BMU_ST_BUF
if ((rbctrl & BMU_STF) != ((rbctrl & BMU_ST_BUF) <<5)) {
while (rx_used && !(r->rxd_rbctrl & cpu_to_le32(BMU_ST_BUF))) {
!(r->rxd_rbctrl & cpu_to_le32(BMU_ST_BUF))) {