linux-kernel - Re: [PATCH] iio: adc: viperboard: Call platform_set_drvdata before devm_iio_device

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Date:	Sat, 01 Feb 2014 15:46:05 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Johannes Thumshirn <morbidrsa@...il.com>
CC:	Jonathan Cameron <jic23@...nel.org>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Peter Meerwald <pmeerw@...erw.net>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: viperboard: Call platform_set_drvdata before
 devm_iio_device_register

On 02/01/2014 03:39 PM, Johannes Thumshirn wrote:
> Call platform_set_drvdata before devm_iio_device_register to avoid possible
> race condition when accessing driver data.

I don't think the driver data is accessed from within any of the IIO device
callbacks. In fact I don't think it is accessed at all with the latest
conversion to devm_iio_device_register(). So I think the call to
platform_set_drvdata can just be removed.

> 
> Signed-off-by: Johannes Thumshirn <morbidrsa@...il.com>
> ---
>  drivers/iio/adc/viperboard_adc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/viperboard_adc.c b/drivers/iio/adc/viperboard_adc.c
> index d0add8f..7d9bd05 100644
> --- a/drivers/iio/adc/viperboard_adc.c
> +++ b/drivers/iio/adc/viperboard_adc.c
> @@ -133,14 +133,14 @@ static int vprbrd_adc_probe(struct platform_device *pdev)
>  	indio_dev->channels = vprbrd_adc_iio_channels;
>  	indio_dev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels);
>  
> +	platform_set_drvdata(pdev, indio_dev);
> +
>  	ret = devm_iio_device_register(&pdev->dev, indio_dev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "could not register iio (adc)");
>  		return ret;
>  	}
>  
> -	platform_set_drvdata(pdev, indio_dev);
> -
>  	return 0;
>  }
>  
> 

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