Re: USB Audio problems

[Takashi Iwai <tiwai@suse.de>]

At Thu, 20 Nov 2003 11:04:52 +0100,
Niklas Werner wrote:
> 
> Karim Yaghmour wrote:
> 
> >
> > Well, it seems that I'm going to have to answer my own self ... :)
> 
> Yes, usb-audio seems to be a bit forgotten... (Takashi, those 
> mplayer-plughw-segfaults still persist, even on x86 and even with kernel 
> 2.4 (current cvs of drivers/lib, of course)

not forgotten, but it's difficult to debug.
the problem is the behavior of submit_urb() and unlink_urb() is quite
dependent on the hub module and kernel version.

> >
> > The following is what I've been able to find using additional tracing
> > info. Also there's a fix for usbaudio.c.
> >
> hmmm, the submit_urb-error is gone, but random lockups and 
> usb-device-disconnect until reboot have come... (bitkeeper-2.6 from just 
> one hour ago...) with your function.

try async_unlink option.  it's experimental but better for 2.6.
on 2.4 usb-uhci, it caused oops, though...


Takashi


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