linux-kernel - Re: [PATCH 6/8]i2c:i2c_core Fix warning: variable 'dummy' set but not used

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Date:	Wed, 16 Jun 2010 11:45:17 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	David Daney <david.s.daney@...il.com>,
	"Justin P. Mattock" <justinmattock@...il.com>,
	linux-kernel@...r.kernel.org, reiserfs-devel@...r.kernel.org,
	linux-bluetooth@...r.kernel.org, clemens@...isch.de,
	debora@...ux.vnet.ibm.com, dri-devel@...ts.freedesktop.org,
	linux-i2c@...r.kernel.org, linux1394-devel@...ts.sourceforge.net,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 6/8]i2c:i2c_core Fix warning: variable 'dummy' set but 
  not used

On Tue, 15 Jun 2010 09:20:39 -0700, David Daney wrote:
> On 06/15/2010 04:40 AM, Jean Delvare wrote:
> > __process_new_adapter() calls i2c_do_add_adapter() which always returns
> > 0. Why should I check the return value of bus_for_each_drv() when I
> > know it will always be 0 by construction?
> >
> > Also note that the same function is also called through
> > bus_for_each_dev() somewhere else in i2c-core, and there is no warning
> > there because bus_for_each_dev() is not marked __must_check. How
> > consistent is this? If bus_for_each_dev() is OK without __must_check,
> > then I can't see why bus_for_each_drv() wouldn't be.
> 
> Well, I would advocate removing the __must_check then.

I have just sent a patch to LKML doing exactly this.

-- 
Jean Delvare
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