Merge git://git.linux-nfs.org/pub/linux/nfs-2.6

* git://git.linux-nfs.org/pub/linux/nfs-2.6:
  SUNRPC: Replace flush_workqueue() with cancel_work_sync() and friends
  NFS: Replace flush_scheduled_work with cancel_work_sync() and friends
  SUNRPC: Don't call gss_delete_sec_context() from an rcu context
  NFSv4: Don't call put_rpccred() from an rcu callback
  NFS: Fix NFSv4 open stateid regressions
  NFSv4: Fix a locking regression in nfs4_set_mode_locked()
  NFS: Fix put_nfs_open_context
  SUNRPC: Fix a race in rpciod_down()

4 files changed, 31 insertions, 41 deletions

diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 4bbc59cc237c..53995af9ca4b 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -736,9 +736,6 @@ gss_do_free_ctx(struct gss_cl_ctx *ctx)
 {
 	dprintk("RPC:       gss_free_ctx\n");
 
-	if (ctx->gc_gss_ctx)
-		gss_delete_sec_context(&ctx->gc_gss_ctx);
-
 	kfree(ctx->gc_wire_ctx.data);
 	kfree(ctx);
 }
@@ -753,7 +750,13 @@ gss_free_ctx_callback(struct rcu_head *head)
 static void
 gss_free_ctx(struct gss_cl_ctx *ctx)
 {
+	struct gss_ctx *gc_gss_ctx;
+
+	gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx);
+	rcu_assign_pointer(ctx->gc_gss_ctx, NULL);
 	call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
+	if (gc_gss_ctx)
+		gss_delete_sec_context(&gc_gss_ctx);
 }
 
 static void
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 01c3c4105204..ebe344f34d1a 100644
--- a/net/sunrpc/cache.c
+++ b/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;
 }
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 650af064ff8d..669e12a4ed18 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/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);
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index b5723c262a3e..954d7ec86c7e 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -50,8 +50,6 @@ static RPC_WAITQ(delay_queue, "delayq");
 /*
  * rpciod-related stuff
  */
-static DEFINE_MUTEX(rpciod_mutex);
-static atomic_t rpciod_users = ATOMIC_INIT(0);
 struct workqueue_struct *rpciod_workqueue;
 
 /*
@@ -961,60 +959,49 @@ void rpc_killall_tasks(struct rpc_clnt *clnt)
 	spin_unlock(&clnt->cl_lock);
 }
 
+int rpciod_up(void)
+{
+	return try_module_get(THIS_MODULE) ? 0 : -EINVAL;
+}
+
+void rpciod_down(void)
+{
+	module_put(THIS_MODULE);
+}
+
 /*
- * Start up the rpciod process if it's not already running.
+ * Start up the rpciod workqueue.
  */
-int
-rpciod_up(void)
+static int rpciod_start(void)
 {
 	struct workqueue_struct *wq;
-	int error = 0;
-
-	if (atomic_inc_not_zero(&rpciod_users))
-		return 0;
-
-	mutex_lock(&rpciod_mutex);
 
-	/* Guard against races with rpciod_down() */
-	if (rpciod_workqueue != NULL)
-		goto out_ok;
 	/*
 	 * Create the rpciod thread and wait for it to start.
 	 */
 	dprintk("RPC:       creating workqueue rpciod\n");
-	error = -ENOMEM;
 	wq = create_workqueue("rpciod");
-	if (wq == NULL)
-		goto out;
-
 	rpciod_workqueue = wq;
-	error = 0;
-out_ok:
-	atomic_inc(&rpciod_users);
-out:
-	mutex_unlock(&rpciod_mutex);
-	return error;
+	return rpciod_workqueue != NULL;
 }
 
-void
-rpciod_down(void)
+static void rpciod_stop(void)
 {
-	if (!atomic_dec_and_test(&rpciod_users))
-		return;
+	struct workqueue_struct *wq = NULL;
 
-	mutex_lock(&rpciod_mutex);
+	if (rpciod_workqueue == NULL)
+		return;
 	dprintk("RPC:       destroying workqueue rpciod\n");
 
-	if (atomic_read(&rpciod_users) == 0 && rpciod_workqueue != NULL) {
-		destroy_workqueue(rpciod_workqueue);
-		rpciod_workqueue = NULL;
-	}
-	mutex_unlock(&rpciod_mutex);
+	wq = rpciod_workqueue;
+	rpciod_workqueue = NULL;
+	destroy_workqueue(wq);
 }
 
 void
 rpc_destroy_mempool(void)
 {
+	rpciod_stop();
 	if (rpc_buffer_mempool)
 		mempool_destroy(rpc_buffer_mempool);
 	if (rpc_task_mempool)
@@ -1048,6 +1035,8 @@ rpc_init_mempool(void)
 						      rpc_buffer_slabp);
 	if (!rpc_buffer_mempool)
 		goto err_nomem;
+	if (!rpciod_start())
+		goto err_nomem;
 	return 0;
 err_nomem:
 	rpc_destroy_mempool();