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

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Message-ID: <4C582B2B.3080804@gmail.com>
Date:	Tue, 03 Aug 2010 07:43:55 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
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 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).


>> What should the code do if device_create_file() manages to fail? Yes, ignoring
>> the return value is one option, but is it the best one?  'return ret;' might be
>> another one. Somebody who understands this code and has more caffeine than me
>> should look this over.
>
> Failure to create a file in sysfs is almost never fatal and usually not
> even dangerous.  Ignoring the error is generally better than failing
> the entire operation.
>
> Alan Stern
>
>

ahh.. you made this more clear for me.. cool thanks!

Justin P. Mattock
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