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Some kinds of Layerscape PCIe controllers will forward the received message TLPs to system application address space, which could corrupt system memory or lead to a system hang. Enable MSG_DROP to fix this issue. Signed-off-by: Minghuan Lian <Minghuan.Lian@nxp.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>