W1_SLAVE_ACTIVE
clear_bit(W1_SLAVE_ACTIVE, &sl->flags);
if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) {
else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags))
set_bit(W1_SLAVE_ACTIVE, &sl->flags);
set_bit(W1_SLAVE_ACTIVE, &sl->flags);