wifi: ath12k: Attempting MLO with main (6.15.rc7) for NCM865 / WCN7850 in station mode leads to crash/backtrace

[Baochen Qiang]

On 6/3/2025 11:01 AM, Baochen Qiang wrote:
>> - The vanilla v6.15 kernel gets a MLO connection but lost the ability to see 6 GHz, so MLO is limited to band 2.4 + 5 GHz
> This is a known iusse and the fix has landed in latest mianline kernel, could you have a try?
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?
> id=d662c14a51910ba0ad66afd248b601ba30b9f7f1
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?
> id=37e775a0a9d79a031d28d9e21480f99f448e9215
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?
> id=886bb3624e4c9914a943b63fcfdf30b8d2f2b66e

Forget to say, WCN7850 firmware support no more than 2 links in an MLO connection.
Currently host does not limit on the number of MLO links, that said, with above 3 patches
applied you will see all 3 links, and then a firmware crash is expected. Well... there
might be resulting kernel crash as well.

We have a series pending review which add limit on the number of links could be finally
established:

https://patchwork.kernel.org/project/linux-wireless/cover/20250522-ath12k-sbs-dbs-v1-0-54a29e7a3a88@quicinc.com/