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The ACM_READY() macro doesn't seem to do anything useful, and it may prevent tty_wait_until_sent() from working properly when called from close. Previously, acm_tty_chars_in_buffer() returned 0 whenever acm->port.count was 0. This means close() could return before all the data has actually been written. Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>