Re: USB Audio problems

[Patrick Shirkey <pshirkey@boosthardware.com>]

Takashi Iwai wrote:
> 
> the current code is surely buggy, because it issues sync unlink
> inside the spinlocked context.  it's problematic on 2.6 kernel or SMP
> system, and may result in kernel oops.  i added async_unlink module
> option to change the behavior in the new version.
> 
> but it's still disabled as default, because unlinking multiple urbs
> asynchronouly on 2.4 kernel causes kernel panic.  sigh.
> unfortunately, there is no perfect solution to satisfy all versions
> yet.  perhaps we need to redesign the linked-pcm streams to make it
> possible to call prepare callback without spinlocks.
> 
>

Ahhh, Finally an explanaiton for why my root /var/ partition is always 
being filled up with usb errors.

Would this also have a detrimental effect on latency? If so then I can 
let other usb-audio user know why.


-- 
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org - The Linux Audio Users guide
========================================

Being on stage with the band in front of crowds shouting, "Get off! No! 
We want normal music!", I think that was more like acting than anything 
I've ever done.

Goldie, 8 Nov, 2002
The Scotsman



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