diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 7e268960954b..1d9fc078c7ad 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/bitops.h>
+#include <linux/bug.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -135,6 +136,9 @@ static void restore_dev_resource(struct pci_dev_resource *dev_res)
 {
 	struct resource *res = dev_res->res;
 
+	if (WARN_ON_ONCE(res->parent))
+		return;
+
 	res->start = dev_res->start;
 	res->end = dev_res->end;
 	res->flags = dev_res->flags;