linux-kernel - Re: [PATCH v4 3/3] touchscreen: colibri-vf50-ts: Add touchscreen support for Colibri VF50

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Date:	Sun, 23 Aug 2015 21:01:48 +0530
From:	maitysanchayan@...il.com
To:	Stefan Agner <stefan@...er.ch>
Cc:	dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
	devicetree@...r.kernel.org, shawnguo@...nel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 3/3] touchscreen: colibri-vf50-ts: Add touchscreen
 support for Colibri VF50

On 15-08-22 18:52:28, Stefan Agner wrote:
> Hi Sanchayan,
> 
> On 2015-08-21 06:26, Sanchayan Maity wrote:
> > +static int vf50_ts_probe(struct platform_device *pdev)
> > +{
> > +	struct input_dev *input;
> > +	struct iio_channel *channels;
> > +	struct device *dev = &pdev->dev;
> > +	struct vf50_touch_device *touchdev;
> > +	int error;
> > +
> > +	channels = iio_channel_get_all(dev);
> > +	if (IS_ERR(channels))
> > +		return PTR_ERR(channels);
> 
> Hm, we expect here that four channels are returned, however a faulty
> device tree could contain less. Access to the fourth channel above would
> lead to a bug.
> 
> Can you check the amount of channels returned? The returned list is
> explicitly terminated with a null entry, you can rely on that. Something
> similar to hwmon should do the job.
> http://lxr.free-electrons.com/source/drivers/hwmon/iio_hwmon.c#L86

I agree. It did be nice to have this error check. Thanks. I will add
this check so we can bail out if less channels are specified.

- Sanchayan.

> 
> 
> Otherwise, Acked-by: Stefan Agner <stefan@...er.ch>
> 
> --
> Stefan
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