TTY: um/line, use tty from tty_port
This means switching to the tty refcounted model so that we will not race with interrupts. Signed-off-by: NJiri Slaby <jslaby@suse.cz> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: user-mode-linux-devel@lists.sourceforge.net Signed-off-by: NRichard Weinberger <richard@nod.at>
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