Pinning Knockout...I Double What?

[Geflin Graysoul]

Pinning Knockout

Benefit: While you have an opponent pinned, when you succeed at a grapple combat maneuver check to deal an opponent nonlethal damage using an unarmed strike or a light or one-handed weapon, double your damage result. Any creature that is immune to critical hits is immune to the effects of this feat.

So assume I'm playing a Drow unarmed warrior and I've got some poor sap pinned between my weight lifter sized thighs (strong like bull). Once pinned I decide to use Pinning Knockout, see below:

Successful grapple
- unarmed damage d3+7
- armor spikes d6
- mythic uncanny grapple (crush) d6
- Anaconda's coil (constrict) d6

Do I double just the unarmed damage and add the rest as normal?

[Nefreet]

During your standard action to deal damage to a pinned opponent, double your damage result with an unarmed strike, light weapon, or one-handed weapon.

So, for example, your unarmed strike is 1d3+7, and you roll a 2.

Your result would normally be 9, but while using this feat it doubles to 18.