diff --git a/sys/compat/linuxkpi/common/src/linux_pci.c b/sys/compat/linuxkpi/common/src/linux_pci.c
--- a/sys/compat/linuxkpi/common/src/linux_pci.c
+++ b/sys/compat/linuxkpi/common/src/linux_pci.c
@@ -780,12 +780,18 @@
 linuxkpi_pci_iounmap(struct pci_dev *pdev, void *res)
 {
 	struct pci_mmio_region *mmio, *p;
+	bus_space_handle_t bh = (bus_space_handle_t)res;
 
 	TAILQ_FOREACH_SAFE(mmio, &pdev->mmio, next, p) {
-		if ((bus_space_handle_t)res < rman_get_bushandle(mmio->res) ||
-		    (bus_space_handle_t)res >= rman_get_bushandle(mmio->res) +
-					       rman_get_size(mmio->res))
-			continue;
+		if (pdev->want_iomap_res) {
+			if (res != mmio->res)
+				continue;
+		} else {
+			if (bh <  rman_get_bushandle(mmio->res) ||
+			    bh >= rman_get_bushandle(mmio->res) +
+				  rman_get_size(mmio->res))
+				continue;
+		}
 		bus_release_resource(pdev->dev.bsddev,
 		    mmio->type, mmio->rid, mmio->res);
 		TAILQ_REMOVE(&pdev->mmio, mmio, next);