Make UART4 the default UART for kernel messages

[linux-beck.git] / Documentation / DMA-API-HOWTO.txt

diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt
index 781024ef90502f700baf258115c3715420fc8fb0..979228bc9035ca35463a6adfb9db2a7c9f40f9a1 100644 (file)
--- 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