xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Revert "swiotlb: fix info leak with DMA_FROM_DEVICE"

Browse Source 
This reverts commit d4d975e792.

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>
This commit is contained in:
Sasha Levin
2022-05-18 15:28:18 -04:00
committed by Greg Kroah-Hartman
parent fe5ac3da50
commit e2cfa7b093
3 changed files with 1 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/core-api/dma-attributes.rst
View File

@@ -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.