ath9k: Cache BSS information

Using the BSS information stored in mac80211 directly
is racy in certain conditions. For example, in a MCC
setup, if the scheduler is switching channels when
a local deauth is issued, calculation of the opmode/bssid
etc. is incorrect. To avoid this, store the bss params
in the driver and use it.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 8cd116e..d2a1ee1 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -585,6 +585,11 @@ void ath9k_release_buffered_frames(struct ieee80211_hw *hw,
 struct ath_vif {
        struct list_head list;
 
+       /* BSS info */
+       u8 bssid[ETH_ALEN];
+       u16 aid;
+       bool assoc;
+
        struct ieee80211_vif *vif;
        struct ath_node mcast_node;
        int av_bslot;

diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c
index 77c99eb..b93f83c 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/channel.c
+++ b/drivers/net/wireless/ath/ath9k/channel.c
@@ -211,7 +211,7 @@ void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
                switch (vif->type) {
                case NL80211_IFTYPE_P2P_CLIENT:
                case NL80211_IFTYPE_STATION:
-                       if (vif->bss_conf.assoc)
+                       if (avp->assoc)
                                active = true;
                        break;
                default:
@@ -917,7 +917,7 @@ ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp,
 
        switch (vif->type) {
        case NL80211_IFTYPE_STATION:
-               if (!vif->bss_conf.assoc)
+               if (!avp->assoc)
                        return false;
 
                skb = ieee80211_nullfunc_get(sc->hw, vif);
@@ -1339,7 +1339,7 @@ void ath9k_p2p_ps_timer(void *priv)
        rcu_read_lock();
 
        vif = avp->vif;
-       sta = ieee80211_find_sta(vif, vif->bss_conf.bssid);
+       sta = ieee80211_find_sta(vif, avp->bssid);
        if (!sta)
                goto out;
 

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 3e485f7..78fc539 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -898,6 +898,7 @@ static bool ath9k_uses_beacons(int type)
 static void ath9k_vif_iter(struct ath9k_vif_iter_data *iter_data,
                           u8 *mac, struct ieee80211_vif *vif)
 {
+       struct ath_vif *avp = (struct ath_vif *)vif->drv_priv;
        int i;
 
        if (iter_data->has_hw_macaddr) {
@@ -918,7 +919,7 @@ static void ath9k_vif_iter(struct ath9k_vif_iter_data *iter_data,
                break;
        case NL80211_IFTYPE_STATION:
                iter_data->nstations++;
-               if (vif->bss_conf.assoc && !iter_data->primary_sta)
+               if (avp->assoc && !iter_data->primary_sta)
                        iter_data->primary_sta = vif;
                break;
        case NL80211_IFTYPE_ADHOC:
@@ -963,13 +964,13 @@ static void ath9k_set_assoc_state(struct ath_softc *sc,
                                  struct ieee80211_vif *vif, bool changed)
 {
        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
-       struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
+       struct ath_vif *avp = (struct ath_vif *)vif->drv_priv;
        unsigned long flags;
 
        set_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags);
 
-       ether_addr_copy(common->curbssid, bss_conf->bssid);
-       common->curaid = bss_conf->aid;
+       ether_addr_copy(common->curbssid, avp->bssid);
+       common->curaid = avp->aid;
        ath9k_hw_write_associd(sc->sc_ah);
 
        if (changed) {
@@ -1698,6 +1699,10 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
                ath_dbg(common, CONFIG, "BSSID %pM Changed ASSOC %d\n",
                        bss_conf->bssid, bss_conf->assoc);
 
+               ether_addr_copy(avp->bssid, bss_conf->bssid);
+               avp->aid = bss_conf->aid;
+               avp->assoc = bss_conf->assoc;
+
                ath9k_calculate_summary_state(sc, avp->chanctx);
 
                if (ath9k_is_chanctx_enabled()) {