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authorDavid S. Miller <davem@davemloft.net>2008-12-02 19:50:27 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-02 19:50:27 -0800
commitaa2ba5f1082dc705745899584aac8416d710c056 (patch)
treebde0bf4aff036c6bac19a0212194ae1092afb3c9 /Documentation/DMA-API.txt
parent68024541e2e5a8f35e281daaa5068a29e2a538a5 (diff)
parentf6f7b52e2f6149d2ee365717afff315b05720162 (diff)
downloadop-kernel-dev-aa2ba5f1082dc705745899584aac8416d710c056.zip
op-kernel-dev-aa2ba5f1082dc705745899584aac8416d710c056.tar.gz
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts: drivers/net/ixgbe/ixgbe_main.c drivers/net/smc91x.c
Diffstat (limited to 'Documentation/DMA-API.txt')
-rw-r--r--Documentation/DMA-API.txt8
1 files changed, 3 insertions, 5 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
index b8e8646..b462bb1 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.
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