1 files changed, 6 insertions, 2 deletions

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index ed2b1151b171..7cbdf1b2e4ab 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -774,8 +774,12 @@ static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task)
 {
         if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
                 rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
-                dprintk("%s slot is busy\n", __func__);
-                return false;
+                /* Race breaker */
+                if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
+                        dprintk("%s slot is busy\n", __func__);
+                        return false;
+                }
+                rpc_wake_up_queued_task(&clp->cl_cb_waitq, task);
         }
         return true;
 }