Giant? That could be the source of my boot hang. My root filesys is
off of usb, which is also Giant, so if your holding the lock...
Actually have no idea what does that mean yet. HDA driver itself locked
without using Giant, and I don't know where it comes from. May be from
sound subsystem, maybe from somewhere else. All I have done is created
child device pcm0 from hdac0 and it appeared in a such way. Probably I
had to dig deeper into device creation to understand this.