On Mon, 08 Oct 2012 11:08:06 -0600 Shuah Khan <shuah.khan@xxxxxx> wrote: > Add dma-debug interface debug_dma_mapping_error() to debug drivers that fail > to check dma mapping errors on addresses returned by dma_map_single() and > dma_map_page() interfaces. This interface clears a flag set by > debug_dma_map_page() to indicate that dma_mapping_error() has been called by > the driver. When driver does unmap, debug_dma_unmap() checks the flag and if > this flag is still set, prints warning message that includes call trace that > leads up to the unmap. This interface can be called from dma_mapping_error() > routines to enable dma mapping error check debugging. > > Tested: Intel iommu and swiotlb (iommu=soft) on x86-64 with > CONFIG_DMA_API_DEBUG enabled and disabled. > > Signed-off-by: Shuah Khan <shuah.khan@xxxxxx> > --- > Documentation/DMA-API.txt | 12 ++++++ > arch/x86/include/asm/dma-mapping.h | 1 + > include/linux/dma-debug.h | 7 ++++ > lib/dma-debug.c | 71 ++++++++++++++++++++++++++++++++++-- Third time lucky ... we still haven't fixed Documentation/DMA-API-HOWTO.txt! Please, go through it and update it to show people how to correctly use these APIs. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
