diff --git a/drivers/ide/pci/via82cxxx.c b/drivers/ide/pci/via82cxxx.c
index eb7ab112c050..61f1a9665a7f 100644
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -282,11 +282,11 @@ static unsigned int __devinit init_chipset_via82cxxx(struct pci_dev *dev, const
 	 * Find the ISA bridge to see how good the IDE is.
 	 */
 	via_config = via_config_find(&isa);
-	if (!via_config->id) {
-		printk(KERN_WARNING "VP_IDE: Unknown VIA SouthBridge, disabling DMA.\n");
-		pci_dev_put(isa);
-		return -ENODEV;
-	}
+
+	/* We checked this earlier so if it fails here deeep badness
+	   is involved */
+
+	BUG_ON(!via_config->id);
 
 	/*
 	 * Setup or disable Clk66 if appropriate
@@ -494,6 +494,17 @@ static ide_pci_device_t via82cxxx_chipsets[] __devinitdata = {
 
 static int __devinit via_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
+	struct pci_dev *isa = NULL;
+	struct via_isa_bridge *via_config;
+	/*
+	 * Find the ISA bridge and check we know what it is.
+	 */
+	via_config = via_config_find(&isa);
+	pci_dev_put(isa);
+	if (!via_config->id) {
+		printk(KERN_WARNING "VP_IDE: Unknown VIA SouthBridge, disabling DMA.\n");
+		return -ENODEV;
+	}
 	return ide_setup_pci_device(dev, &via82cxxx_chipsets[id->driver_data]);
 }