RDS: introduce rds_conn_connect_if_down()

A few paths had the same block of code to queue a connection's connect work if
it was in the right state.  Let's move this in to a helper function.
Signed-off-by: Zach Brown <zach.brown@oracle.com>

net/rds/connection.c

@@ -539,6 +539,18 @@ void rds_conn_drop(struct rds_connection *conn)
 }
 EXPORT_SYMBOL_GPL(rds_conn_drop);
 
+/*
+ * If the connection is down, trigger a connect. We may have scheduled a
+ * delayed reconnect however - in this case we should not interfere.
+ */
+void rds_conn_connect_if_down(struct rds_connection *conn)
+{
+	if (rds_conn_state(conn) == RDS_CONN_DOWN &&
+	    !test_and_set_bit(RDS_RECONNECT_PENDING, &conn->c_flags))
+		queue_delayed_work(rds_wq, &conn->c_conn_w, 0);
+}
+EXPORT_SYMBOL_GPL(rds_conn_connect_if_down);
+
 /*
  * An error occurred on the connection
  */

net/rds/rds.h

@@ -617,6 +617,7 @@ void rds_conn_shutdown(struct rds_connection *conn);
 void rds_conn_destroy(struct rds_connection *conn);
 void rds_conn_reset(struct rds_connection *conn);
 void rds_conn_drop(struct rds_connection *conn);
+void rds_conn_connect_if_down(struct rds_connection *conn);
 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
 			  struct rds_info_iterator *iter,
 			  struct rds_info_lengths *lens,

net/rds/send.c

@@ -1036,13 +1036,7 @@ int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 		goto out;
 	}
 
-	/* If the connection is down, trigger a connect. We may
-	 * have scheduled a delayed reconnect however - in this case
-	 * we should not interfere.
-	 */
-	if (rds_conn_state(conn) == RDS_CONN_DOWN &&
-	    !test_and_set_bit(RDS_RECONNECT_PENDING, &conn->c_flags))
-		queue_delayed_work(rds_wq, &conn->c_conn_w, 0);
+	rds_conn_connect_if_down(conn);
 
 	ret = rds_cong_wait(conn->c_fcong, dport, nonblock, rs);
 	if (ret) {
@@ -1122,13 +1116,7 @@ rds_send_pong(struct rds_connection *conn, __be16 dport)
 	rm->m_daddr = conn->c_faddr;
 	rm->data.op_active = 1;
 
-	/* If the connection is down, trigger a connect. We may
-	 * have scheduled a delayed reconnect however - in this case
-	 * we should not interfere.
-	 */
-	if (rds_conn_state(conn) == RDS_CONN_DOWN &&
-	    !test_and_set_bit(RDS_RECONNECT_PENDING, &conn->c_flags))
-		queue_delayed_work(rds_wq, &conn->c_conn_w, 0);
+	rds_conn_connect_if_down(conn);
 
 	ret = rds_cong_wait(conn->c_fcong, dport, 1, NULL);
 	if (ret)