linux-kernel - Re: [PATCH v11 2/6] backlight: Add support Skyworks SKY81452 backlight driver

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Date:	Fri, 27 Feb 2015 18:03:45 +0900
From:	Gyungoh Yoo <gyungoh@...il.com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	sameo@...ux.intel.com, lee.jones@...aro.org, robh+dt@...nel.org,
	jg1.han@...sung.com, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	trivial@...nel.org, broonie@...nel.org, florian.vaussard@...l.ch,
	andrew@...n.ch, antonynpavlov@...il.com, hytszk@...il.com,
	plagnioj@...osoft.com, tomi.valkeinen@...com,
	jack.yoo@...worksinc.com, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	treding@...dia.com, p.zabel@...gutronix.de, arno@...isbad.org,
	kuninori.morimoto.gx@...esas.com
Subject: Re: [PATCH v11 2/6] backlight: Add support Skyworks SKY81452
 backlight driver

On Fri, Feb 27, 2015 at 09:58:38AM +0100, Oliver Neukum wrote:
> On Fri, 2015-02-27 at 15:42 +0900, gyungoh@...il.com wrote:
> > +static ssize_t sky81452_bl_store_enable(struct device *dev,
> > +               struct device_attribute *attr, const char *buf, size_t
> > count)
> > +{
> > +       struct regmap *regmap = bl_get_data(to_backlight_device(dev));
> > +       unsigned long value;
> > +       int ret;
> > +
> > +       ret = kstrtoul(buf, 16, &value);
> > +       if (IS_ERR_VALUE(ret))
> > +               return ret;
> 
> No range checking?

It doesn't need it. below regmap_update_bits() is masking the value.

> 
> > +
> > +       ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
> > +                                       value << CTZ(SKY81452_EN));
> > +       if (IS_ERR_VALUE(ret))
> > +               return ret;
> > +
> > +       return count;
> > +}
> 
> 	Regards
> 		Oliver
> 
> 
> 
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