Re: tascam us-122 midi in does not work

[Werner Schweer <ws@seh.de>]

On Tuesday 15 June 2004 01:10, Karsten Wiese wrote:
> Am Sonntag 13 Juni 2004 13:07 schrieb Werner Schweer:
> > Hello,
> >
> > Some strange effect occurs on my tascam us-122 audio/midi usb
> > device:
> >    After starting JACK the midi input does not work anymore. Not even
> > the midi in led on the us-122 flashes. Midi output is always fine.
> > After stopping JACK midi input still does not work. Midi input works
> > again after disconnect/reconnect the usb cable.
> > I'm using current ALSA cvs and kernel 2.6.7rc3.
>
> Didn't try that kernel yet.
>
> To see more, you can change snd_usbmidi_urb_error() in alsa-kernel:141 to
> look like that:
>
> static int snd_usbmidi_urb_error(int status)
> {
> 	snd_printk(KERN_ERR "urb status %d\n", status);
> 	if (status == -ENOENT)
> 		return status; /* killed */
> 	if (status == -EILSEQ ||
> 	    status == -ECONNRESET ||
> 	    status == -ETIMEDOUT)
> 		return -ENODEV; /* device removed/shutdown */
> 	return 0; /* continue */
> }
> <<<<<<
>
> If this shows a status that causes a negativ return value when you start
> jack, change snd_usbmidi_urb_error() further more so it returns 0 in that
> case. that can crash the machine or help......
>
> regards,
> Karsten

In current CVS the function looks like:

/*
 * Error handling for URB completion functions.
 */
static int snd_usbmidi_urb_error(int status)
{
      if (status == -ENOENT)
            return status; /* killed */
      if (status == -EILSEQ ||
          status == -ECONNRESET ||
          status == -ETIMEDOUT)
            return -ENODEV; /* device removed/shutdown */
      snd_printk(KERN_ERR "urb status %d\n", status);
      return 0; /* continue */
}

and after loading jack the logfile has an "urb status" message of -108
(ESHUTDOWN?) followed by a "usb_submit_urb: -32" (EPIPE) message.
From the above code i assume snd_usbmidi_urb_error() returns 0 for
status -108.

Regards,
Werner






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