+ list = &q->task_list;
+ seen = 0;
+ retval = -1;
+
+ do {
+ struct list_head *next;
+ if (list == &wait->task_list)
+ seen++;
+ next = list->next;
+ if (next->prev != list) {
+ seen += 2;
+ break;
+ }
+ list = next;
+ } while (list != &q->task_list);
+
+ if (seen == 1) {
+ __remove_wait_queue(q, wait);
+ retval = 0;
+ }