Miller -- who's co-starring with Paul Rudd in the upcoming flick "The Perks of Being a Wallflower" -- was arrested for marijuana possession on June 22 when cops say Ezra was holding a "brown, vegetable material" during a routine traffic stop.

But TMZ has learned the judge agreed to dismiss the possession charge -- and instead, issued two disorderly conduct citations against the actor which ran $300-a-pop.

So far ... no word from Ezra's camp on the incident.