1 Kings 2:25

2:25 King Solomon then sent Benaiah son of Jehoiada, and he killed Adonijah.

1 Kings 2:34

2:34 So Benaiah son of Jehoiada went up and executed Joab; he was buried at his home in the wilderness.

1 Kings 2:46

2:46 The king then gave the order to Benaiah son of Jehoiada who went and executed Shimei.

So Solomon took firm control of the kingdom.