Re: [BUG] wifi: rtw88: Hard system freeze on RTL8821CE when power_save is enabled (LPS/ASPM conflict)

[LB F]

Hi Bitterblue,

I've been testing your patch on my HP Notebook (SKU: P3S95EA#ACB,
board: 81F0, RTL8821CE [10ec:c821]) for the past several days.

Test environment:
- openSUSE Tumbleweed
- Kernel 6.19.12-1-default
- Patch applied via DKMS (rtw_core, rtw_8821c, rtw_pci, rtw_8821ce
  rebuilt from patched sources)

Test conditions:
- Continuous Wi-Fi use (streaming, downloads, browsing) over ~48-hour
  uninterrupted sessions, including suspend/hibernate cycles.
- Bluetooth coexistence active throughout (audio streaming
  simultaneously with Wi-Fi).
- Power save mode toggling, Wi-Fi scanning under load.
- The system previously exhibited reproducible kernel freezes caused
  by a NULL pointer dereference in rtw_fw_adaptivity_result() preceded
  by a burst of corrupted RX descriptors; those freezes are completely
  absent since applying the patch.

Results after 48+ hours of testing:
- Zero kernel oops, panics, or BUG traces.
- Zero rtw-related kernel errors of any kind (the added pr_err_once
  validations haven't triggered, effectively catching/mitigating
  bad frames without log spam).
- Zero RX/TX errors on the wireless interface (2+ GB received,
  400+ MB sent without errors).
- No system hangs or freezes.

The system has been fully stable under all tested conditions. Thank
you for the fix!

Tested-by: Oleksandr Havrylov <goainwo@xxxxxxxxx>