[PATCH] ALI IDE forward port from 2.4.x

This forward-ports some more of the ALI IDE sanity checks from the 2.4.x
tree. 

In particular, we only do the enable bits for revisions < 0xC5

drivers/ide/pci/alim15x3.c

@@ -629,11 +629,13 @@ static unsigned int __init init_chipset_ali15x3 (struct pci_dev *dev, const char
 	 * box without a device at 0:0.0. The ALi bridge will be at
 	 * 0:0.0 so if we didn't find one we know what is cooking.
 	 */
-	if (!isa_dev || (north && north->vendor != PCI_VENDOR_ID_AL)) {
+	if (north && north->vendor != PCI_VENDOR_ID_AL) {
 		local_irq_restore(flags);
 	        return 0;
 	}
 
+	if (m5229_revision < 0xC5 && isa_dev)
+	{	
 		/*
 		 * set south-bridge's enable bit, m1533, 0x79
 		 */
@@ -650,7 +652,7 @@ static unsigned int __init init_chipset_ali15x3 (struct pci_dev *dev, const char
 			 */
 			pci_write_config_byte(isa_dev, 0x79, tmpbyte | 0x02);
 		}
-
+	}
 	local_irq_restore(flags);
 	return 0;
 }