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 13:09:31 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <gregkh@...e.de>
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, 3 Aug 2010, Greg KH wrote:

> 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.

In other words, usb_set_configuration() should fail if 
usb_create_sysfs_intf_files() is unable to create the attribute file 
containing an interface's string descriptor?

And likewise, ehci_run() should fail if the "companion" and debugging 
files can't be created?

Alan Stern

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