Merge tag 'nfs-for-3.8-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfix from Trond Myklebust:

- Fix a socket lock leak in net/sunrpc/xprt.c

* tag 'nfs-for-3.8-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  SUNRPC: Ensure we release the socket write lock if the rpc_task exits early

Author: torvalds

net/sunrpc/sched.c

@@ -972,8 +972,7 @@ static void rpc_async_release(struct work_struct *work)
 
 static void rpc_release_resources_task(struct rpc_task *task)
 {
-	if (task->tk_rqstp)
-		xprt_release(task);
+	xprt_release(task);
 	if (task->tk_msg.rpc_cred) {
 		put_rpccred(task->tk_msg.rpc_cred);
 		task->tk_msg.rpc_cred = NULL;

net/sunrpc/xprt.c

@@ -1136,10 +1136,18 @@ static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt)
 void xprt_release(struct rpc_task *task)
 {
 	struct rpc_xprt	*xprt;
-	struct rpc_rqst	*req;
+	struct rpc_rqst	*req = task->tk_rqstp;
 
-	if (!(req = task->tk_rqstp))
+	if (req == NULL) {
+		if (task->tk_client) {
+			rcu_read_lock();
+			xprt = rcu_dereference(task->tk_client->cl_xprt);
+			if (xprt->snd_task == task)
+				xprt_release_write(xprt, task);
+			rcu_read_unlock();
+		}
 		return;
+	}
 
 	xprt = req->rq_xprt;
 	if (task->tk_ops->rpc_count_stats != NULL)