The patch titled
DMA-API.txt: fix description of pci_map_sg/dma_map_sg scatterlists handling
has been removed from the -mm tree. Its filename was
dma-apitxt-fix-description-of-pci_map_sg-dma_map_sg-scatterlists-handling.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: DMA-API.txt: fix description of pci_map_sg/dma_map_sg scatterlists handling
From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
- pci_map_sg/dma_map_sg are used with a scatter gather list that doesn't
come from the block layer (e.g. some network drivers do).
- how IOMMUs merge adjacent elements of the scatter/gather list is
independent of how the block layer determines sees elements.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Tejun Heo <htejun@xxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/DMA-API.txt | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff -puN Documentation/DMA-API.txt~dma-apitxt-fix-description-of-pci_map_sg-dma_map_sg-scatterlists-handling Documentation/DMA-API.txt
--- a/Documentation/DMA-API.txt~dma-apitxt-fix-description-of-pci_map_sg-dma_map_sg-scatterlists-handling
+++ a/Documentation/DMA-API.txt
@@ -316,12 +316,10 @@ reduce current DMA mapping usage or dela
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.
_
Patches currently in -mm which might be from fujita.tomonori@xxxxxxxxxxxxx are
linux-next.patch
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