NFSv4.1: Don't set up a backchannel if the server didn't agree to do so

If the server doesn't agree to out backchannel setup request, then
don't set one up.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/nfs/nfs4session.c b/fs/nfs/nfs4session.c
index e799dc3c3b1d..e23366effcfb 100644
--- a/fs/nfs/nfs4session.c
+++ b/fs/nfs/nfs4session.c
@@ -450,7 +450,7 @@ int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
         tbl = &ses->fc_slot_table;
         tbl->session = ses;
         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
-        if (status) /* -ENOMEM */
+        if (status || !(ses->flags & SESSION4_BACK_CHAN)) /* -ENOMEM */
                 return status;
         /* Back channel */
         tbl = &ses->bc_slot_table;