What is Brown v. Davenport?

Brown v. Davenport, 596 U.S. ___ , was a case decided by the United States Supreme Court. The case concerned whether habeas relief may be granted if the Brecht v. Abrahamson test alone is satisfied, or if the application of Chapman v. California by the state courts was unreasonable because of AEDPA. The court held that federal courts can not grant habeas relief when state courts have already ruled on a prisoner's claim, unless the situation satisfies the test laid out in Brecht v. Abrahamson, and the test laid out in AEDPA.