diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 26f479e6c8ede12283e86b0176d9599d87daa775..b1ecfb850b5a9978a43bb63cb19df99de09a7e75 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -436,17 +436,19 @@ static int of_get_assoc_arrays(struct assoc_arrays *aa)
 static int of_drconf_to_nid_single(struct drmem_lmb *lmb)
 {
 	struct assoc_arrays aa = { .arrays = NULL };
-	int default_nid = 0;
+	int default_nid = NUMA_NO_NODE;
 	int nid = default_nid;
 	int rc, index;
 
+	if (min_common_depth < 0)
+		return default_nid;
+
 	rc = of_get_assoc_arrays(&aa);
 	if (rc)
 		return default_nid;
 
-	if (min_common_depth > 0 && min_common_depth <= aa.array_sz &&
-	    !(lmb->flags & DRCONF_MEM_AI_INVALID) &&
-	    lmb->aa_index < aa.n_arrays) {
+	if (min_common_depth <= aa.array_sz &&
+	    !(lmb->flags & DRCONF_MEM_AI_INVALID) && lmb->aa_index < aa.n_arrays) {
 		index = lmb->aa_index * aa.array_sz + min_common_depth - 1;
 		nid = of_read_number(&aa.arrays[index], 1);