Lines Matching refs:tail
852 * so head == tail can mean empty.1702 u32 head, tail;1725 tail = sc->sr_tail;1726 while (head != tail) {1727 pbuf = &sc->sr[tail].pbuf;1739 tail++;1740 if (tail >= sc->sr_size)1741 tail = 0;1743 sc->sr_tail = tail;1744 /* make sure tail is updated before free */