diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 15af618..1835481 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -126,7 +126,16 @@
 	}
 }
 
-static void msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
+/*
+ * PCI 2.3 does not specify mask bits for each MSI interrupt.  Attempting to
+ * mask all MSI interrupts by clearing the MSI enable bit does not work
+ * reliably as devices without an INTx disable bit will then generate a
+ * level IRQ which will never be cleared.
+ *
+ * Returns 1 if it succeeded in masking the interrupt and 0 if the device
+ * doesn't support MSI masking.
+ */
+static int msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
 {
 	struct msi_desc *entry;
 
@@ -144,8 +153,7 @@
 			mask_bits |= flag & mask;
 			pci_write_config_dword(entry->dev, pos, mask_bits);
 		} else {
-			__msi_set_enable(entry->dev, entry->msi_attrib.pos,
-					 !flag);
+			return 0;
 		}
 		break;
 	case PCI_CAP_ID_MSIX:
@@ -161,6 +169,7 @@
 		break;
 	}
 	entry->msi_attrib.masked = !!flag;
+	return 1;
 }
 
 void read_msi_msg(unsigned int irq, struct msi_msg *msg)