28     uint32_t head;  member
101     return ring->head == ring->tail;  in desc_ring_empty()
137     ring->head = ring->tail = 0;  in desc_ring_set_size()
236      * head (the empty ring condition).  in ring_pump()
240         while (ring->head != ring->tail) {  in ring_pump()
255     uint32_t head = ring->head;  in desc_ring_set_head()  local
262         DPRINTF("ERROR: trying to set head (%d) past ring[%d] size (%d)\n",  in desc_ring_set_head()
267     if (((head < tail) && ((new >= tail) || (new < head))) ||  in desc_ring_set_head()
268         ((head > tail) && ((new >= tail) && (new < head)))) {  in desc_ring_set_head()
270                 "(head %d, tail %d, new head %d)\n",  in desc_ring_set_head()
271                 ring->index, head, tail, new);  in desc_ring_set_head()
275     if (new == ring->head) {  in desc_ring_set_head()
276         DPRINTF("WARNING: setting head (%d) to current head position\n", new);  in desc_ring_set_head()
279     ring->head = new;  in desc_ring_set_head()
286     return ring->head;  in desc_ring_get_head()
357     ring->head = 0;  in desc_ring_reset()