C_SENSE
if (xfer->c_flags & C_SENSE) {
xfer->c_flags |= C_SENSE;
if (!(xfer->c_flags & (C_POLL | C_SENSE | C_MEDIA_ACCESS)) &&
(xfer->c_flags & C_SENSE)) ? WDC_DMA_READ : 0;
if (xfer->c_flags & C_SENSE) {
if (!(xfer->c_flags & C_SENSE)) {
(xfer->c_flags & C_SENSE) != 0);