On Sun, 2015-12-27 at 12:28 +0100, Toralf Förster wrote:

Yesterday I got this warning for the first time while using WLAN in a
train, I'm unsure if this warning is worth to be reported or not :

Definitely worth it, thanks!

Dec 26 20:26:48 t44 kernel: [45827.647635] cfg80211:   (5490000 KHz -
5710000 KHz @ 160000 KHz), (N/A, 2700 mBm), (0 s)
Dec 26 20:26:48 t44 kernel: [45827.647637] cfg80211:   (57000000 KHz
- 66000000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
Dec 26 20:26:48 t44 kernel: [45827.700734] ------------[ cut here ]
------------
Dec 26 20:26:48 t44 kernel: [45827.700762] WARNING: CPU: 0 PID: 1498
at net/mac80211/driver-ops.h:647 ieee80211_sta_wmm_params+0x3f7/0x410
[mac80211]()
Dec 26 20:26:48 t44 kernel: [45827.700764] wlp3s0: invalid
CW_min/CW_max: 127/3

Ugly. I once met a guy who worked on the train AP network, should dig
up his contact info ...

In the meantime, we should catch this bug at a higher layer and do ...
something. But what exactly? Use default WMM parameters like we usually
do in cases like this?


johannes