[bug 667] Fix the notorious "No space for Tx" bug.

We send SYSTEM_CONFIG command after the TGI_KEY command if hardware
encryption is enabled. It sometimes causes a firmware stall (firmware
doesn't respond to any request) and finally bungs up the Tx send queue.
The solution is to send SYSTEM_CONFIG command in the post association
stage from a workqueue.

Signed-off-by: James Ketrenos <jketreno@linux.intel.com>

diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c
index 93ed871..f3048f8 100644 (file)
--- a/drivers/net/wireless/ipw2200.c
+++ b/drivers/net/wireless/ipw2200.c
@@ -3589,6 +3589,12 @@ static void ipw_bg_disassociate(void *data)
        up(&priv->sem);
 }
 
+static void ipw_system_config(void *data)
+{
+       struct ipw_priv *priv = data;
+       ipw_send_system_config(priv, &priv->sys_config);
+}
+
 struct ipw_status_code {
        u16 status;
        const char *reason;
@@ -4060,6 +4066,8 @@ static inline void ipw_rx_notification(struct ipw_priv *priv,
 
                                        priv->status &= ~STATUS_ASSOCIATING;
                                        priv->status |= STATUS_ASSOCIATED;
+                                       queue_work(priv->workqueue,
+                                                  &priv->system_config);
 
 #ifdef CONFIG_IPW_QOS
 #define IPW_GET_PACKET_STYPE(x) WLAN_FC_GET_STYPE( \
@@ -5553,45 +5561,36 @@ static void ipw_set_hwcrypto_keys(struct ipw_priv *priv)
 {
        switch (priv->ieee->sec.level) {
        case SEC_LEVEL_3:
-               if (!(priv->ieee->sec.flags & SEC_ACTIVE_KEY))
-                       break;
+               if (priv->ieee->sec.flags & SEC_ACTIVE_KEY)
+                       ipw_send_tgi_tx_key(priv,
+                                           DCT_FLAG_EXT_SECURITY_CCM,
+                                           priv->ieee->sec.active_key);
 
-               ipw_send_tgi_tx_key(priv, DCT_FLAG_EXT_SECURITY_CCM,
-                                   priv->ieee->sec.active_key);
                ipw_send_wep_keys(priv, DCW_WEP_KEY_SEC_TYPE_CCM);
-
                priv->sys_config.disable_unicast_decryption = 0;
                priv->sys_config.disable_multicast_decryption = 0;
                priv->ieee->host_decrypt = 0;
-               if (ipw_send_system_config(priv, &priv->sys_config))
-                       IPW_ERROR("ipw_send_system_config failed\n");
-
                break;
        case SEC_LEVEL_2:
-               if (!(priv->ieee->sec.flags & SEC_ACTIVE_KEY))
-                       break;
-
-               ipw_send_tgi_tx_key(priv, DCT_FLAG_EXT_SECURITY_TKIP,
-                                   priv->ieee->sec.active_key);
+               if (priv->ieee->sec.flags & SEC_ACTIVE_KEY)
+                       ipw_send_tgi_tx_key(priv,
+                                           DCT_FLAG_EXT_SECURITY_TKIP,
+                                           priv->ieee->sec.active_key);
 
                priv->sys_config.disable_unicast_decryption = 1;
                priv->sys_config.disable_multicast_decryption = 1;
                priv->ieee->host_decrypt = 1;
-               if (ipw_send_system_config(priv, &priv->sys_config))
-                       IPW_ERROR("ipw_send_system_config failed\n");
-
                break;
        case SEC_LEVEL_1:
                ipw_send_wep_keys(priv, DCW_WEP_KEY_SEC_TYPE_WEP);
-
                priv->sys_config.disable_unicast_decryption = 0;
                priv->sys_config.disable_multicast_decryption = 0;
                priv->ieee->host_decrypt = 0;
-               if (ipw_send_system_config(priv, &priv->sys_config))
-                       IPW_ERROR("ipw_send_system_config failed\n");
-
                break;
        case SEC_LEVEL_0:
+               priv->sys_config.disable_unicast_decryption = 1;
+               priv->sys_config.disable_multicast_decryption = 1;
+               break;
        default:
                break;
        }
@@ -10113,6 +10112,7 @@ static int ipw_setup_deferred_work(struct ipw_priv *priv)
        INIT_WORK(&priv->adhoc_check, ipw_bg_adhoc_check, priv);
        INIT_WORK(&priv->associate, ipw_bg_associate, priv);
        INIT_WORK(&priv->disassociate, ipw_bg_disassociate, priv);
+       INIT_WORK(&priv->system_config, ipw_system_config, priv);
        INIT_WORK(&priv->rx_replenish, ipw_bg_rx_queue_replenish, priv);
        INIT_WORK(&priv->adapter_restart, ipw_bg_adapter_restart, priv);
        INIT_WORK(&priv->rf_kill, ipw_bg_rf_kill, priv);
@@ -10206,10 +10206,10 @@ static void shim__set_security(struct net_device *dev,
                priv->ieee->sec.level = sec->level;
                priv->ieee->sec.flags |= SEC_LEVEL;
                priv->status |= STATUS_SECURITY_UPDATED;
-       }
 
-       if (!priv->ieee->host_encrypt)
-               ipw_set_hwcrypto_keys(priv);
+               if (!priv->ieee->host_encrypt && (sec->flags & SEC_ENCRYPT))
+                       ipw_set_hwcrypto_keys(priv);
+       }
 
        /* To match current functionality of ipw2100 (which works well w/
         * various supplicants, we don't force a disassociate if the

diff --git a/drivers/net/wireless/ipw2200.h b/drivers/net/wireless/ipw2200.h
index 915f469..28667d3 100644 (file)
--- a/drivers/net/wireless/ipw2200.h
+++ b/drivers/net/wireless/ipw2200.h
@@ -1205,6 +1205,7 @@ struct ipw_priv {
        struct work_struct adhoc_check;
        struct work_struct associate;
        struct work_struct disassociate;
+       struct work_struct system_config;
        struct work_struct rx_replenish;
        struct work_struct request_scan;
        struct work_struct adapter_restart;