iwm0 UNHANDLED error

[Mark Johnston]

On Mon, Apr 27, 2020 at 02:27:00PM +0200, Marc Veldman wrote:
> I the following error message when booting:
> 
> iwm0: frame 8/160 b800002c UNHANDLED (this should not happen)
> 
> With some debug code:
> iwm0: frame 8/160 b800002c UNHANDLED (this should not happen) Code 00ce
> 
> Any ideas?
> 
> Dmesg attached.
> 
> Best regards,
> 
> Marc Veldman

It looks like this is related to firmware support for WiFi/Bluetooth
coexistence; the firmware is passing some status information to the
driver, and iwm(4) currently drops it since it doesn't have any of iwl's
coexistence support fleshed out.

I committed a variant of your debug patch, since we should obviously be
printing the command code to begin with.