Can we block in USB_ATTACH context ?

[Sebastien B]

Hello,
Can I call functions that will block (ie. waiting for condition variables, 
acquiring MTX_DEF mutexes, ...) inside the USB_ATTACH section of a driver ?
Or should I use a software interrupt handler that will perform the 
initialization of my USB device instead of doing this directly in 
USB_ATTACH ? (Lots of transfers have to be made before the device is ready... 
setting up the NET2280 PCI bridge, uploading a ~30kbyte firmware, reading 
configuration options of the device...)
Thanks,
Sebastien