diff options
Diffstat (limited to 'Documentation/DMA-API-HOWTO.txt')
| -rw-r--r-- | Documentation/DMA-API-HOWTO.txt | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt index 781024ef9050..979228bc9035 100644 --- a/Documentation/DMA-API-HOWTO.txt +++ b/Documentation/DMA-API-HOWTO.txt @@ -699,7 +699,7 @@ to use the dma_sync_*() interfaces. dma_addr_t mapping; mapping = dma_map_single(cp->dev, buffer, len, DMA_FROM_DEVICE); - if (dma_mapping_error(cp->dev, dma_handle)) { + if (dma_mapping_error(cp->dev, mapping)) { /* * reduce current DMA mapping usage, * delay and try again later or @@ -931,10 +931,8 @@ to "Closing". 1) Struct scatterlist requirements. - Don't invent the architecture specific struct scatterlist; just use - <asm-generic/scatterlist.h>. You need to enable - CONFIG_NEED_SG_DMA_LENGTH if the architecture supports IOMMUs - (including software IOMMU). + You need to enable CONFIG_NEED_SG_DMA_LENGTH if the architecture + supports IOMMUs (including software IOMMU). 2) ARCH_DMA_MINALIGN |