1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index e36a9d78ea49..197806fb87ff 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -427,6 +427,8 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
         if (clp == NULL)
                 goto out;
 
+        if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
+                goto out;
         tbl = &clp->cl_session->bc_slot_table;
 
         spin_lock(&tbl->slot_tbl_lock);