[PATCH] fix a few missing return value checks in scsi

The attached patch adds a few error checks for the pci dma_mask setting
routines, which after all can fail and thus need their return code
checked.

drivers/scsi/aic7xxx/aic79xx_osm.c

@@ -1776,12 +1776,18 @@ ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
 	 * our dma mask when doing allocations.
 	 */
 	if (ahd->dev_softc != NULL)
-		ahd_pci_set_dma_mask(ahd->dev_softc, 0xFFFFFFFF);
+		if (ahd_pci_set_dma_mask(ahd->dev_softc, 0xFFFFFFFF)) {
+			printk(KERN_WARNING "aic79xx: No suitable DMA available.\n");
+			return (ENODEV);
+		}
 	*vaddr = pci_alloc_consistent(ahd->dev_softc,
 				      dmat->maxsize, &map->bus_addr);
 	if (ahd->dev_softc != NULL)
-		ahd_pci_set_dma_mask(ahd->dev_softc,
-				     ahd->platform_data->hw_dma_mask);
+		if (ahd_pci_set_dma_mask(ahd->dev_softc,
+				     ahd->platform_data->hw_dma_mask)) {
+			printk(KERN_WARNING "aic79xx: No suitable DMA available.\n");
+			return (ENODEV);
+		}
 #else /* LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0) */
 	/*
 	 * At least in 2.2.14, malloc is a slab allocator so all

drivers/scsi/aic7xxx/aic7xxx_osm.c

@@ -1411,12 +1411,18 @@ ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 	 * our dma mask when doing allocations.
 	 */
 	if (ahc->dev_softc != NULL)
-		ahc_pci_set_dma_mask(ahc->dev_softc, 0xFFFFFFFF);
+		if (ahc_pci_set_dma_mask(ahc->dev_softc, 0xFFFFFFFF)) {
+			printk(KERN_WARNING "aic7xxx: No suitable DMA available.\n");
+			return (ENODEV);
+		}
 	*vaddr = pci_alloc_consistent(ahc->dev_softc,
 				      dmat->maxsize, &map->bus_addr);
 	if (ahc->dev_softc != NULL)
-		ahc_pci_set_dma_mask(ahc->dev_softc,
-				     ahc->platform_data->hw_dma_mask);
+		if (ahc_pci_set_dma_mask(ahc->dev_softc,
+				     ahc->platform_data->hw_dma_mask)) {
+			printk(KERN_WARNING "aic7xxx: No suitable DMA available.\n");
+			return (ENODEV);
+		}
 #else /* LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0) */
 	/*
 	 * At least in 2.2.14, malloc is a slab allocator so all

drivers/scsi/aic7xxx/aic7xxx_osm_pci.c

@@ -166,7 +166,10 @@ 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 = mask_39bit;
 	} else {
-		ahc_pci_set_dma_mask(pdev, 0xFFFFFFFF);
+		if (ahc_pci_set_dma_mask(pdev, 0xFFFFFFFF)) {
+			printk(KERN_WARNING "aic7xxx: No suitable DMA available.\n");
+                	return (-ENODEV);
+		}
 		ahc->platform_data->hw_dma_mask = 0xFFFFFFFF;
 	}
 #endif