TTY: rfcomm/tty, use count from tty_port
This means converting an atomic counter to a counter protected by lock. This is the first step needed to convert the rest of the code to the tty_port helpers. Signed-off-by: NJiri Slaby <jslaby@suse.cz> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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