how to switchback from slave to master (no replies)

Hi Masters out there......

MySQL version : 5.6.27
Master server : x.x.x.236
Slave server : x.x.x.237

Replication status : OK
Switch Over from Master to Slave : OK
Current status Master : MySQL is stop

My question is, how to fallback or switch back to Master?

Below are steps taken to perform switch back from Master to Slave :

---------------------------------------------------------------------
#At Master
-Stop MySQL at master

#At Slave
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)

mysql> reset slave;
Query OK, 0 rows affected (0.03 sec)

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: x.x.x.236
Master_User: repl_user
Master_Port: 3306
Connect_Retry: 60
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: repldb-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: No
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 0
Relay_Log_Space: 174
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 1769aa95-762f-11e5-902f-38eaa7128f04
Master_Info_File: /mysql/mysql-5.6.27/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 1769aa95-762f-11e5-902f-38eaa7128f04:61-86
Auto_Position: 0
1 row in set (0.00 sec)