diff options
author | Paul Mackerras <paulus@samba.org> | 2008-12-03 20:11:06 +1100 |
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committer | Paul Mackerras <paulus@samba.org> | 2008-12-03 20:11:06 +1100 |
commit | 527491885554002837b5742202adc0ab5f536e54 (patch) | |
tree | 6d9c44776e0b4368eccd414b92b957fac3c5a4c6 /Documentation/DMA-API.txt | |
parent | cea555d384b85271035814c5adad23e6c7fc5d2a (diff) | |
parent | 2434bbb30e79468c49cff3cff6005236f55ed188 (diff) |
Merge branch 'merge'
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 b8e86460046..b462bb14954 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. |