[Bug 194979] New: uart_intr leads to "bad stray interrupt" under pressure

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194979

            Bug ID: 194979
           Summary: uart_intr leads to "bad stray interrupt" under
                    pressure
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: max.laier at isilon.com

Created attachment 149349
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149349&action=edit
Setup uart_intr() as both filter and hander

Broken by:
https://svnweb.freebsd.org/base?view=revision&revision=253161

With this, uart_intr() can return FILTER_SCHEDULE_THREAD, but we don't setup a
threaded handler, which leads to the panic.

Since the handling in uart_intr() looks MP-safe now, the attached patch should
do the trick.

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