diff --git a/drivers/ata/pata_hpt37x.c b/drivers/ata/pata_hpt37x.c
index defd9b8..4224cfc 100644
--- a/drivers/ata/pata_hpt37x.c
+++ b/drivers/ata/pata_hpt37x.c
@@ -799,9 +799,8 @@
 	static const int MHz[4] = { 33, 40, 50, 66 };
 	void *private_data = NULL;
 	const struct ata_port_info *ppi[] = { NULL, NULL };
-
+	u8 rev = dev->revision;
 	u8 irqmask;
-	u32 class_rev;
 	u8 mcr1;
 	u32 freq;
 	int prefer_dpll = 1;
@@ -816,19 +815,16 @@
 	if (rc)
 		return rc;
 
-	pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
-	class_rev &= 0xFF;
-
 	if (dev->device == PCI_DEVICE_ID_TTI_HPT366) {
 		/* May be a later chip in disguise. Check */
 		/* Older chips are in the HPT366 driver. Ignore them */
-		if (class_rev < 3)
+		if (rev < 3)
 			return -ENODEV;
 		/* N series chips have their own driver. Ignore */
-		if (class_rev == 6)
+		if (rev == 6)
 			return -ENODEV;
 
-		switch(class_rev) {
+		switch(rev) {
 			case 3:
 				ppi[0] = &info_hpt370;
 				chip_table = &hpt370;
@@ -844,28 +840,29 @@
 				chip_table = &hpt372;
 				break;
 			default:
-				printk(KERN_ERR "pata_hpt37x: Unknown HPT366 subtype please report (%d).\n", class_rev);
+				printk(KERN_ERR "pata_hpt37x: Unknown HPT366 "
+				       "subtype, please report (%d).\n", rev);
 				return -ENODEV;
 		}
 	} else {
 		switch(dev->device) {
 			case PCI_DEVICE_ID_TTI_HPT372:
 				/* 372N if rev >= 2*/
-				if (class_rev >= 2)
+				if (rev >= 2)
 					return -ENODEV;
 				ppi[0] = &info_hpt372;
 				chip_table = &hpt372a;
 				break;
 			case PCI_DEVICE_ID_TTI_HPT302:
 				/* 302N if rev > 1 */
-				if (class_rev > 1)
+				if (rev > 1)
 					return -ENODEV;
 				ppi[0] = &info_hpt372;
 				/* Check this */
 				chip_table = &hpt302;
 				break;
 			case PCI_DEVICE_ID_TTI_HPT371:
-				if (class_rev > 1)
+				if (rev > 1)
 					return -ENODEV;
 				ppi[0] = &info_hpt372;
 				chip_table = &hpt371;