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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2010-03-08 09:11:07 +0100
committerJens Axboe <jens.axboe@oracle.com>2010-03-08 09:11:07 +0100
commitc2282adbdea3548ae0271c1b1b2deec5f56ad224 (patch)
tree4ec229dd06560dfc3bb38797e32a78bb47adfa0e /Documentation/block
parent8bf8c376ab2eefaf0386f4e003e720e1434fa43d (diff)
downloadlinux-linaro-stable-c2282adbdea3548ae0271c1b1b2deec5f56ad224.tar.gz
Documentation: fix block/biodoc.txt dma mapping description
- 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> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'Documentation/block')
-rw-r--r--Documentation/block/biodoc.txt4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt
index 6fab97ea7e6b..508b5b2b0289 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,