Can't unload snd_uaudio: it hangs in D+ state

[Yuri]

On 04/22/2012 22:54, Hans Petter Selasky wrote:
>
> If it says in dmesg that an application is using a device, that is a problem
> with the PCM layer, that doesn't support detach of devices if they are in use.

Other snd_xxx.ko can't be unloaded when in use, ex:
# kldunload snd_es137x.ko
kldunload: can't unload file: Device busy

Something is different with snd_usound.ko

Yuri