If the PCIe link goes down during DMA operations, transactions might be lost and the DMA might not be able to complete. In such cases, the AXI4 interfaces 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 logs 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.