SUNRPC: Check whether the task was transmitted before rebind/reconnect

Before initiating transport actions that require putting the task to sleep,
such as rebinding or reconnecting, we should check whether or not the task
was already transmitted.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 9cf63e6..67c955d 100644 (file)
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1812,6 +1812,24 @@ out:
 }
 
 /*
+ * Helpers to check if the task was already transmitted, and
+ * to take action when that is the case.
+ */
+static bool
+rpc_task_transmitted(struct rpc_task *task)
+{
+       return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate);
+}
+
+static void
+rpc_task_handle_transmitted(struct rpc_task *task)
+{
+       xprt_end_transmit(task);
+       task->tk_action = call_transmit_status;
+       call_transmit_status(task);
+}
+
+/*
  * 4.  Get the server port number if not yet set
  */
 static void
@@ -1819,6 +1837,11 @@ call_bind(struct rpc_task *task)
 {
        struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
 
+       if (rpc_task_transmitted(task)) {
+               rpc_task_handle_transmitted(task);
+               return;
+       }
+
        dprint_status(task);
 
        task->tk_action = call_connect;
@@ -1837,6 +1860,11 @@ call_bind_status(struct rpc_task *task)
 {
        int status = -EIO;
 
+       if (rpc_task_transmitted(task)) {
+               rpc_task_handle_transmitted(task);
+               return;
+       }
+
        if (task->tk_status >= 0) {
                dprint_status(task);
                task->tk_status = 0;
@@ -1916,6 +1944,11 @@ call_connect(struct rpc_task *task)
 {
        struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
 
+       if (rpc_task_transmitted(task)) {
+               rpc_task_handle_transmitted(task);
+               return;
+       }
+
        dprintk("RPC: %5u call_connect xprt %p %s connected\n",
                        task->tk_pid, xprt,
                        (xprt_connected(xprt) ? "is" : "is not"));
@@ -1942,10 +1975,8 @@ call_connect_status(struct rpc_task *task)
        struct rpc_clnt *clnt = task->tk_client;
        int status = task->tk_status;
 
-       /* Check if the task was already transmitted */
-       if (!test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) {
-               xprt_end_transmit(task);
-               task->tk_action = call_transmit_status;
+       if (rpc_task_transmitted(task)) {
+               rpc_task_handle_transmitted(task);
                return;
        }
 
@@ -2001,6 +2032,11 @@ out_retry:
 static void
 call_transmit(struct rpc_task *task)
 {
+       if (rpc_task_transmitted(task)) {
+               rpc_task_handle_transmitted(task);
+               return;
+       }
+
        dprint_status(task);
 
        task->tk_action = call_transmit_status;