diff --git a/drivers/ide/pci/cmd640.c b/drivers/ide/pci/cmd640.c
index 3303ffb..fed9341 100644
--- a/drivers/ide/pci/cmd640.c
+++ b/drivers/ide/pci/cmd640.c
@@ -744,18 +744,19 @@
 	printk(KERN_INFO "cmd640: buggy cmd640%c interface on %s, config=0x%02x"
 			 "\n", 'a' + cmd640_chip_version - 1, bus_type, cfr);
 
-	cmd_hwif0 = &ide_hwifs[0];
-	cmd_hwif1 = &ide_hwifs[1];
+	cmd_hwif0 = ide_find_port();
 
 	/*
 	 * Initialize data for primary port
 	 */
-	ide_init_port_hw(cmd_hwif0, &hw[0]);
+	if (cmd_hwif0) {
+		ide_init_port_hw(cmd_hwif0, &hw[0]);
 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
-	cmd_hwif0->set_pio_mode = &cmd640_set_pio_mode;
+		cmd_hwif0->set_pio_mode = &cmd640_set_pio_mode;
 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
 
-	idx[0] = cmd_hwif0->index;
+		idx[0] = cmd_hwif0->index;
+	}
 
 	/*
 	 * Ensure compatibility by always using the slowest timings
@@ -767,10 +768,13 @@
 	put_cmd640_reg(CMDTIM, 0);
 	put_cmd640_reg(BRST, 0x40);
 
+	cmd_hwif1 = ide_find_port();
+
 	/*
 	 * Try to enable the secondary interface, if not already enabled
 	 */
-	if (cmd_hwif1->drives[0].noprobe && cmd_hwif1->drives[1].noprobe) {
+	if (cmd_hwif1 &&
+	    cmd_hwif1->drives[0].noprobe && cmd_hwif1->drives[1].noprobe) {
 		port2 = "not probed";
 	} else {
 		b = get_cmd640_reg(CNTRL);
@@ -801,7 +805,7 @@
 	/*
 	 * Initialize data for secondary cmd640 port, if enabled
 	 */
-	if (second_port_cmd640) {
+	if (second_port_cmd640 && cmd_hwif1) {
 		ide_init_port_hw(cmd_hwif1, &hw[1]);
 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
 		cmd_hwif1->set_pio_mode = &cmd640_set_pio_mode;
@@ -809,7 +813,7 @@
 
 		idx[1] = cmd_hwif1->index;
 	}
-	printk(KERN_INFO "%s: %sserialized, secondary interface %s\n", cmd_hwif1->name,
+	printk(KERN_INFO "cmd640: %sserialized, secondary interface %s\n",
 			 second_port_cmd640 ? "" : "not ", port2);
 
 	/*
@@ -819,10 +823,15 @@
 	for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) {
 		ide_drive_t *drive;
 
-		if (index > 1)
+		if (index > 1) {
+			if (cmd_hwif1 == NULL)
+				continue;
 			drive = &cmd_hwif1->drives[index & 1];
-		else
+		} else  {
+			if (cmd_hwif0 == NULL)
+				continue;
 			drive = &cmd_hwif0->drives[index & 1];
+		}
 
 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
 		if (drive->autotune || ((index > 1) && second_port_toggled)) {