find_prev_entry
e = find_prev_entry(qp, psn, &prev, &mra, &old_req);
struct rvt_ack_entry *find_prev_entry(struct rvt_qp *qp, u32 psn, u8 *prev,
e = find_prev_entry(qp, psn, &prev, NULL, &old_req);
prev_st = in_callback_fn ? find_prev_entry(env, state, *insn_idx) : NULL;
prev_st = find_prev_entry(env, cur_st->parent, idx);
prev_st = find_prev_entry(env, cur_st->parent, insn_idx);