Try the diff below although I suspect much of the extra logic can go away and something likelen = tty_buffer_request_root(tty, HVCS_BUFF_LEN); if(len) { len = hvc_get_chars(...., len); tty_insert_flip_string(tty, buf, len); } is better.
It's like whack a mole. 30 more now in drivers/serial/jsm/jsm_tty.c and drivers/serial/icom.c
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