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| author | Ingo Molnar <mingo@elte.hu> | 2008-12-03 12:54:45 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-03 12:54:45 +0100 |
| commit | c36910c147fd7b129a8f1269c76b9767c99de5cd (patch) | |
| tree | 29403cd341b62581718f6b34944271980fb133e6 /Documentation/DMA-API.txt | |
| parent | 70d7d357578245f1993fd2d3ccd26088bcd38941 (diff) | |
| parent | 09ee17eb8ea89514c13980c4010bdbbaea8630c2 (diff) | |
| download | talos-op-linux-c36910c147fd7b129a8f1269c76b9767c99de5cd.tar.gz talos-op-linux-c36910c147fd7b129a8f1269c76b9767c99de5cd.zip | |
Merge branch 'iommu-fixes-2.6.28' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into x86/urgent
Diffstat (limited to 'Documentation/DMA-API.txt')
| -rw-r--r-- | Documentation/DMA-API.txt | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt index b8e86460046e..b462bb149543 100644 --- a/Documentation/DMA-API.txt +++ b/Documentation/DMA-API.txt @@ -316,12 +316,10 @@ reduce current DMA mapping usage or delay and try again later). pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction) -Maps a scatter gather list from the block layer. - Returns: the number of physical segments mapped (this may be shorter -than <nents> passed in if the block layer determines that some -elements of the scatter/gather list are physically adjacent and thus -may be mapped with a single entry). +than <nents> passed in if some elements of the scatter/gather list are +physically or virtually adjacent and an IOMMU maps them with a single +entry). Please note that the sg cannot be mapped again if it has been mapped once. The mapping process is allowed to destroy information in the sg. |
