1 files changed, 7 insertions, 2 deletions

diff --git a/fs/nfs/nfs4renewd.c b/fs/nfs/nfs4renewd.c
index 72b6c580af13..cde5650ee5a2 100644
--- a/fs/nfs/nfs4renewd.c
+++ b/fs/nfs/nfs4renewd.c
@@ -63,9 +63,14 @@ nfs4_renew_state(struct work_struct *work)
 
         ops = clp->cl_mvops->state_renewal_ops;
         dprintk("%s: start\n", __func__);
-        /* Are there any active superblocks? */
-        if (list_empty(&clp->cl_superblocks))
+
+        rcu_read_lock();
+        if (list_empty(&clp->cl_superblocks)) {
+                rcu_read_unlock();
                 goto out;
+        }
+        rcu_read_unlock();
+
         spin_lock(&clp->cl_lock);
         lease = clp->cl_lease_time;
         last = clp->cl_last_renewal;