1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 1427a386a033..3e4d1e7998da 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1417,6 +1417,15 @@ static int btt_claim_class(struct device *dev)
                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
                 struct nd_namespace_index *nsindex;
 
+                /*
+                 * If any of the DIMMs do not support labels the only
+                 * possible BTT format is v1.
+                 */
+                if (!ndd) {
+                        loop_bitmask = 0;
+                        break;
+                }
+
                 nsindex = to_namespace_index(ndd, ndd->ns_current);
                 if (nsindex == NULL)
                         loop_bitmask |= 1;