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| author | Ingo Molnar <mingo@elte.hu> | 2008-12-17 00:53:53 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-17 00:53:53 +0300 |
| commit | c15cb37cc4e9809624411333b96109ddf770e29c (patch) | |
| tree | 3d4dbb48d97d5df9096ad815b99b20660cdc1bbf /Documentation/DMA-API.txt | |
| parent | 77be80e437fec44f8b7a620314b7d7b605b8d93b (diff) | |
| parent | 8b1fae4e4200388b64dd88065639413cb3f1051c (diff) | |
| download | linux-c15cb37cc4e9809624411333b96109ddf770e29c.tar.xz | |
Merge commit 'v2.6.28-rc8' into x86/uv
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. |