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| author | Marek Szyprowski <[email protected]> | 2020-03-27 16:21:26 +0000 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2020-04-05 14:44:12 +0000 |
| commit | c0f83d164fb8f3a2b7bc379a6c1e27d1123a9eab (patch) | |
| tree | b4a240c1160ac26cd189c80fb7215b200764c7bf /drivers/firmware/psci/psci.c | |
| parent | Merge drm/drm-next into drm-misc-next-fixes (diff) | |
| download | kernel-c0f83d164fb8f3a2b7bc379a6c1e27d1123a9eab.tar.gz kernel-c0f83d164fb8f3a2b7bc379a6c1e27d1123a9eab.zip | |
drm/prime: fix extracting of the DMA addresses from a scatterlist
Scatterlist elements contains both pages and DMA addresses, but one
should not assume 1:1 relation between them. The sg->length is the size
of the physical memory chunk described by the sg->page, while
sg_dma_len(sg) is the size of the DMA (IO virtual) chunk described by
the sg_dma_address(sg).
The proper way of extracting both: pages and DMA addresses of the whole
buffer described by a scatterlist it to iterate independently over the
sg->pages/sg->length and sg_dma_address(sg)/sg_dma_len(sg) entries.
Fixes: 42e67b479eab ("drm/prime: use dma length macro when mapping sg")
Signed-off-by: Marek Szyprowski <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Cc: [email protected]
Diffstat (limited to 'drivers/firmware/psci/psci.c')
0 files changed, 0 insertions, 0 deletions