SUNRPC: Replace flush_workqueue() with cancel_work_sync() and friends

Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

net/sunrpc/cache.c

@@ -371,8 +371,7 @@ int cache_unregister(struct cache_detail *cd)
 	}
 	if (list_empty(&cache_list)) {
 		/* module must be being unloaded so its safe to kill the worker */
-		cancel_delayed_work(&cache_cleaner);
-		flush_scheduled_work();
+		cancel_delayed_work_sync(&cache_cleaner);
 	}
 	return 0;
 }

net/sunrpc/rpc_pipe.c

@@ -132,8 +132,7 @@ rpc_close_pipes(struct inode *inode)
 		rpci->nwriters = 0;
 		if (ops->release_pipe)
 			ops->release_pipe(inode);
-		cancel_delayed_work(&rpci->queue_timeout);
-		flush_workqueue(rpciod_workqueue);
+		cancel_delayed_work_sync(&rpci->queue_timeout);
 	}
 	rpc_inode_setowner(inode, NULL);
 	mutex_unlock(&inode->i_mutex);