Messages in this thread Patch in this message | | | Date | Mon, 8 Mar 2010 15:54:36 +0900 | Subject | [PATCH] Documentation: fix block/biodoc.txt dma mapping description | From | FUJITA Tomonori <> |
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- It looks incorrect to use blk_rq_map_sg with pci_map_page here about DMA mappings. dma_map_sg?
- better to use dma_map_page instead of pci_map_page. http://marc.info/?l=linux-kernel&m=126596737604808&w=2
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> --- Documentation/block/biodoc.txt | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt index 6fab97e..508b5b2 100644 --- a/Documentation/block/biodoc.txt +++ b/Documentation/block/biodoc.txt @@ -1162,8 +1162,8 @@ where a driver received a request ala this before: As mentioned, there is no virtual mapping of a bio. For DMA, this is not a problem as the driver probably never will need a virtual mapping. -Instead it needs a bus mapping (pci_map_page for a single segment or -use blk_rq_map_sg for scatter gather) to be able to ship it to the driver. For +Instead it needs a bus mapping (dma_map_page for a single segment or +use dma_map_sg for scatter gather) to be able to ship it to the driver. For PIO drivers (or drivers that need to revert to PIO transfer once in a while (IDE for example)), where the CPU is doing the actual data transfer a virtual mapping is needed. If the driver supports highmem I/O, -- 1.6.5
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