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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2010-03-10 15:23:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-12 15:52:40 -0800
commit9705ef7ec8c67a62474291bb4b235927bdf702db (patch)
tree8669ef53a193398ab1a4be4be6778efc05feaa0b /Documentation/ioctl
parent039956e9199b71ea673954e025f52f319110ca58 (diff)
DMA-API.txt: add dma_sync_single/sg API description
This adds the description of the following eight function: dma_sync_single_for_cpu pci_dma_sync_single_for_cpu dma_sync_single_for_device pci_dma_sync_single_for_device dma_sync_sg_for_cpu pci_dma_sync_sg_for_cpu dma_sync_sg_for_device pci_dma_sync_sg_for_device It was unclear that the API permits a partial sync (some network drivers already do though). I made it clear that the sync_single API can do a partial sync but the sync_sg API can't. We could do a partial sync with the sync_sg API too, however, it's difficult for driver writers to correctly use the sync_sg API for a partial sync since the scatterlists passed in to the mapping API can't be modified. It's unlikely that driver writers want to do a partial sync with the sync_sg API (because the sync_sg API are usually used for block drivers). So I think that it's better to forbid a partial sync with the sync_sg API. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: David Miller <davem@davemloft.net> Acked-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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