[Bug 282478] [ipfilter] Silence a lock upon service stop

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282478

Mark Johnston <[email protected]> changed:

           What    |Removed                     |Added
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             Status|New                         |Open
                 CC|                            |[email protected]

--- Comment #1 from Mark Johnston <[email protected]> ---
To fix this, I think it'd be sufficient to:
1. Use callout_init_rw() to initialize ipf_slow_ch, and remove the locking in
ipf_timer_func().
2. Use callout_stop() instead of callout_drain().

This assumes that the global ipf lock is not dropped while executing
ipf_timer_func(), which I believe is the case.  If so, then callout_stop() can
cancel a pending callout without sleeping, avoiding the problem which triggers
that warning.

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