From Thailand stopping in Shanghai for two nights on the way home to U.S. Eligible?

I'm flying from Phuket to San Francisco (my home), stopping in Shanghai and staying for two nights. I obviously don't need a visa to return to my own home country (or for Thailand, for that matter), and I see in the list of requirements to be eligible for the 72-hour free transit that I need an entry permit for my next destination. Not to return to my own home country, right?