iwlwifi: maintain uCode key table state

This patch fix book keeping of key table in the driver
to be synchronized with uCode

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 34 insertions, 6 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.h b/drivers/net/wireless/iwlwifi/iwl-4965.h
index 23ab5236504..daf157adf24 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.h
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.h
@@ -1116,6 +1116,7 @@ struct iwl_priv {
         struct iwl_wep_key wep_keys[WEP_KEYS_MAX];
         u8 default_wep_key;
         u8 key_mapping_key;
+        unsigned long ucode_key_table;
 
         /* Indication if ieee80211_ops->open has been called */
         u8 is_open;
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index cb964196ad2..41238f208ed 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -36,6 +36,18 @@
 #include "iwl-io.h"
 #include "iwl-helpers.h"
 #include "iwl-4965.h"
+#include "iwl-sta.h"
+
+int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
+{
+        int i;
+
+        for (i = 0; i < STA_KEY_MAX_NUM; i++)
+                if (test_and_set_bit(i, &priv->ucode_key_table))
+                        return i;
+
+        return -1;
+}
 
 int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
 {
@@ -81,14 +93,19 @@ int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
 }
 
 int iwl_remove_default_wep_key(struct iwl_priv *priv,
-                               struct ieee80211_key_conf *key)
+                               struct ieee80211_key_conf *keyconf)
 {
         int ret;
         unsigned long flags;
 
         spin_lock_irqsave(&priv->sta_lock, flags);
+
+        if (!test_and_clear_bit(keyconf->keyidx, &priv->ucode_key_table))
+                IWL_ERROR("index %d not used in uCode key table.\n",
+                          keyconf->keyidx);
+
         priv->default_wep_key--;
-        memset(&priv->wep_keys[key->keyidx], 0, sizeof(priv->wep_keys[0]));
+        memset(&priv->wep_keys[keyconf->keyidx], 0, sizeof(priv->wep_keys[0]));
         ret = iwl_send_static_wepkey_cmd(priv, 1);
         spin_unlock_irqrestore(&priv->sta_lock, flags);
 
@@ -108,6 +125,10 @@ int iwl_set_default_wep_key(struct iwl_priv *priv,
         spin_lock_irqsave(&priv->sta_lock, flags);
         priv->default_wep_key++;
 
+        if (test_and_set_bit(keyconf->keyidx, &priv->ucode_key_table))
+                IWL_ERROR("index %d already used in uCode key table.\n",
+                        keyconf->keyidx);
+
         priv->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
         memcpy(&priv->wep_keys[keyconf->keyidx].key, &keyconf->key,
                                                         keyconf->keylen);
@@ -151,7 +172,8 @@ int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
         memcpy(&priv->stations[sta_id].sta.key.key[3],
                                 keyconf->key, keyconf->keylen);
 
-        priv->stations[sta_id].sta.key.key_offset = sta_id % 8; /* FIXME */
+        priv->stations[sta_id].sta.key.key_offset =
+                                 iwl_get_free_ucode_key_index(priv);
         priv->stations[sta_id].sta.key.key_flags = key_flags;
 
         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.h b/drivers/net/wireless/iwlwifi/iwl-sta.h
index 78e0254c93b..3f1b2053439 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.h
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.h
@@ -37,6 +37,7 @@
 #include "iwl-io.h"
 #include "iwl-helpers.h"
 
+int iwl_get_free_ucode_key_index(struct iwl_priv *priv);
 int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty);
 int iwl_remove_default_wep_key(struct iwl_priv *priv,
                                 struct ieee80211_key_conf *key);
diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c
index 37ab1c565ce..da01896bd40 100644
--- a/drivers/net/wireless/iwlwifi/iwl4965-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c
@@ -1140,8 +1140,8 @@ static int iwl4965_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
                keyconf->keylen);
 
-        priv->stations[sta_id].sta.key.key_offset
-                        = (sta_id % STA_KEY_MAX_NUM);/*FIXME*/
+        priv->stations[sta_id].sta.key.key_offset =
+                                iwl_get_free_ucode_key_index(priv);
         priv->stations[sta_id].sta.key.key_flags = key_flags;
         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
@@ -1187,6 +1187,10 @@ static int iwl4965_clear_sta_key_info(struct iwl_priv *priv, u8 sta_id)
         priv->key_mapping_key = 0;
 
         spin_lock_irqsave(&priv->sta_lock, flags);
+        if (!test_and_clear_bit(priv->stations[sta_id].sta.key.key_offset,
+                &priv->ucode_key_table))
+                IWL_ERROR("index %d not used in uCode key table.\n",
+                        priv->stations[sta_id].sta.key.key_offset);
         memset(&priv->stations[sta_id].keyinfo, 0, sizeof(struct iwl4965_hw_key));
         memset(&priv->stations[sta_id].sta.key, 0, sizeof(struct iwl4965_keyinfo));
         priv->stations[sta_id].sta.key.key_flags = STA_KEY_FLG_NO_ENC;
@@ -6971,7 +6975,7 @@ static void iwl4965_mac_update_tkip_key(struct ieee80211_hw *hw,
         spin_lock_irqsave(&priv->sta_lock, flags);
 
         priv->stations[sta_id].sta.key.key_offset =
-                                        (sta_id % STA_KEY_MAX_NUM);/* FIXME */
+                                iwl_get_free_ucode_key_index(priv);
         priv->stations[sta_id].sta.key.key_flags = key_flags;
         priv->stations[sta_id].sta.key.tkip_rx_tsc_byte2 = (u8) iv32;