sbbc_mbox_t
master_mbox->mbox_in = kmem_zalloc(sizeof (sbbc_mbox_t), KM_NOSLEEP);
master_mbox->mbox_out = kmem_zalloc(sizeof (sbbc_mbox_t), KM_NOSLEEP);
kmem_free(master_mbox->mbox_in, sizeof (sbbc_mbox_t));
kmem_free(master_mbox->mbox_out, sizeof (sbbc_mbox_t));
sbbc_mbox_t *mbox_in;
sbbc_mbox_t *mbox_out;