ath9k: Lock mac80211 callbacks with a mutex

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

diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 1c0f893..9b040ba 100644 (file)
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -1938,6 +1938,8 @@ static int ath9k_start(struct ieee80211_hw *hw)
        DPRINTF(sc, ATH_DBG_CONFIG, "Starting driver with "
                "initial channel: %d MHz\n", curchan->center_freq);
 
+       mutex_lock(&sc->mutex);
+
        /* setup initial channel */
 
        pos = curchan->hw_value;
@@ -1963,7 +1965,7 @@ static int ath9k_start(struct ieee80211_hw *hw)
                        "(freq %u MHz)\n", r,
                        curchan->center_freq);
                spin_unlock_bh(&sc->sc_resetlock);
-               return r;
+               goto mutex_unlock;
        }
        spin_unlock_bh(&sc->sc_resetlock);
 
@@ -1983,7 +1985,8 @@ static int ath9k_start(struct ieee80211_hw *hw)
        if (ath_startrecv(sc) != 0) {
                DPRINTF(sc, ATH_DBG_FATAL,
                        "Unable to start recv logic\n");
-               return -EIO;
+               r = -EIO;
+               goto mutex_unlock;
        }
 
        /* Setup our intr mask. */
@@ -2010,6 +2013,10 @@ static int ath9k_start(struct ieee80211_hw *hw)
 #if defined(CONFIG_RFKILL) || defined(CONFIG_RFKILL_MODULE)
        r = ath_start_rfkill_poll(sc);
 #endif
+
+mutex_unlock:
+       mutex_unlock(&sc->mutex);
+
        return r;
 }
 
@@ -2074,7 +2081,7 @@ static void ath9k_stop(struct ieee80211_hw *hw)
                return;
        }
 
-       DPRINTF(sc, ATH_DBG_CONFIG, "Cleaning up\n");
+       mutex_lock(&sc->mutex);
 
        ieee80211_stop_queues(sc->hw);
 
@@ -2099,6 +2106,8 @@ static void ath9k_stop(struct ieee80211_hw *hw)
 
        sc->sc_flags |= SC_OP_INVALID;
 
+       mutex_unlock(&sc->mutex);
+
        DPRINTF(sc, ATH_DBG_CONFIG, "Driver halt\n");
 }
 
@@ -2114,6 +2123,8 @@ static int ath9k_add_interface(struct ieee80211_hw *hw,
        if (sc->sc_nvaps)
                return -ENOBUFS;
 
+       mutex_lock(&sc->mutex);
+
        switch (conf->type) {
        case NL80211_IFTYPE_STATION:
                ic_opmode = NL80211_IFTYPE_STATION;
@@ -2173,6 +2184,8 @@ static int ath9k_add_interface(struct ieee80211_hw *hw,
                          jiffies + msecs_to_jiffies(ATH_ANI_POLLINTERVAL));
        }
 
+       mutex_unlock(&sc->mutex);
+
        return 0;
 }
 
@@ -2184,6 +2197,8 @@ static void ath9k_remove_interface(struct ieee80211_hw *hw,
 
        DPRINTF(sc, ATH_DBG_CONFIG, "Detach Interface\n");
 
+       mutex_lock(&sc->mutex);
+
        /* Stop ANI */
        del_timer_sync(&sc->sc_ani.timer);
 
@@ -2198,6 +2213,8 @@ static void ath9k_remove_interface(struct ieee80211_hw *hw,
 
        sc->sc_vaps[0] = NULL;
        sc->sc_nvaps--;
+
+       mutex_unlock(&sc->mutex);
 }
 
 static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
@@ -2206,6 +2223,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
        struct ieee80211_conf *conf = &hw->conf;
 
        mutex_lock(&sc->mutex);
+
        if (changed & IEEE80211_CONF_CHANGE_PS) {
                if (conf->flags & IEEE80211_CONF_PS) {
                        if ((sc->sc_imask & ATH9K_INT_TIM_TIMER) == 0) {
@@ -2250,6 +2268,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
                sc->sc_config.txpowlimit = 2 * conf->power_level;
 
        mutex_unlock(&sc->mutex);
+
        return 0;
 }
 
@@ -2392,8 +2411,7 @@ static void ath9k_sta_notify(struct ieee80211_hw *hw,
        }
 }
 
