ha_innodb.cc:

  If AUTOCOMMIT=1, do not acquire an InnoDB table lock in LOCK TABLES; this makes porting of old MyISAM applications to InnoDB easier, since in that mode InnoDB table locks caused deadlocks very easily


sql/ha_innodb.cc:
  If AUTOCOMMIT=1, do not acquire an InnoDB table lock in LOCK TABLES; this makes porting of old MyISAM applications to InnoDB easier, since in that mode InnoDB table locks caused deadlocks very easily

sql/ha_innodb.cc

@@ -4702,7 +4702,8 @@ ha_innobase::external_lock(
 
 		if (prebuilt->select_lock_type != LOCK_NONE) {
 			if (thd->in_lock_tables &&
-			    thd->variables.innodb_table_locks) {
+			    thd->variables.innodb_table_locks &&
+			    (thd->options & OPTION_NOT_AUTOCOMMIT)) {
 				ulint	error;
 				error = row_lock_table_for_mysql(prebuilt);