Are calls to activate/shutdown a port serialized?

[Grant Edwards <grant.b.edwards@xxxxxxxxx>]

I ported an old tty driver to the new tty_port_ helper functions.  And
I'm trying to track down a couple of bugs in the new version of the
driver.

Are calls to the port's activate/shutdown methods serialized (either
globally or per-port)?
    
-- 
Grant Edwards               grant.b.edwards        Yow! My Aunt MAUREEN was a
                                  at               military advisor to IKE &
                              gmail.com            TINA TURNER!!

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