mac80211: fix radar_enabled propagation

If chandef had non-HT width it was possible for
radar_enabled update to not be propagated properly
through drv_config(). This happened because
ieee80211_hw_conf_chan() would never see different
local->hw.conf.chandef and local->_oper_chandef.

This wasn't a problem with HT chandefs because
_oper_chandef width is reset to non-HT in
ieee80211_free_chanctx() making
ieee80211_hw_conf_chan() to kick in.

This problem led (at least) ath10k to not start
CAC if prior CAC was cancelled and both CACs were
requested for identical non-HT chandefs.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 68bee813dfad08b2307beda53158b4352d00fb2c..75b5dd2c9267f10e8cb0e5680c3aa11c94a5dbe4 100644 (file)
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -249,7 +249,7 @@ ieee80211_new_chanctx(struct ieee80211_local *local,
 
        if (!local->use_chanctx) {
                local->_oper_chandef = *chandef;
-               ieee80211_hw_config(local, 0);
+               ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
        } else {
                err = drv_add_chanctx(local, ctx);
                if (err) {
@@ -286,7 +286,7 @@ static void ieee80211_free_chanctx(struct ieee80211_local *local,
                        check_single_channel = true;
                local->hw.conf.radar_enabled = false;
 
-               ieee80211_hw_config(local, 0);
+               ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
        } else {
                drv_remove_chanctx(local, ctx);
        }