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d7a3a68019
TTY layer does nothing if tty_ldisc_ops::write_wakeup is NULL, so there is no need to implement an empty one in cx20442. Drop it. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20210722115141.516-1-jslaby@suse.cz Signed-off-by: Mark Brown <broonie@kernel.org>