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>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 68bee813dfad..75b5dd2c9267 100644
--- 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);
         }