linux-kernel - Re: [RFCv2 5/8] [media] si4713: add device tree support

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Date:	Mon, 10 Nov 2014 21:58:14 +0100
From:	Sebastian Reichel <sre@...nel.org>
To:	Sakari Ailus <sakari.ailus@....fi>
Cc:	Hans Verkuil <hans.verkuil@...co.com>, linux-media@...r.kernel.org,
	Tony Lindgren <tony@...mide.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [RFCv2 5/8] [media] si4713: add device tree support

Hi Sakari,

On Tue, Nov 04, 2014 at 11:47:14PM +0200, Sakari Ailus wrote:
> Nice set of patches! Thanks! :-)

Thanks :)

> > [...]
> >  	struct si4713_device *sdev;
> > -	struct si4713_platform_data *pdata = client->dev.platform_data;
> >  	struct v4l2_ctrl_handler *hdl;
> > -	int rval, i;
> > +	struct si4713_platform_data *pdata = client->dev.platform_data;
> > +	struct device_node *np = client->dev.of_node;
> > +	int rval;
> > +
> 
> Why empty line here?
> 
> It's not a bad practice to declare short temporary variables etc. as last.

Fixed in PATCHv3.

> > +	struct radio_si4713_platform_data si4713_pdev_pdata;
> > +	struct platform_device *si4713_pdev;
> >  
> >  	sdev = devm_kzalloc(&client->dev, sizeof(*sdev), GFP_KERNEL);
> >  	if (!sdev) {
> > @@ -1608,8 +1612,31 @@ static int si4713_probe(struct i2c_client *client,
> >  		goto free_ctrls;
> >  	}
> >  
> > +	if ((pdata && pdata->is_platform_device) || np) {
> > +		si4713_pdev = platform_device_alloc("radio-si4713", -1);
> 
> You could declare si4713_pdev here since you're not using it elsewhere.

It has been used in the put_main_pdev jump label at the bottom
outside of the scope and all access will happen out of the scope
after the refactoring you suggested below.

> > +		if (!si4713_pdev)
> > +			goto put_main_pdev;
> > +
> > +		si4713_pdev_pdata.subdev = client;
> > +		rval = platform_device_add_data(si4713_pdev, &si4713_pdev_pdata,
> > +						sizeof(si4713_pdev_pdata));
> > +		if (rval)
> > +			goto put_main_pdev;
> > +
> > +		rval = platform_device_add(si4713_pdev);
> > +		if (rval)
> > +			goto put_main_pdev;
> > +
> > +		sdev->pd = si4713_pdev;
> > +	} else {
> > +		sdev->pd = NULL;
> 
> sdev->pd is NULL already here. You could simply return in if () and
> proceed to create the platform device if need be.

Right. I simplified the code accordingly in PATCHv3.

> Speaking of which --- I wonder if there are other than historical
> reasons to create the platform device. I guess that's out of the scope
> of the set anyway.

I think this was done, so that the usb device can export its own
control functions.

> > [...]
> >
> > +	if (sdev->pd)
> > +		platform_device_unregister(sdev->pd);
> 
> platform_device_unregister() may be safely called with NULL argument.

Ok. Changed in PATCHv3.

> > [...]

-- Sebastian

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