serdev: ttyport: release tty lock sooner on open
Release the tty lock once tty-driver open returns to make it clear that it does not protect neither tty->termios or the serport flags. Signed-off-by: NJohan Hovold <johan@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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