linux-kernel - Re: [PATCH 1/2]drivers/usb/core/sysfs.c Fix variable 'retval' set but not used

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Date:	Tue, 3 Aug 2010 11:36:45 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Justin P. Mattock" <justinmattock@...il.com>
cc:	Valdis.Kletnieks@...edu, <linux-usb@...r.kernel.org>,
	<dbrownell@...rs.sourceforge.net>, <gregkh@...e.de>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2]drivers/usb/core/sysfs.c Fix variable 'retval' set
 but not used

On Tue, 3 Aug 2010, Justin P. Mattock wrote:

> On 08/03/2010 07:29 AM, Alan Stern wrote:
> > On Tue, 3 Aug 2010 Valdis.Kletnieks@...edu wrote:
> >
> >> On Mon, 02 Aug 2010 21:26:28 PDT, "Justin P. Mattock" said:
> >>> diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
> >>
> >>>   	if (alt->string)
> >>> -		retval = device_create_file(&intf->dev,&dev_attr_interface);
> >>> +		device_create_file(&intf->dev,&dev_attr_interface);
> >>>   	intf->sysfs_files_created = 1;
> >>>   	return 0;
> >
> > Justin, did you try compiling your new code?  Those unused values are
> > there because device_create_file is declared as __must_check.
> >
> 
> I went as far as compiling, once I saw no warning then figured o.k
> I'll send out what I have for feedback then go from there.
> (and just for the record I want to thank those who took the time to go 
> through and give feedback).

It's a little surprising that you didn't get any warning.  I guess you
don't have CONFIG_ENABLE_MUST_CHECK turned on.

Alan Stern

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