linux-kernel - Re: [PATCH 2/2] iio: ti_am335x_adc: Add continuous sampling support

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Date:	Wed, 18 Sep 2013 11:54:07 +0500
From:	"Zubair Lutfullah :" <zubair.lutfullah@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Zubair Lutfullah <zubair.lutfullah@...il.com>, jic23@....ac.uk,
	linux-iio@...r.kernel.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, bigeasy@...utronix.de,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH 2/2] iio: ti_am335x_adc: Add continuous sampling support

On Tue, Sep 17, 2013 at 09:27:27PM -0700, Dmitry Torokhov wrote:
> Hi Zubair,
> 
> On Tue, Sep 17, 2013 at 09:44:07AM +0500, Zubair Lutfullah wrote:
> > +
> > +	ret = devm_request_threaded_irq(indio_dev->dev.parent,
> > +				irq,
> > +				pollfunc_th, pollfunc_bh,
> > +				flags, indio_dev->name,
> > +				indio_dev);
> > +	if (ret)
> > +		goto error_kfifo_free;
> > +
> > +	indio_dev->setup_ops = setup_ops;
> > +	indio_dev->modes |= INDIO_BUFFER_HARDWARE;
> > +
> > +	ret = iio_buffer_register(indio_dev,
> > +				  indio_dev->channels,
> > +				  indio_dev->num_channels);
> > +	if (ret)
> > +		goto error_free_irq;
> > +
> > +	return 0;
> > +
> > +error_free_irq:
> > +	devm_free_irq(indio_dev->dev.parent, irq, indio_dev);
> 
> What is the point of using devm_* here if you are doing explicit
> management of the resource anyway (you explicitly release it in all code
> paths)?
> 
> Thanks.
> 
> -- 
> Dmitry

I admit I am unaware at the moment about how it works.

I use devm and simply ignore the error path?

The devm function header description said something about using
devm_free when freeing. And this is the way I am used to seeing 
error handling.

Zubair
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