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 08:46:15 -0700
From:	Greg KH <gregkh@...e.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Valdis.Kletnieks@...edu,
	"Justin P. Mattock" <justinmattock@...il.com>,
	linux-usb@...r.kernel.org, dbrownell@...rs.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2]drivers/usb/core/sysfs.c Fix variable 'retval' set
 but not used

On Tue, Aug 03, 2010 at 11:34:26AM -0400, Alan Stern wrote:
> On Tue, 3 Aug 2010 Valdis.Kletnieks@...edu wrote:
> 
> > > 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.
> > 
> > Then why the __must_check attribute if it's usually ignorable? I thought
> > that was reserved for functions that you damned sight better well check
> > for errors because bad things are afoot otherwise?
> 
> That's a good question.  Perhaps Greg KH knows the answer.

You should check the return value for that function.  To not do that is
a bug.  This one looks like it snuck through.  Fixing it properly is the
correct thing to do.

thanks,

greg k-h
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