tty: tty_port: Add IO_ERROR bit handling
To propogate tty_port_open/close to a few other devices we need to start handling the IO_ERROR flag on the tty. We can do this pretty trivially. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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