diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index d281201..74801f7 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -759,3 +759,24 @@
 {
 	INIT_LIST_HEAD(&dev->msi_list);
 }
+
+#ifdef CONFIG_ACPI
+#include <linux/acpi.h>
+#include <linux/pci-acpi.h>
+static void __devinit msi_acpi_init(void)
+{
+	if (acpi_pci_disabled)
+		return;
+	pci_osc_support_set(OSC_MSI_SUPPORT);
+	pcie_osc_support_set(OSC_MSI_SUPPORT);
+}
+#else
+static inline void msi_acpi_init(void) { }
+#endif /* CONFIG_ACPI */
+
+void __devinit msi_init(void)
+{
+	if (!pci_msi_enable)
+		return;
+	msi_acpi_init();
+}
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 4db261e..aee73cf 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1933,6 +1933,9 @@
 	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 		pci_fixup_device(pci_fixup_final, dev);
 	}
+
+	msi_init();
+
 	return 0;
 }
 
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index b205ab8..9de87e9 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -98,9 +98,11 @@
 #ifdef CONFIG_PCI_MSI
 void pci_no_msi(void);
 extern void pci_msi_init_pci_dev(struct pci_dev *dev);
+extern void __devinit msi_init(void);
 #else
 static inline void pci_no_msi(void) { }
 static inline void pci_msi_init_pci_dev(struct pci_dev *dev) { }
+static inline void msi_init(void) { }
 #endif
 
 #ifdef CONFIG_PCIEAER