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NonCoherentIoMmuSetAttribute() does nothing except return EFI_UNSUPPORTED. This was fine when it was introduced, but now, the PCI bus driver will fail a PCI I/O Map() operation if the call to SetAttributes() fails. So return EFI_SUCCESS instead. Cc: Leif Lindholm <quic_llindhol@quicinc.com> Cc: Abner Chang <abner.chang@amd.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>