From cc901de1bcb0372583466075bfa62e3049dc6288 Mon Sep 17 00:00:00 2001 From: Michal Kazior Date: Wed, 29 Jan 2014 07:56:20 +0100 Subject: [PATCH] mac80211: fix sdata->radar_required locking 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 Signed-off-by: Johannes Berg --- net/mac80211/cfg.c | 4 ++-- net/mac80211/chan.c | 2 ++ net/mac80211/ibss.c | 2 +- 3 files changed, 5 insertions(+), 3 deletions(-) diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index b98dc8ce8e25..27fa53bfed0d 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, ¶ms->chandef, IEEE80211_CHANCTX_SHARED); mutex_unlock(&local->mtx); @@ -3002,8 +3002,8 @@ static void ieee80211_csa_finalize(struct ieee80211_sub_if_data *sdata) struct ieee80211_local *local = sdata->local; int err, changed = 0; - 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/chan.c b/net/mac80211/chan.c index f43613a97dd6..42c659229a09 100644 --- a/net/mac80211/chan.c +++ b/net/mac80211/chan.c @@ -196,6 +196,8 @@ static bool ieee80211_is_radar_required(struct ieee80211_local *local) { struct ieee80211_sub_if_data *sdata; + lockdep_assert_held(&local->mtx); + rcu_read_lock(); list_for_each_entry_rcu(sdata, &local->interfaces, list) { if (sdata->radar_required) { diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c index 82d3d14b03c5..f01d4683d473 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;