diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@@ -5695,6 +5695,9 @@
 	struct pci_devinfo *dinfo;
 	int error, rid, type;
 
+	if (device_get_parent(child) != dev)
+		return (bus_generic_activate_resource(dev, child, r));
+
 	dinfo = device_get_ivars(child);
 #ifdef PCI_IOV
 	if (dinfo->cfg.flags & PCICFG_VF) {
@@ -5716,20 +5719,20 @@
 	if (error)
 		return (error);
 
+	rid = rman_get_rid(r);
+	type = rman_get_type(r);
+
+	/* Device ROMs need their decoding explicitly enabled. */
+	if (type == SYS_RES_MEMORY && PCIR_IS_BIOS(&dinfo->cfg, rid))
+		pci_write_bar(child, pci_find_bar(child, rid),
+		    rman_get_start(r) | PCIM_BIOS_ENABLE);
+
 	/* Enable decoding in the command register when activating BARs. */
-	if (device_get_parent(child) == dev) {
-		/* Device ROMs need their decoding explicitly enabled. */
-		rid = rman_get_rid(r);
-		type = rman_get_type(r);
-		if (type == SYS_RES_MEMORY && PCIR_IS_BIOS(&dinfo->cfg, rid))
-			pci_write_bar(child, pci_find_bar(child, rid),
-			    rman_get_start(r) | PCIM_BIOS_ENABLE);
-		switch (type) {
-		case SYS_RES_IOPORT:
-		case SYS_RES_MEMORY:
-			error = PCI_ENABLE_IO(dev, child, type);
-			break;
-		}
+	switch (type) {
+	case SYS_RES_IOPORT:
+	case SYS_RES_MEMORY:
+		error = PCI_ENABLE_IO(dev, child, type);
+		break;
 	}
 	return (error);
 }
@@ -5740,6 +5743,9 @@
 	struct pci_devinfo *dinfo;
 	int error, rid, type;
 
+	if (device_get_parent(child) != dev)
+		return (bus_generic_deactivate_resource(dev, child, r));
+
 	dinfo = device_get_ivars(child);
 #ifdef PCI_IOV
 	if (dinfo->cfg.flags & PCICFG_VF) {
@@ -5762,13 +5768,11 @@
 		return (error);
 
 	/* Disable decoding for device ROMs. */
-	if (device_get_parent(child) == dev) {
-		rid = rman_get_rid(r);
-		type = rman_get_type(r);
-		if (type == SYS_RES_MEMORY && PCIR_IS_BIOS(&dinfo->cfg, rid))
-			pci_write_bar(child, pci_find_bar(child, rid),
-			    rman_get_start(r));
-	}
+	rid = rman_get_rid(r);
+	type = rman_get_type(r);
+	if (type == SYS_RES_MEMORY && PCIR_IS_BIOS(&dinfo->cfg, rid))
+		pci_write_bar(child, pci_find_bar(child, rid),
+		    rman_get_start(r));
 	return (0);
 }
 
@@ -5779,6 +5783,10 @@
 {
 	struct pci_devinfo *dinfo;
 
+	if (device_get_parent(child) != dev)
+		return (bus_generic_adjust_resource(dev, child, r, start,
+		    end));
+
 	dinfo = device_get_ivars(child);
 	if (dinfo->cfg.flags & PCICFG_VF) {
 		switch (rman_get_type(r)) {
@@ -5802,6 +5810,10 @@
 {
 	struct pci_devinfo *dinfo;
 
+	if (device_get_parent(child) != dev)
+		return (bus_generic_map_resource(dev, child, r, argsp,
+		    map));
+
 	dinfo = device_get_ivars(child);
 	if (dinfo->cfg.flags & PCICFG_VF) {
 		switch (rman_get_type(r)) {
@@ -5825,6 +5837,9 @@
 {
 	struct pci_devinfo *dinfo;
 
+	if (device_get_parent(child) != dev)
+		return (bus_generic_unmap_resource(dev, child, r, map));
+
 	dinfo = device_get_ivars(child);
 	if (dinfo->cfg.flags & PCICFG_VF) {
 		switch (rman_get_type(r)) {