linux-kernel - Re: [lm-sensors] [RFC][PATCH] hwmon:fix sparse warnings + error handling

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Date:	Mon, 21 Aug 2006 20:43:05 -0400
From:	Dmitry Torokhov <dtor@...ightbb.com>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Andrew Morton <akpm@...l.org>, lm-sensors@...sensors.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [lm-sensors] [RFC][PATCH] hwmon:fix sparse warnings + error handling

On Monday 21 August 2006 04:04, Jean Delvare wrote:
> > --- linux-work-clean/drivers/hwmon/w83627hf.c	2006-08-20 22:02:40.000000000 +0200
> > +++ linux-work/drivers/hwmon/w83627hf.c	2006-08-20 22:27:14.000000000 +0200
> > @@ -513,9 +513,21 @@ static DEVICE_ATTR(in0_max, S_IRUGO | S_
> > 
> >  #define device_create_file_in(client, offset) \
> >  do { \
> > -device_create_file(&client->dev, &dev_attr_in##offset##_input); \
> > -device_create_file(&client->dev, &dev_attr_in##offset##_min); \
> > -device_create_file(&client->dev, &dev_attr_in##offset##_max); \
> > +	err = device_create_file(&client->dev, &dev_attr_in##offset##_input); \
> > +	if (err) {\
> > +		hwmon_device_unregister(data->class_dev); \
> > +		return err; \
> > +	} \
> > +	err = device_create_file(&client->dev, &dev_attr_in##offset##_min); \
> > +	if (err) {\
> > +		hwmon_device_unregister(data->class_dev); \
> > +		return err; \
> > +	} \
> > +	err = device_create_file(&client->dev, &dev_attr_in##offset##_max); \
> > +	if (err) {\
> > +		hwmon_device_unregister(data->class_dev); \
> > +		return err; \
> > +	} \
> >  } while (0)
> 
> _Never_ use "return" in a macro. It's way too confusing for whoever will
> read the code later.
>

Also I believe it is good practice to remove created attributes explicitely
instead of relying on sysfs to do the cleanup - I beliee Greg was going to
remove it from sysfs at some point of time... 

-- 
Dmitry
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