On Fri, 09 Feb 2018 10:01:09 +0200 Kalle Valo <kvalo@xxxxxxxxxxxxxx> wrote: > Timothy Redaelli <tredaelli@xxxxxxxxxx> writes: > > > The code currently syncronize the DFS region only if curchan != 0, > > but hostapd launch DFS before the channel is set and so > > set_dfs_domain is never executed. > > > > CC: Felix Fietkau <nbd@xxxxxxxx> > > Signed-off-by: Timothy Redaelli <tredaelli@xxxxxxxxxx> > > What kind of bug does this fix? Please describe the symptoms from > user's point of view. With the current code radar detection (CAC) doesn't work on ath9k since "dpd_set_domain" is only called once with NL80211_DFS_UNSET (0) as region and so "dpd_add_pulse" always returns true (radar detected) without doing a real scan. You can test it easily with a kernel built with CONFIG_ATH9K_DFS_CERTIFIED and by using a simple hostapd configuration: interface=wlp1s0 hw_mode=a channel=acs_survey chanlist=100 104 108 112 116 120 124 128 132 136 140 ieee80211d=1 ieee80211h=1 country_code=US ieee80211n=1 wmm_enabled=1 ssid=testwifi
