The home side dominated from the off and were never seriously tested by Darren Ferguson's men.
McGinn then went close to scoring with a low drive which beat Olejnik but came back off the keeper's right-hand post. Billy Paynter, following up, shot straight at Olejnik.
As the home side continued to press, Shaun Miller made a good run into the area before firing over.
Davies (47) struck the opener with a superbly flighted free-kick over the defensive wall - the ball going into the top right-hand corner of Olejnik's net.
After McGinn fired off-target from a good position and Conor Coady shot just over, substitute Porter (88) added a second goal with a good finish after being sent clear through the middle.
- Sports & Recreation
- Stephen McGinn
- Darren Ferguson
- Callum McFadzean