ath9k_htc: Fix locking for ps_idle

ps_idle is protected by the htc_pm_lock mutex.
Use it to protect the variable.

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

diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_main.c b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
index c6ad15a..b62bfa5 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/htc_drv_main.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
@@ -1401,16 +1401,17 @@ static int ath9k_htc_config(struct ieee80211_hw *hw, u32 changed)
                bool enable_radio = false;
                bool idle = !!(conf->flags & IEEE80211_CONF_IDLE);
 
+               mutex_lock(&priv->htc_pm_lock);
                if (!idle && priv->ps_idle)
                        enable_radio = true;
-
                priv->ps_idle = idle;
+               mutex_unlock(&priv->htc_pm_lock);
 
                if (enable_radio) {
-                       ath9k_htc_setpower(priv, ATH9K_PM_AWAKE);
-                       ath9k_htc_radio_enable(hw);
                        ath_print(common, ATH_DBG_CONFIG,
                                  "not-idle: enabling radio\n");
+                       ath9k_htc_setpower(priv, ATH9K_PM_AWAKE);
+                       ath9k_htc_radio_enable(hw);
                }
        }
 
@@ -1453,14 +1454,21 @@ static int ath9k_htc_config(struct ieee80211_hw *hw, u32 changed)
                }
        }
 
-       if ((changed & IEEE80211_CONF_CHANGE_IDLE) && priv->ps_idle) {
+       if (changed & IEEE80211_CONF_CHANGE_IDLE) {
+               mutex_lock(&priv->htc_pm_lock);
+               if (!priv->ps_idle) {
+                       mutex_unlock(&priv->htc_pm_lock);
+                       goto out;
+               }
+               mutex_unlock(&priv->htc_pm_lock);
+
                ath_print(common, ATH_DBG_CONFIG,
                          "idle: disabling radio\n");
                ath9k_htc_radio_disable(hw);
        }
 
+out:
        mutex_unlock(&priv->mutex);
-
        return 0;
 }