[RFC 4/9] mac80211: fix sdata->radar_required locking

[Michal Kazior <michal.kazior@xxxxxxxxx>]

radar_required setting wasn't protected by
local->mtx in some places. This should prevent
from scanning/radar detection/roc colliding.

Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
---
 net/mac80211/cfg.c  | 4 ++--
 net/mac80211/ibss.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 2ab5f49..ef679de 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -970,9 +970,9 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
 	/* TODO: make hostapd tell us what it wants */
 	sdata->smps_mode = IEEE80211_SMPS_OFF;
 	sdata->needed_rx_chains = sdata->local->rx_chains;
-	sdata->radar_required = params->radar_required;
 
 	mutex_lock(&local->mtx);
+	sdata->radar_required = params->radar_required;
 	err = ieee80211_vif_use_channel(sdata, &params->chandef,
 					IEEE80211_CHANCTX_SHARED);
 	mutex_unlock(&local->mtx);
@@ -3018,8 +3018,8 @@ void ieee80211_csa_finalize_work(struct work_struct *work)
 	if (!ieee80211_sdata_running(sdata))
 		goto unlock;
 
-	sdata->radar_required = sdata->csa_radar_required;
 	mutex_lock(&local->mtx);
+	sdata->radar_required = sdata->csa_radar_required;
 	err = ieee80211_vif_change_channel(sdata, &changed);
 	mutex_unlock(&local->mtx);
 	if (WARN_ON(err < 0))
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 5b9c95a..d1dc641 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -303,6 +303,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 		mutex_unlock(&local->mtx);
 		return;
 	}
+	sdata->radar_required = radar_required;
 	mutex_unlock(&local->mtx);
 
 	memcpy(ifibss->bssid, bssid, ETH_ALEN);
@@ -318,7 +319,6 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 	rcu_assign_pointer(ifibss->presp, presp);
 	mgmt = (void *)presp->head;
 
-	sdata->radar_required = radar_required;
 	sdata->vif.bss_conf.enable_beacon = true;
 	sdata->vif.bss_conf.beacon_int = beacon_int;
 	sdata->vif.bss_conf.basic_rates = basic_rates;
-- 
1.8.4.rc3

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