4630 clean stale references to ddi_iopb_alloc and ddi_iopb_free
4634 undocument scsi_hba_attach() and ddi_dma_lim(9s)

@@ -1688,13 +1688,11 @@
 
         un->un_uscsi_rqs_buf = kmem_alloc(SENSE_LENGTH, KM_SLEEP);
 
         /*
          * use i_ddi_mem_alloc() for now until we have an interface to allocate
-         * memory for DMA which doesn't require a DMA handle. ddi_iopb_alloc()
-         * is obsolete and we want more flexibility in controlling the DMA
-         * address constraints.
+         * memory for DMA which doesn't require a DMA handle.
          */
         (void) i_ddi_mem_alloc(devp->sd_dev, &st_alloc_attr,
             sizeof (struct seq_mode), ((km_flags == KM_SLEEP) ? 1 : 0), 0,
             NULL, (caddr_t *)&un->un_mspl, &rlen, NULL);