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There is no need to provide any hook in struct tty_ldisc_ops. Document that and write down that read/write return EIO in that case. The rest is simply ignored. Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20230810091510.13006-3-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>