MTX_DEF versus MTX_SPIN

[Rick Macklem]

> 
> > Is there any documentation on best practices for writing a FreeBSD
> > driver?
> 
> Not really. :-/
> 
Just a dumb obvious suggestion. Imho, there is no better doc. than some
well written code, so maybe someone familiar with the drivers can suggest
one (or two) that they consider well written and use the current conventions
as "examples"?

rick, who never trusts documentation anyhow;-)