linux-kernel - Re: [PATCH] staging: iio: adis16203: Use devm_iio_device

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Date:	Thu, 17 Jul 2014 22:47:09 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Himangi Saraogi <himangi774@...il.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
CC:	julia.lawall@...6.fr
Subject: Re: [PATCH] staging: iio: adis16203: Use devm_iio_device_register

On 07/17/2014 10:40 PM, Himangi Saraogi wrote:
> This patch introduces the use of iio_device_register and does away with
> the call to the corressponding unregister function in the probe and
> remove functions of the driver respectively.
>
> Signed-off-by: Himangi Saraogi <himangi774@...il.com>
> Acked-by: Julia Lawall <julia.lawall@...6.fr>

No, you changed the relative order in which iio_device_unregister() and 
adis_cleanup_buffer_and_trigger() are called, this opens up the way for race 
conditions. Rule of thumb: Don't convert drivers to managed functions if 
this will change the order in which functions will called on device removal.

- Lars

> ---
>   drivers/staging/iio/accel/adis16203_core.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/staging/iio/accel/adis16203_core.c b/drivers/staging/iio/accel/adis16203_core.c
> index 409a28e..5077779 100644
> --- a/drivers/staging/iio/accel/adis16203_core.c
> +++ b/drivers/staging/iio/accel/adis16203_core.c
> @@ -175,7 +175,7 @@ static int adis16203_probe(struct spi_device *spi)
>   	if (ret)
>   		goto error_cleanup_buffer_trigger;
>
> -	ret = iio_device_register(indio_dev);
> +	ret = devm_iio_device_register(&spi->dev, indio_dev);
>   	if (ret)
>   		goto error_cleanup_buffer_trigger;
>
> @@ -191,7 +191,6 @@ static int adis16203_remove(struct spi_device *spi)
>   	struct iio_dev *indio_dev = spi_get_drvdata(spi);
>   	struct adis *st = iio_priv(indio_dev);
>
> -	iio_device_unregister(indio_dev);
>   	adis_cleanup_buffer_and_trigger(st, indio_dev);
>
>   	return 0;
>

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