[Bug 204298] xpt_release_device() panic: mutex CAM queue lock not owned

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204298

--- Comment #6 from Scott M. Ferris <smferris at gmail.com> ---
Created attachment 162840
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=162840&action=edit
revised patch with a LOR fix and mav's cleanups

I attached a revised patch that tries to fix the LOR and incorporate mav's
cleanups.

The acquire side is handled by taking a device ref for the callout before we
know if we need another ref, and releasing the extra ref if we discover we
don't need it.

The release side is handled using CALLOUT_RETURNUNLOCKED so that the callout
can just unlock devq->send_mtx and then xpt_release_device().

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