-static int ath9k_conf_tx(struct ieee80211_hw *hw,
-                        u16 queue,
+static int ath9k_conf_tx(struct ieee80211_hw *hw, u16 queue,
                         const struct ieee80211_tx_queue_params *params)
 {
        struct ath_softc *sc = hw->priv;
@@ -2403,6 +2421,8 @@ static int ath9k_conf_tx(struct ieee80211_hw *hw,
        if (queue >= WME_NUM_AC)
                return 0;
 
+       mutex_lock(&sc->mutex);
+
        qi.tqi_aifs = params->aifs;
        qi.tqi_cwmin = params->cw_min;
        qi.tqi_cwmax = params->cw_max;
@@ -2419,6 +2439,8 @@ static int ath9k_conf_tx(struct ieee80211_hw *hw,
        if (ret)
                DPRINTF(sc, ATH_DBG_FATAL, "TXQ Update failed\n");
 
+       mutex_unlock(&sc->mutex);
+
        return ret;
 }
 
@@ -2431,6 +2453,7 @@ static int ath9k_set_key(struct ieee80211_hw *hw,
        struct ath_softc *sc = hw->priv;
        int ret = 0;
 
+       mutex_lock(&sc->mutex);
        ath9k_ps_wakeup(sc);
        DPRINTF(sc, ATH_DBG_KEYCACHE, "Set HW Key\n");
 
@@ -2456,6 +2479,8 @@ static int ath9k_set_key(struct ieee80211_hw *hw,
        }
 
        ath9k_ps_restore(sc);
+       mutex_unlock(&sc->mutex);
+
        return ret;
 }
 
@@ -2466,6 +2491,8 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
 {
        struct ath_softc *sc = hw->priv;
 
+       mutex_lock(&sc->mutex);
+
        if (changed & BSS_CHANGED_ERP_PREAMBLE) {
                DPRINTF(sc, ATH_DBG_CONFIG, "BSS Changed PREAMBLE %d\n",
                        bss_conf->use_short_preamble);
@@ -2490,15 +2517,18 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
                        bss_conf->assoc);
                ath9k_bss_assoc_info(sc, vif, bss_conf);
        }
+
+       mutex_unlock(&sc->mutex);
 }
 
 static u64 ath9k_get_tsf(struct ieee80211_hw *hw)
 {
        u64 tsf;
        struct ath_softc *sc = hw->priv;
-       struct ath_hal *ah = sc->sc_ah;
 
-       tsf = ath9k_hw_gettsf64(ah);
+       mutex_lock(&sc->mutex);
+       tsf = ath9k_hw_gettsf64(sc->sc_ah);
+       mutex_unlock(&sc->mutex);
 
        return tsf;
 }
@@ -2506,23 +2536,25 @@ static u64 ath9k_get_tsf(struct ieee80211_hw *hw)
 static void ath9k_set_tsf(struct ieee80211_hw *hw, u64 tsf)
 {
        struct ath_softc *sc = hw->priv;
-       struct ath_hal *ah = sc->sc_ah;
 
-       ath9k_hw_settsf64(ah, tsf);
+       mutex_lock(&sc->mutex);
+       ath9k_hw_settsf64(sc->sc_ah, tsf);
+       mutex_unlock(&sc->mutex);
 }
 
 static void ath9k_reset_tsf(struct ieee80211_hw *hw)
 {
        struct ath_softc *sc = hw->priv;
-       struct ath_hal *ah = sc->sc_ah;
 
-       ath9k_hw_reset_tsf(ah);
+       mutex_lock(&sc->mutex);
+       ath9k_hw_reset_tsf(sc->sc_ah);
+       mutex_unlock(&sc->mutex);
 }
 
 static int ath9k_ampdu_action(struct ieee80211_hw *hw,
-                      enum ieee80211_ampdu_mlme_action action,
-                      struct ieee80211_sta *sta,
-                      u16 tid, u16 *ssn)
+                             enum ieee80211_ampdu_mlme_action action,
+                             struct ieee80211_sta *sta,
+                             u16 tid, u16 *ssn)
 {
        struct ath_softc *sc = hw->priv;
        int ret = 0;