tty: We want the port object to be persistent
Move the tty_port and uart_info bits around a little. By embedding the uart_info into the uart_port we get rid of lots of corner case testing and also get the ability to go port<->state<->info which is a bit more elegant than the current data structures. Downsides - we allocate a tiny bit more memory for unused ports, upside we've removed as much code as it saved for most users.. Signed-off-by:Alan Cox <alan@redhat.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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