iwlwifi: change WEP key protection to use mutex

For later station notification support we would like WEP key setting to be
done synchronously always. Currently all places from which WEP key is set
can sleep, but the usage of sta_lock prevents it to do so. Modify the
locking to use priv->mutex instead and thus enable this call to sleep.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index bc84fd4a8d293d7f49c318698ac3643816aecf4a..d6e1a059b9b09cb46f947916db9e7b6730a380af 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2869,7 +2869,6 @@ static int iwl_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 
        mutex_lock(&priv->mutex);
        iwl_scan_cancel_timeout(priv, 100);
-       mutex_unlock(&priv->mutex);
 
        /* If we are getting WEP group key and we didn't receive any key mapping
         * so far, we are in legacy wep mode (group key only), otherwise we are
@@ -2905,6 +2904,7 @@ static int iwl_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                ret = -EINVAL;
        }
 
+       mutex_unlock(&priv->mutex);
        IWL_DEBUG_MAC80211(priv, "leave\n");
 
        return ret;

diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 90d2b6e0df76568ffd46188cd969e960083a6558..bac8e7cc46ce1a539dc573b68f923c9d1ed52c3e 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1220,7 +1220,7 @@ struct iwl_priv {
        spinlock_t sta_lock;
        int num_stations;
        struct iwl_station_entry stations[IWL_STATION_COUNT];
-       struct iwl_wep_key wep_keys[WEP_KEYS_MAX];
+       struct iwl_wep_key wep_keys[WEP_KEYS_MAX]; /* protected by mutex */
        u8 default_wep_key;
        u8 key_mapping_key;
        unsigned long ucode_key_table;

diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index 4a6686fa6b3649971c218bd060836ef0ba64084a..b1aad306efa9af4b9ff93a94a7f6391aaba515e3 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -549,9 +549,11 @@ int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
        struct iwl_host_cmd cmd = {
                .id = REPLY_WEPKEY,
                .data = wep_cmd,
-               .flags = CMD_ASYNC,
+               .flags = CMD_SYNC,
        };
 
+       might_sleep();
+
        memset(wep_cmd, 0, cmd_size +
                        (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
 
@@ -587,9 +589,9 @@ int iwl_remove_default_wep_key(struct iwl_priv *priv,
                               struct ieee80211_key_conf *keyconf)
 {
        int ret;
-       unsigned long flags;
 
-       spin_lock_irqsave(&priv->sta_lock, flags);
+       WARN_ON(!mutex_is_locked(&priv->mutex));
+
        IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
                      keyconf->keyidx);
 
@@ -601,13 +603,12 @@ int iwl_remove_default_wep_key(struct iwl_priv *priv,
        memset(&priv->wep_keys[keyconf->keyidx], 0, sizeof(priv->wep_keys[0]));
        if (iwl_is_rfkill(priv)) {
                IWL_DEBUG_WEP(priv, "Not sending REPLY_WEPKEY command due to RFKILL.\n");
-               spin_unlock_irqrestore(&priv->sta_lock, flags);
+               /* but keys in device are clear anyway so return success */
                return 0;
        }
        ret = iwl_send_static_wepkey_cmd(priv, 1);
        IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
                      keyconf->keyidx, ret);
-       spin_unlock_irqrestore(&priv->sta_lock, flags);
 
        return ret;
 }
@@ -617,7 +618,8 @@ int iwl_set_default_wep_key(struct iwl_priv *priv,
                            struct ieee80211_key_conf *keyconf)
 {
        int ret;
-       unsigned long flags;
+
+       WARN_ON(!mutex_is_locked(&priv->mutex));
 
        if (keyconf->keylen != WEP_KEY_LEN_128 &&
            keyconf->keylen != WEP_KEY_LEN_64) {
@@ -629,12 +631,11 @@ int iwl_set_default_wep_key(struct iwl_priv *priv,
        keyconf->hw_key_idx = HW_KEY_DEFAULT;
        priv->stations[IWL_AP_ID].keyinfo.alg = ALG_WEP;
 
-       spin_lock_irqsave(&priv->sta_lock, flags);
        priv->default_wep_key++;
 
        if (test_and_set_bit(keyconf->keyidx, &priv->ucode_key_table))
                IWL_ERR(priv, "index %d already used in uCode key table.\n",
-                       keyconf->keyidx);
+                         keyconf->keyidx);
 
        priv->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
        memcpy(&priv->wep_keys[keyconf->keyidx].key, &keyconf->key,
@@ -643,7 +644,6 @@ int iwl_set_default_wep_key(struct iwl_priv *priv,
        ret = iwl_send_static_wepkey_cmd(priv, 0);
        IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
                keyconf->keylen, keyconf->keyidx, ret);
-       spin_unlock_irqrestore(&priv->sta_lock, flags);
 
        return ret;
 }

diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index 2fd1b3d4949aa4afe06d8d83f1f006eac7197664..dd33251d69187b66d7863d10e6341f792f76cc76 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -3344,7 +3344,6 @@ static int iwl3945_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 
        mutex_lock(&priv->mutex);
        iwl_scan_cancel_timeout(priv, 100);
-       mutex_unlock(&priv->mutex);
 
        switch (cmd) {
        case SET_KEY:
@@ -3365,6 +3364,7 @@ static int iwl3945_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                ret = -EINVAL;
        }
 
+       mutex_unlock(&priv->mutex);
        IWL_DEBUG_MAC80211(priv, "leave\n");
 
        return ret;