3 files changed, 26 insertions, 2 deletions

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index b5ab9aa6ff7c..2b85aa39f954 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -453,7 +453,7 @@ static void enable_msi_mode(struct pci_dev *dev, int pos, int type)
         }
 }
 
-static void disable_msi_mode(struct pci_dev *dev, int pos, int type)
+void disable_msi_mode(struct pci_dev *dev, int pos, int type)
 {
         u16 control;
 
@@ -699,6 +699,9 @@ int pci_enable_msi(struct pci_dev* dev)
         if (!pci_msi_enable || !dev)
                 return status;
 
+        if (dev->no_msi)
+                return status;
+
         temp = dev->irq;
 
         if ((status = msi_init()) < 0)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index d94d7af4f7a0..fa36094aa0f9 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -46,7 +46,7 @@ extern int pci_msi_quirk;
 #else
 #define pci_msi_quirk 0
 #endif
-
+void disable_msi_mode(struct pci_dev *dev, int pos, int type);
 extern int pcie_mch_quirk;
 extern struct device_attribute pci_dev_attrs[];
 extern struct class_device_attribute class_device_attr_cpuaffinity;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index a9160ad16581..bb36bb69803f 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1291,6 +1291,27 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7520_MCH,	quir
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7320_MCH,  quirk_pcie_mch );
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7525_MCH,  quirk_pcie_mch );
 
+
+/*
+ * It's possible for the MSI to get corrupted if shpc and acpi
+ * are used together on certain PXH-based systems.
+ */
+static void __devinit quirk_pcie_pxh(struct pci_dev *dev)
+{
+        disable_msi_mode(dev, pci_find_capability(dev, PCI_CAP_ID_MSI),
+                                        PCI_CAP_ID_MSI);
+        dev->no_msi = 1;
+
+        printk(KERN_WARNING "PCI: PXH quirk detected, "
+                "disabling MSI for SHPC device\n");
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_PXHD_0,     quirk_pcie_pxh);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_PXHD_1,     quirk_pcie_pxh);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_PXH_0,      quirk_pcie_pxh);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_PXH_1,      quirk_pcie_pxh);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_PXHV,       quirk_pcie_pxh);
+
+
 static void __devinit quirk_netmos(struct pci_dev *dev)
 {
         unsigned int num_parallel = (dev->subsystem_device & 0xf0) >> 4;