linux-kernel - Re: [PATCH] staging:iio:ad2s1210 fix a leak when device removed

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Message-id: <001401cf6371$3e98cf90$bbca6eb0$%han@samsung.com>
Date:	Tue, 29 Apr 2014 15:07:04 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Jimmy Li' <coder.liss@...il.com>
Cc:	'Jonathan Cameron' <jic23@...nel.org>,
	'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>,
	'Lars-Peter Clausen' <lars@...afoo.de>,
	'Sachin Kamat' <sachin.kamat@...aro.org>,
	'Monam Agarwal' <monamagarwal123@...il.com>,
	linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, 'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH] staging:iio:ad2s1210 fix a leak when device removed

On Tuesday, April 29, 2014 2:56 PM, Jimmy Li wrote:
> 
> Signed-off-by: Jimmy Li <coder.liss@...il.com>
> ---
>  drivers/staging/iio/resolver/ad2s1210.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
> index 7fbaba4..3d6e123 100644
> --- a/drivers/staging/iio/resolver/ad2s1210.c
> +++ b/drivers/staging/iio/resolver/ad2s1210.c
> @@ -716,6 +716,7 @@ static int ad2s1210_remove(struct spi_device *spi)
> 
>  	iio_device_unregister(indio_dev);
>  	ad2s1210_free_gpios(iio_priv(indio_dev));
> +	devm_iio_device_free(&spi->dev, indio_dev);

NAK.

In ad2s1210_probe(),devm_iio_device_alloc() was already used.
So, when ad2s1210_remove() is called, iio_device_free() will
be called automatically. So, the leak never happens.

If you want to know about devm_* functions, please refer 
to the following.

  Documentation/driver-model/devres.txt

Best regards,
Jingoo Han
> 
>  	return 0;
>  }
> --
> 1.7.9.5

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