diff options
| author | Benjamin Li <benl@squareup.com> | 2021-10-22 17:15:28 -0700 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2021-10-27 10:44:16 +0300 |
| commit | 9bfe38e064af5decba2ffce66a2958ab8b10eaa4 (patch) | |
| tree | 24a4d52bbfeb32476ff5e581c07c5529d7efd2b3 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 960ae77f25631bbe4e3aafefe209b52e044baf31 (diff) | |
wcn36xx: add proper DMA memory barriers in rx path
This is essentially exactly following the dma_wmb()/dma_rmb() usage
instructions in Documentation/memory-barriers.txt.
The theoretical races here are:
1. DXE (the DMA Transfer Engine in the Wi-Fi subsystem) seeing the
dxe->ctrl & WCN36xx_DXE_CTRL_VLD write before the dxe->dst_addr_l
write, thus performing DMA into the wrong address.
2. CPU reading dxe->dst_addr_l before DXE unsets dxe->ctrl &
WCN36xx_DXE_CTRL_VLD. This should generally be harmless since DXE
doesn't write dxe->dst_addr_l (no risk of freeing the wrong skb).
Fixes: 8e84c2582169 ("wcn36xx: mac80211 driver for Qualcomm WCN3660/WCN3680 hardware")
Signed-off-by: Benjamin Li <benl@squareup.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211023001528.3077822-1-benl@squareup.com
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions