linux-kernel - Re: [linux-usb-devel] fixing usb-midi device support

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Message-Id: <200711061017.06581.oliver@neukum.org>
Date:	Tue, 6 Nov 2007 10:17:06 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	linux-usb-devel@...ts.sourceforge.net
Cc:	David Griffith <dgriffi@...csubak.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Takashi Iwai <tiwai@...e.de>,
	Clemens Ladisch <clemens@...isch.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Vitaliy Ivanov <vitalivanov@...il.com>,
	Jaroslav Kysela <perex@...e.cz>
Subject: Re: [linux-usb-devel] fixing usb-midi device support

Am Dienstag 06 November 2007 schrieb David Griffith:
> On Mon, 5 Nov 2007, Andrew Morton wrote:
> 
> > On Thu, 1 Nov 2007 10:20:24 -0700 (PDT) David Griffith <dgriffi@...csubak.edu> wrote:
> >
> > > On Thu, 1 Nov 2007, Vitaliy Ivanov wrote:
> >
> > Lots of cc's added.
> >
> > > > David,
> > > >
> > > > On 10/31/07, David Griffith <dgriffi@...csubak.edu> wrote:
> > > > >
> > > > > I have a MOTU Fastlane and an Emu Xmidi 2x2 USB midi interfaces.  The Emu
> > > > > unit works fine with current kernels.  The MOTU unit won't work with
> > > > > kernels newer than 2.6.17.
> >
> > It's a regression.
> 
> > > The oops is still present.  I was hoping that the patch I found and lost
> > > would help me understand what was going on.
> > >
> >
> > Are you able to send a copy of the oops output?
> 
> Yes.
> 
> To refresh everyone, I got this by doing "amidi -d -p virtual" in
> one xterm.  Then I started MIOS Studio
> (http://www.midibox.org/mios_studio/) and patched the internal in port to
> all available out ports including the virtual one just created.  Remove
> the MIDI interface, then quit MIOS Studio.  An oops will immediately
> occur.

You are suffering from the sysfs/usb_set_configuration() issue.
please try this patch:

http://www.mail-archive.com/git-commits-head%40vger.kernel.org/msg28576.html

	Regards
		Oliver
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