On 6/5/2025 12:24 AM, Jeff Johnson wrote:
On 6/3/2025 7:34 PM, Miaoqing Pan wrote:
We previously had extensive discussions on this topic in the
https://lore.kernel.org/linux-wireless/ecfe850c-b263-4bee-b888-c34178e690fc@xxxxxxxxxxx/
thread. On my platform, dma_rmb() did not work as expected. The issue
only disappeared after disabling PCIe endpoint relaxed ordering in
firmware side. So it seems that HP was updated (Memory write) before
descriptor (Memory write), which led to the problem.
Have all ath11k and ath12k firmware been updated to prevent this problem from
the firmware side?
No, as this is not a widespread issue, and addressing it would require
modifying the core underlying modules of the firmware. Therefore, we
chose not to proceed with that approach but instead used the workaround
patch I previously submitted.
Or do we need both the barriers and the logic to retry reading the descriptor?
I think so, that would be best.
