Marek Szyprowski 87ae01ac7e
dma-mapping: add generic helpers for mapping sgtable objects ...
[ Upstream commit d9d200bcebc1f6e56f0178cbb8db9953e8cc9a11 ]
struct sg_table is a common structure used for describing a memory
buffer. It consists of a scatterlist with memory pages and DMA addresses
(sgl entry), as well as the number of scatterlist entries: CPU pages
(orig_nents entry) and DMA mapped pages (nents entry).
It turned out that it was a common mistake to misuse nents and orig_nents
entries, calling DMA-mapping functions with a wrong number of entries or
ignoring the number of mapped entries returned by the dma_map_sg
function.
To avoid such issues, let's introduce a common wrappers operating
directly on the struct sg_table objects, which take care of the proper
use of the nents and orig_nents entries.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com >
Reviewed-by: Robin Murphy <robin.murphy@arm.com >
Signed-off-by: Christoph Hellwig <hch@lst.de >
Stable-dep-of: d37c120b7312 ("drm/etnaviv: don't truncate physical page address")
Signed-off-by: Sasha Levin <sashal@kernel.org >
[uli: backport to 4.19]
Signed-off-by: Ulrich Hecht <uli@kernel.org >
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