diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index 07ac626287df..76a45b48d09f 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -685,6 +685,8 @@ static int vmd_get_bus_number_start(struct vmd_dev *vmd)
 	pci_read_config_word(dev, PCI_REG_VMCAP, &reg);
 	if (BUS_RESTRICT_CAP(reg)) {
 		pci_read_config_word(dev, PCI_REG_VMCONFIG, &reg);
+		if (PCI_POSSIBLE_ERROR(reg))
+			return -ENODEV;
 
 		switch (BUS_RESTRICT_CFG(reg)) {
 		case 0:
@@ -693,6 +695,7 @@ static int vmd_get_bus_number_start(struct vmd_dev *vmd)
 		case 1:
 			vmd->busn_start = 128;
 			break;
+		case 3:
 		case 2:
 			vmd->busn_start = 224;
 			break;