Try the diff below although I suspect much of the extra logic can go
away and something like

        len = 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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