SCSIPI_CHANT_CALLBACK
if (chan->chan_tflags & SCSIPI_CHANT_CALLBACK) {
chan->chan_tflags &= ~SCSIPI_CHANT_CALLBACK;
if (chan->chan_tflags & SCSIPI_CHANT_CALLBACK) {
chan->chan_tflags |= SCSIPI_CHANT_CALLBACK;