[Qemu-devel] device_del fail

[Lying]

Hello everybody, I encounter a error on my vm guest
I remove my device on my guest is failed, following is detail message.
I didn't add my audio device before running my guest, So i add audio with 
"device_add" after running
Then i can use it, so i remove it with "device_del", but when i do it again, i 
can't use my audio device and cannot remove it.