If the PCIe link goes down during DMA operations, transactions may be lost and the DMA may not be able to complete. In such cases, the AXI4 interfaces will continue to operate. Outstanding read requests on the C2H Bridge AXI4 MM interface receive correct completions or completions with a slave error response. The DMA will log a link down error in the status register. It is the responsibility of the driver to have a timeout and handle recovery of a link down situation.