diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index 83a41a4..aa5942c 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -887,6 +887,12 @@ detect_alua(struct path * pp)
 	int tpgs;
 	unsigned int timeout;
 
+
+	if (pp->bus != SYSFS_BUS_SCSI) {
+		pp->tpgs = TPGS_NONE;
+		return;
+	}
+
 	if (sysfs_get_timeout(pp, &timeout) <= 0)
 		timeout = DEF_TIMEOUT;
 
diff --git a/libmultipath/propsel.c b/libmultipath/propsel.c
index 897e48c..d362beb 100644
--- a/libmultipath/propsel.c
+++ b/libmultipath/propsel.c
@@ -521,7 +521,9 @@ int select_checker(struct config *conf, struct path *pp)
 		if (check_rdac(pp)) {
 			ckr_name = RDAC;
 			goto out;
-		} else if (path_get_tpgs(pp) != TPGS_NONE) {
+		}
+		path_get_tpgs(pp);
+		if (pp->tpgs != TPGS_NONE && pp->tpgs != TPGS_UNDEF) {
 			ckr_name = TUR;
 			goto out;
 		}