SUNRPC: Fix up socket autodisconnect

Ensure that we don't forget to set up the disconnection timer for the
case when a connect request is fulfilled after the RPC request that
initiated it has timed out or been interrupted.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

net/sunrpc/xprt.c

@@ -680,6 +680,20 @@ void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie)
 	spin_unlock_bh(&xprt->transport_lock);
 }
 
+static bool
+xprt_has_timer(const struct rpc_xprt *xprt)
+{
+	return xprt->idle_timeout != 0;
+}
+
+static void
+xprt_schedule_autodisconnect(struct rpc_xprt *xprt)
+	__must_hold(&xprt->transport_lock)
+{
+	if (list_empty(&xprt->recv) && xprt_has_timer(xprt))
+		mod_timer(&xprt->timer, xprt->last_used + xprt->idle_timeout);
+}
+
 static void
 xprt_init_autodisconnect(unsigned long data)
 {
@@ -688,6 +702,8 @@ xprt_init_autodisconnect(unsigned long data)
 	spin_lock(&xprt->transport_lock);
 	if (!list_empty(&xprt->recv))
 		goto out_abort;
+	/* Reset xprt->last_used to avoid connect/autodisconnect cycling */
+	xprt->last_used = jiffies;
 	if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
 		goto out_abort;
 	spin_unlock(&xprt->transport_lock);
@@ -725,6 +741,7 @@ void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie)
 		goto out;
 	xprt->snd_task =NULL;
 	xprt->ops->release_xprt(xprt, NULL);
+	xprt_schedule_autodisconnect(xprt);
 out:
 	spin_unlock_bh(&xprt->transport_lock);
 	wake_up_bit(&xprt->state, XPRT_LOCKED);
@@ -888,11 +905,6 @@ static void xprt_timer(struct rpc_task *task)
 	spin_unlock_bh(&xprt->transport_lock);
 }
 
-static inline int xprt_has_timer(struct rpc_xprt *xprt)
-{
-	return xprt->idle_timeout != 0;
-}
-
 /**
  * xprt_prepare_transmit - reserve the transport before sending a request
  * @task: RPC task about to send a request
@@ -1280,9 +1292,7 @@ void xprt_release(struct rpc_task *task)
 	if (!list_empty(&req->rq_list))
 		list_del(&req->rq_list);
 	xprt->last_used = jiffies;
-	if (list_empty(&xprt->recv) && xprt_has_timer(xprt))
-		mod_timer(&xprt->timer,
-				xprt->last_used + xprt->idle_timeout);
+	xprt_schedule_autodisconnect(xprt);
 	spin_unlock_bh(&xprt->transport_lock);
 	if (req->rq_buffer)
 		xprt->ops->buf_free(req->rq_buffer);