Author: Amitoj Kaur Chawla <amitoj1606@gmail.com> Currently, DMA mapping failure is not detected, causing the hardware to attempt a DMA from an invalid address. This patch adds the corresponding error check for pci_map_single i.e. pci_dma_mapping_error. Problem found using the following Coccinelle semantic patch: // @@ expression e1; identifier x; @@ x= ( *dma_map_single(…) | *dma_map_page(…) ) …