[BUG] CAC countdown timer underflow

[Becker Béla]

On 2018. május 3., csütörtök 18:08:16 CEST Becker Béla wrote:
> Hello,
> 
> This is the second time this has occured to me in a few days. When selecting a DFS channel, the 60s timer can underflow, it winds up counting from UINT32_MAX.
> I'm not able to reproduce this bug consistently, but I guess if I were to try again repeatedly it would randomly happen again.
> Is this a known issue? I couldn't find any mention of this on the web.
> 
> The module I use is a SparkLAN WPEA-128N (AR9380), on an ARM cpu, running Linux 4.9.84.

After digging around and learning more about the WiFi stack, I realize that hostapd does not change that timer, so this bug must somewhere in the ath9k or the cfg80211 drivers.