[PATCH] apply nForce2 fixup only if C1 Halt Disconnect is enabled

Some boards don't support C1 Halt Disconnect.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/pci/fixup.c

@@ -226,7 +226,12 @@ static void __init pci_fixup_nforce2(struct pci_dev *dev)
 	fixed_val = rev < 0xC1 ? 0x1F01FF01 : 0x9F01FF01;
 
 	pci_read_config_dword(dev, 0x6c, &val);
-	if (val != fixed_val) {
+
+	/*
+	 * Apply fixup only if C1 Halt Disconnect is enabled
+	 * (bit28) because it is not supported on some boards.
+	 */
+	if ((val & (1 << 28)) && val != fixed_val) {
 		printk(KERN_WARNING "PCI: nForce2 C1 Halt Disconnect fixup\n");
 		pci_write_config_dword(dev, 0x6c, fixed_val);
 	}