4.9 Kernel panic on ACS and intermittent ability to host AP

[Chris Price]

> You might want to apply this one - https://patchwork.kernel.org/patch/9486941/

> As mentioned, please try the new firmware again.

This has been working for me so far (patch + new firmware). The only
unusual behaviour I've seen is that the 5 GHz AP seems to fail to
start on the first try after boot, but then works thereafter.
Obviously this can be worked around. I have yet to see a panic.