st_tape_alert
struct st_tape_alert *ta;
(char)(sizeof (struct st_tape_alert) >> 8),
(char)(sizeof (struct st_tape_alert)),
ta = kmem_zalloc(sizeof (struct st_tape_alert), KM_SLEEP);
com->uscsi_buflen = sizeof (struct st_tape_alert);
kmem_free(ta, sizeof (struct st_tape_alert));