linux-kernel - Re: [PATCH v3 4/6] staging:iio:ad2s90: Move device registration to the end of probe

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Date:   Sun, 4 Nov 2018 16:42:29 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Matheus Tavares <matheus.bernardino@....br>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, kernel-usp@...glegroups.com
Subject: Re: [PATCH v3 4/6] staging:iio:ad2s90: Move device registration to
 the end of probe

On Sat,  3 Nov 2018 19:49:46 -0300
Matheus Tavares <matheus.bernardino@....br> wrote:

> Previously, devm_iio_device_register was being called before the
> spi_setup call and the spi_device's max_speed_hz and mode assignments.
> This could lead to a race condition since the driver was still being
> set up after it was already made ready to use. To fix it, this patch
> moves the device registration to the end of ad2s90_probe.
> 
> Signed-off-by: Matheus Tavares <matheus.bernardino@....br>
Applied.  This is definitely looking more like a 'modern' IIO driver.
All sorts of less than sensible things like this used to be done
when all of us were new to drivers.

Thanks,

Jonathan

> ---
>  drivers/staging/iio/resolver/ad2s90.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/iio/resolver/ad2s90.c b/drivers/staging/iio/resolver/ad2s90.c
> index 54ad85bd9dc6..8f79cccf4814 100644
> --- a/drivers/staging/iio/resolver/ad2s90.c
> +++ b/drivers/staging/iio/resolver/ad2s90.c
> @@ -79,10 +79,6 @@ static int ad2s90_probe(struct spi_device *spi)
>  	indio_dev->num_channels = 1;
>  	indio_dev->name = spi_get_device_id(spi)->name;
>  
> -	ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
> -	if (ret)
> -		return ret;
> -
>  	/* need 600ns between CS and the first falling edge of SCLK */
>  	spi->max_speed_hz = 830000;
>  	spi->mode = SPI_MODE_3;
> @@ -93,7 +89,7 @@ static int ad2s90_probe(struct spi_device *spi)
>  		return ret;
>  	}
>  
> -	return 0;
> +	return devm_iio_device_register(indio_dev->dev.parent, indio_dev);
>  }
>  
>  static const struct spi_device_id ad2s90_id[] = {