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| author | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2008-12-05 15:27:43 +1100 |
|---|---|---|
| committer | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2008-12-05 15:27:43 +1100 |
| commit | 14d676f56fad26fd3c31eeff5d4ef8ea4a163571 (patch) | |
| tree | 5e740c5931daecf44a6e74c230f2deb291290f4b /Documentation/DMA-API.txt | |
| parent | 797eaed40e1df4a3b9ece6894a71ce2b568bca38 (diff) | |
| parent | feaf3848a813a106f163013af6fcf6c4bfec92d9 (diff) | |
| download | linux-14d676f56fad26fd3c31eeff5d4ef8ea4a163571.tar.gz linux-14d676f56fad26fd3c31eeff5d4ef8ea4a163571.tar.bz2 linux-14d676f56fad26fd3c31eeff5d4ef8ea4a163571.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
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. |