fix aic7xxx highmem bouncing

- add extra pci_set_dma_mask
- remove unnecessary #ifdef CONFIG_HIGHIO left over from 2.4

drivers/scsi/aic7xxx/aic7xxx_osm.c

@@ -1297,7 +1297,6 @@ Scsi_Host_Template aic7xxx_driver_template = {
 	 */
 	.max_sectors		= 8192,
 #endif
-#if defined CONFIG_HIGHIO
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,18)
 /* Assume RedHat Distribution with its different HIGHIO conventions. */
 	.can_dma_32		= 1,
@@ -1305,7 +1304,6 @@ Scsi_Host_Template aic7xxx_driver_template = {
 #else
 	.highmem_io		= 1,
 #endif
-#endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
 	.name			= "aic7xxx",
 	.slave_alloc		= ahc_linux_slave_alloc,

drivers/scsi/aic7xxx/aic7xxx_osm_pci.c

@@ -166,6 +166,9 @@ ahc_linux_pci_dev_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		ahc->flags |= AHC_39BIT_ADDRESSING;
 		ahc->platform_data->hw_dma_mask =
 		    (bus_addr_t)(0x7FFFFFFFFFULL & (bus_addr_t)~0);
+	} else {
+		ahc_pci_set_dma_mask(pdev, 0xffffffffULL);
+		ahc->platform_data->hw_dma_mask = 0xffffffffULL;
 	}
 #endif
 	ahc->dev_softc = pci;