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

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Message-ID: <20140429062950.GA24666@gmail.com>
Date:	Tue, 29 Apr 2014 14:29:50 +0800
From:	Jimmy Li <coder.liss@...il.com>
To:	Jingoo Han <jg1.han@...sung.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
Subject: Re: [PATCH] staging:iio:ad2s1210 fix a leak when device removed

On Tue, Apr 29, 2014 at 03:07:04PM +0900, Jingoo Han wrote:
> 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

Thank you for your reply,

I understand it now, just ignore this patch.

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