linux-kernel - Re: usb unbind/bind => WARNING at fs/sysfs/dir.c [Was: 2.6.25-rc8-mm1]

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Date:	Fri, 4 Apr 2008 17:23:16 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <greg@...ah.com>
cc:	Jiri Slaby <jirislaby@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: usb unbind/bind => WARNING at fs/sysfs/dir.c [Was: 2.6.25-rc8-mm1]

On Fri, 4 Apr 2008, Greg KH wrote:

> On Fri, Apr 04, 2008 at 10:16:32PM +0200, Jiri Slaby wrote:
> > On 04/02/2008 06:32 AM, Andrew Morton wrote:
> >> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.25-rc8/2.6.25-rc8-mm1/
> >
> > After
> > $ echo -n 4-1.2 >/sys/bus/usb/drivers/usb/unbind
> > $ echo -n 4-1.2 >/sys/bus/usb/drivers/usb/bind
> >
> > I have this in logs:
> >
> > sysfs: duplicate filename 'usbdev4.12_ep81' can not be created
> 
> Does this also show up in 2.6.25-rc8 without -mm?
> 
> I thought I fixed this already, I don't see what slipped into -mm that
> would have caused it to come back.  Time to run some more tests...
> 
> Oh, also note that binding and unbinding the main "usb" driver is not
> encouraged, or even supported.  I'm amazed it works, as this is not
> something that any "real" user would do as it makes no sense at all
> because we have no "alternative" drivers yet for the main USB device.

It's a real bug.  I don't have time to track it down now.  Next week...

Alan Stern

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