diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 4aea563bda60720eb58b5f691c5eda4c6a7043ed..9c69b6966e7950da5671caa28b472700ce755ca1 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -940,14 +940,13 @@ int pci_enable_msi(struct pci_dev* dev)
 	if (!pos)
 		return -EINVAL;
 
-	pci_read_config_word(dev, msi_control_reg(pos), &control);
-	if (control & PCI_MSI_FLAGS_ENABLE)
-		return 0;			/* Already in MSI mode */
-
 	if (!msi_lookup_vector(dev, PCI_CAP_ID_MSI)) {
 		/* Lookup Sucess */
 		unsigned long flags;
 
+		pci_read_config_word(dev, msi_control_reg(pos), &control);
+		if (control & PCI_MSI_FLAGS_ENABLE)
+			return 0;	/* Already in MSI mode */
 		spin_lock_irqsave(&msi_lock, flags);
 		if (!vector_irq[dev->irq]) {
 			msi_desc[dev->irq]->msi_attrib.state = 0;