pci: don't disable too many HT MSI mapping

Prakash's system needs MSI disabled on some bridges, but not all.
This seems to be the minimal fix for 2.6.29, but should be replaced
during 2.6.30.
Signed-off-by: Prakash Punnoor <prakash@punnoor.de>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>

drivers/pci/quirks.c

@@ -2166,6 +2166,10 @@ static void __devinit nv_msi_ht_cap_quirk(struct pci_dev *dev)
 	int pos;
 	int found;
 
+	/* Enabling HT MSI mapping on this device breaks MCP51 */
+	if (dev->device == 0x270)
+		return;
+
 	/* check if there is HT MSI cap or enabled on this device */
 	found = ht_check_msi_mapping(dev);