diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index 951735c9ec0b..0189dcd36f31 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -1303,10 +1303,13 @@ static void b44_chip_reset(struct b44 *bp, int reset_kind)
 		     & MDIO_CTRL_MAXF_MASK)));
 		break;
 	case SSB_BUSTYPE_PCI:
-	case SSB_BUSTYPE_PCMCIA:
 		bw32(bp, B44_MDIO_CTRL, (MDIO_CTRL_PREAMBLE |
 		     (0x0d & MDIO_CTRL_MAXF_MASK)));
 		break;
+	case SSB_BUSTYPE_PCMCIA:
+	case SSB_BUSTYPE_SDIO:
+		WARN_ON(1); /* A device with this bus does not exist. */
+		break;
 	}
 
 	br32(bp, B44_MDIO_CTRL);
@@ -1764,10 +1767,13 @@ static void b44_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *inf
 	case SSB_BUSTYPE_PCI:
 		strlcpy(info->bus_info, pci_name(bus->host_pci), sizeof(info->bus_info));
 		break;
-	case SSB_BUSTYPE_PCMCIA:
 	case SSB_BUSTYPE_SSB:
 		strlcpy(info->bus_info, "SSB", sizeof(info->bus_info));
 		break;
+	case SSB_BUSTYPE_PCMCIA:
+	case SSB_BUSTYPE_SDIO:
+		WARN_ON(1); /* A device with this bus does not exist. */
+		break;
 	}
 }
 
diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index d29323d50837..7a9a3fa55425 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -4092,16 +4092,20 @@ static void b43_imcfglo_timeouts_workaround(struct b43_wldev *dev)
 	    bus->pcicore.dev->id.revision <= 5) {
 		/* IMCFGLO timeouts workaround. */
 		tmp = ssb_read32(dev->dev, SSB_IMCFGLO);
-		tmp &= ~SSB_IMCFGLO_REQTO;
-		tmp &= ~SSB_IMCFGLO_SERTO;
 		switch (bus->bustype) {
 		case SSB_BUSTYPE_PCI:
 		case SSB_BUSTYPE_PCMCIA:
+			tmp &= ~SSB_IMCFGLO_REQTO;
+			tmp &= ~SSB_IMCFGLO_SERTO;
 			tmp |= 0x32;
 			break;
 		case SSB_BUSTYPE_SSB:
+			tmp &= ~SSB_IMCFGLO_REQTO;
+			tmp &= ~SSB_IMCFGLO_SERTO;
 			tmp |= 0x53;
 			break;
+		default:
+			break;
 		}
 		ssb_write32(dev->dev, SSB_IMCFGLO, tmp);
 	}
diff --git a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c
index b166a6f9f055..1d9223b3d4c4 100644
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -3106,16 +3106,20 @@ static void b43legacy_imcfglo_timeouts_workaround(struct b43legacy_wldev *dev)
 	    bus->pcicore.dev->id.revision <= 5) {
 		/* IMCFGLO timeouts workaround. */
 		tmp = ssb_read32(dev->dev, SSB_IMCFGLO);
-		tmp &= ~SSB_IMCFGLO_REQTO;
-		tmp &= ~SSB_IMCFGLO_SERTO;
 		switch (bus->bustype) {
 		case SSB_BUSTYPE_PCI:
 		case SSB_BUSTYPE_PCMCIA:
+			tmp &= ~SSB_IMCFGLO_REQTO;
+			tmp &= ~SSB_IMCFGLO_SERTO;
 			tmp |= 0x32;
 			break;
 		case SSB_BUSTYPE_SSB:
+			tmp &= ~SSB_IMCFGLO_REQTO;
+			tmp &= ~SSB_IMCFGLO_SERTO;
 			tmp |= 0x53;
 			break;
+		default:
+			break;
 		}
 		ssb_write32(dev->dev, SSB_IMCFGLO, tmp);
 	}