diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 617e9ae..e11aacb 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3394,6 +3394,7 @@
 		WARN_ON(1);
 		tsession = NULL;
 		target = -1;
+		mutex_lock(&session->s_mutex);
 	}
 	goto retry;