diff options
| author | Nikhil P. Rao <nikhil.rao@amd.com> | 2026-07-14 20:41:45 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-07-21 12:45:17 -0700 |
| commit | dd6b1cc748cd28147c113f9daa76393916ad9494 (patch) | |
| tree | aa9ac894cf83476d10a1ccdb28e84ce808f3c480 /tools/perf/scripts/python/stackcollapse.py | |
| parent | a11f0b8a204296fe7db9eaec53441012222cb004 (diff) | |
pds_core: order completion reads after the ownership check
pdsc_process_adminq() and pdsc_process_notifyq() decide a completion is
valid from its ownership field - the color bit for the adminq, the event
id for the notifyq - then read the rest of the descriptor, with no
barrier in between.
On a weakly ordered architecture the CPU may read the payload first. Add
dma_rmb() between the ownership read and the payload reads.
Fixes: 7e82a8745b95 ("pds_core: Prevent race issues involving the adminq")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Closes: https://sashiko.dev/#/patchset/20260629200358.2626129-1-nikhil.rao%40amd.com?part=2
Signed-off-by: Nikhil P. Rao <nikhil.rao@amd.com>
Reviewed-by: Eric Joyner <eric.joyner@amd.com>
Link: https://patch.msgid.link/20260714204145.1782390-1-nikhil.rao@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions