sound module unload panic

[Tomas Pluskal]

Hello,

I'm using 5-STABLE and it panics when I try to unload the sound module 
(for Sound Blaster PCI 128).

# kldunload es_137x.ko
pcm0: unregister: mixer busy
kldunload: can't unload file: Device busy


when I do that once more:

# kldunload es_137x.ko
WARNING: Driver mistake: destroy_dev on 30/3
panic: don't do that


My complete dmesg is here: http://plusik.pohoda.cz/dmesg

Tomas