Sven Eckelmann <sven@xxxxxxxxxxxxx> wrote:
> The QCA4019 hw1.0 firmware 10.4-3.2.1-00050 and 10.4-3.5.3-00053 (and most
> likely all other) seem to ignore the WMI_CHAN_FLAG_DFS flag during the
> scan. This results in transmission (probe requests) on channels which are
> not "available" for transmissions.
>
> Since the firmware is closed source and nothing can be done from our side
> to fix the problem in it, the driver has to work around this problem. The
> WMI_CHAN_FLAG_PASSIVE seems to be interpreted by the firmware to not
> scan actively on a channel unless an AP was detected on it. Simple probe
> requests will then be transmitted by the STA on the channel.
>
> ath10k must therefore also use this flag when it queues a radar channel for
> scanning. This should reduce the chance of an active scan when the channel
> might be "unusable" for transmissions.
>
> Fixes: e8a50f8ba44b ("ath10k: introduce DFS implementation")
> Signed-off-by: Sven Eckelmann <sven.eckelmann@xxxxxxxxxxxx>
> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Patch applied to ath-next branch of ath.git, thanks.
3f2591115838 ath10k: prevent active scans on potential unusable channels
--
https://patchwork.kernel.org/patch/10545939/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
