-managed version of iio_device_register
Date: Sat, 25 Jun 2022 12:30:37 +0100	[thread overview]
Message-ID: <20220625123037.0d907e4c@jic23-huawei> (raw)
In-Reply-To: <20220625103853.2470346-2-marcus.folkesson@gmail.com>

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

> Keep using managed resources as much as possible.
> 
> Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.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);