update doc

README.md

@@ -8,6 +8,8 @@ Package redisc implements a redis cluster client built on top of the [redigo pac
 
 ## Releases
 
+* **v1.1.7** : Do not bind to a random node if `Do` is called without a command and the connection is not already bound (thanks to [@tysonmote][tysonmote]).
+
 * **v1.1.6** : Append the actual error messages when a refresh returns "all nodes failed" error.
 
 * **v1.1.5** : Add `Cluster.PoolWaitTime` to configure the time to wait on a connection from a pool with `MaxActive` > 0 and `Wait` set to true (thanks to [@iwanbk][iwanbk]).
@@ -77,3 +79,4 @@ The [BSD 3-Clause license][bsd].
 [radix2]: https://github.com/mediocregopher/radix.v2
 [letsfire]: https://github.com/letsfire
 [iwanbk]: https://github.com/iwanbk
+[tysonmote]: https://github.com/tysonmote

conn.go

@@ -248,8 +248,13 @@ func (c *Conn) DoWithTimeout(timeout time.Duration, cmd string, args ...interfac
 	// when returning a Redis conneciton back to the pool. If we recieve the
 	// blank command, don't bind to a random node if this connection is not bound
 	// yet.
-	if cmd == "" && c.rc == nil {
-		return nil, nil
+	if cmd == "" && len(args) == 0 {
+		c.mu.Lock()
+		rc := c.rc
+		c.mu.Unlock()
+		if rc == nil {
+			return nil, nil
+		}
 	}
 
 	rc, _, err := c.bind(cmdSlot(cmd, args))