--- libdrm-2.4.26/tests/drmtest.c.orig	2011-07-26 04:19:11.588181734 +0200
+++ libdrm-2.4.26/tests/drmtest.c	2011-07-26 04:19:55.473496395 +0200
@@ -79,11 +79,13 @@ int drm_open_matching(const char *pci_gl
 		device = udev_device_new_from_syspath(udev, path);
 		parent = udev_device_get_parent(device);
 		/* Filter out KMS output devices. */
-		if (strcmp(udev_device_get_subsystem(parent), "pci") != 0)
-			continue;
-		pci_id = udev_device_get_property_value(parent, "PCI_ID");
-		if (fnmatch(pci_glob, pci_id, 0) != 0)
-			continue;
+		if (parent) {
+			if (strcmp(udev_device_get_subsystem(parent), "pci") != 0)
+				continue;
+			pci_id = udev_device_get_property_value(parent, "PCI_ID");
+			if (fnmatch(pci_glob, pci_id, 0) != 0)
+				continue;
+		}
 		fd = open(udev_device_get_devnode(device), O_RDWR);
 		if (fd < 0)
 			continue;