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Where's f_audioctx set?

I started to look into the audio setting issue I mentioned here a
couple of weeks ago (thread topic "Audio volume setting: not working -
sometimes?").  (9.1, amd64.)

Right away I ran into something I don't understand.

The implementation of AUDIO_SETINFO calls audio_file_setinfo with,
among other things, a variable called file.  file is passed in from the
caller, which gets it from

	file = fp->f_audioctx;

However, I have completely failed to figure out where f_audioctx is
set.  I find exactly one assignment to f_audioctx in the entire kernel
source tree, that being

	fp->f_audioctx = NULL;

f_audioctx is #defined to f_undata.fd_audioctx, but fd_audioctx occurs
only twice in the whole tree:

	struct audio_file *fd_audioctx;	// DTYPE_MISC (audio)
#define f_audioctx	f_undata.fd_audioctx

However, the KASSERT, combined with AUDIO_SETINFO doing something,
indicates that it clearly is getting set.  So, I'm obviously missing


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