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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-03-08 09:11:07 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-03-08 09:11:07 +0100 |
| commit | c2282adbdea3548ae0271c1b1b2deec5f56ad224 (patch) | |
| tree | 4ec229dd06560dfc3bb38797e32a78bb47adfa0e /Documentation/block | |
| parent | 8bf8c376ab2eefaf0386f4e003e720e1434fa43d (diff) | |
| download | op-kernel-dev-c2282adbdea3548ae0271c1b1b2deec5f56ad224.zip op-kernel-dev-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.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, |
