The last TRB in transfer ring is a LINK type TRB, which shouldn't be accounted as a valid item in IsAsyncIntTrb(). Without this fix, the original algo will bring issue on those URBs whose TRBs crosses the transfer ring. Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Feng Tian <feng.tian@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>