SUNRPC: Fix up missing BKL in asynchronous RPC callback functions

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

include/linux/sunrpc/sched.h

@@ -252,6 +252,7 @@ void		rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt,
 void		rpc_put_task(struct rpc_task *);
 void		rpc_release_task(struct rpc_task *);
 void		rpc_exit_task(struct rpc_task *);
+void		rpc_release_calldata(const struct rpc_call_ops *, void *);
 void		rpc_killall_tasks(struct rpc_clnt *);
 int		rpc_execute(struct rpc_task *);
 void		rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);

net/sunrpc/clnt.c

@@ -541,8 +541,7 @@ rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
 	rpc_restore_sigmask(&oldset);		
 	return status;
 out_release:
-	if (tk_ops->rpc_release != NULL)
-		tk_ops->rpc_release(data);
+	rpc_release_calldata(tk_ops, data);
 	return status;
 }
 

net/sunrpc/sched.c

@@ -608,6 +608,15 @@ void rpc_exit_task(struct rpc_task *task)
 }
 EXPORT_SYMBOL(rpc_exit_task);
 
+void rpc_release_calldata(const struct rpc_call_ops *ops, void *calldata)
+{
+	if (ops->rpc_release != NULL) {
+		lock_kernel();
+		ops->rpc_release(calldata);
+		unlock_kernel();
+	}
+}
+
 /*
  * This is the RPC `scheduler' (or rather, the finite state machine).
  */
@@ -883,8 +892,7 @@ void rpc_put_task(struct rpc_task *task)
 	}
 	if (task->tk_flags & RPC_TASK_DYNAMIC)
 		call_rcu_bh(&task->u.tk_rcu, rpc_free_task);
-	if (tk_ops->rpc_release)
-		tk_ops->rpc_release(calldata);
+	rpc_release_calldata(tk_ops, calldata);
 }
 EXPORT_SYMBOL(rpc_put_task);
 
@@ -928,8 +936,7 @@ struct rpc_task *rpc_run_task(struct rpc_clnt *clnt, int flags,
 	struct rpc_task *task;
 	task = rpc_new_task(clnt, flags, ops, data);
 	if (task == NULL) {
-		if (ops->rpc_release != NULL)
-			ops->rpc_release(data);
+		rpc_release_calldata(ops, data);
 		return ERR_PTR(-ENOMEM);
 	}
 	atomic_inc(&task->tk_count);