linux-kernel - Re: CodingStyle

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Message-ID: <20130418134145.GB2767@roeck-us.net>
Date:	Thu, 18 Apr 2013 06:41:45 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	"Opensource [Anthony Olech]" <anthony.olech.opensource@...semi.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: CodingStyle

On Thu, Apr 18, 2013 at 10:48:06AM +0000, Opensource [Anthony Olech] wrote:
> > -----Original Message-----
> > From: Guenter Roeck [mailto:linux@...ck-us.net]
> > Sent: 18 April 2013 05:14
> > To: Opensource [Anthony Olech]
> > Cc: Jean Delvare; Mark Brown; Randy Dunlap; lm-sensors@...sensors.org;
> > LKML; David Dajun Chen
> > Subject: Re: [NEW DRIVER V5 6/7] drivers/hwmon: DA9058 HWMON driver
> > 
> [...]
> > > +	if (cell == NULL) {
> > > +		ret = -ENODEV;
> > > +		goto exit;
> > 
> > Just return -ENODEV is good enough here. See CodingStyle, chapter 7.
> > 
> [...]
> > > +exit:
> > > +	return ret;
> > > +}
> [...]
> 
> Hi Guenter,
> 
> I have read CodingStyle, chapter 7 and it seems to encourage a single exit point from functions.
> 
Yes, unless you can return directly. There is even an example.
It actually says "... and some common work such as cleanup has to be done".

> During development there was some logging done at the (single) exit point but that has been stripped out for submission.
> Whilst I can duplicate the logging and do an immediate 'return' at all those points, I am hesitant to do so when chapter 7 of the CodingStyle appears to say to use a single exit point. In addition I had thought that a single exit point from functions was a good thing.
> 
Not if you add a goto to a return statement. That defeats the purpose
of easy readability.

Guenter
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