spinwait_unbusy
return spinwait_unbusy(l, n, 1000, NULL);
if (spinwait_unbusy(l, n, 1000, NULL) == 0)
spinwait_unbusy(l, n, 1000, NULL);
if (spinwait_unbusy(l, n, 1000, &err) == 0) {
int spinwait_unbusy(struct dkdev_ata *, int, int, const char **);