Whether XhcCheckUrbResult returns correct error status in case of failure? XhcCheckUrbResult function header indicates it should report URB transfer state - Urb->Finished (seems to align with EhciDxe) but the implementation is trying to return EFI_STATUS and it doesn't get updated based on EvtTrb->Completecode. With a failing drive, XhcExecTransfer returns EFI_SUCCESS in case of transaction error.
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