[Bug 229106] intr_event_handle is unsafe with respect to interrupt handler list

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229106

--- Comment #2 from Andriy Gapon <avg at FreeBSD.org> ---
Yes, it's an old one.
I think that using a spinlock is perfectly fine.
I also have a work-in-progress that tries to solve the problem with some atomic
magic so that intr_event_handle is completely wait / spin free (if the
interrupt thread does not need to run, of course).  I guess that a difference
between those two approaches would be negligible.

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