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| author | Sasha Levin <sashal@kernel.org> | 2022-05-18 22:28:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-25 10:17:55 +0300 |
| commit | e2cfa7b0935c2445cd7a2919f91831a0f9821c3d (patch) | |
| tree | 586591cc91cbadf7b1523d72dc3589c7247d1f08 /Documentation/core-api | |
| parent | fe5ac3da50a92764bd534a39f851c744f0d4e2c3 (diff) | |
| download | linux-e2cfa7b0935c2445cd7a2919f91831a0f9821c3d.tar.xz | |
Revert "swiotlb: fix info leak with DMA_FROM_DEVICE"
This reverts commit d4d975e7921079f877f828099bb8260af335508f.
Upstream had a follow-up fix, revert, and a semi-reverted-revert.
Instead of going through this chain which is more painful to backport,
I'm just going to revert this original commit and pick the final one.
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'Documentation/core-api')
| -rw-r--r-- | Documentation/core-api/dma-attributes.rst | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/Documentation/core-api/dma-attributes.rst b/Documentation/core-api/dma-attributes.rst index 17706dc91ec9..1887d92e8e92 100644 --- a/Documentation/core-api/dma-attributes.rst +++ b/Documentation/core-api/dma-attributes.rst @@ -130,11 +130,3 @@ accesses to DMA buffers in both privileged "supervisor" and unprivileged subsystem that the buffer is fully accessible at the elevated privilege level (and ideally inaccessible or at least read-only at the lesser-privileged levels). - -DMA_ATTR_OVERWRITE ------------------- - -This is a hint to the DMA-mapping subsystem that the device is expected to -overwrite the entire mapped size, thus the caller does not require any of the -previous buffer contents to be preserved. This allows bounce-buffering -implementations to optimise DMA_FROM_DEVICE transfers. |