iwlwifi: cache mac80211 conf setting during a hardware scan

This patch caches mac80211 configuration setting during a hardware
scan for the iwlwifi drivers.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 74 insertions, 28 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.h b/drivers/net/wireless/iwlwifi/iwl-3945.h
index 462936a74c19..263b0b71c0c3 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.h
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.h
@@ -714,6 +714,7 @@ struct iwl3945_priv {
         struct ieee80211_hw *hw;
         struct ieee80211_channel *ieee_channels;
         struct ieee80211_rate *ieee_rates;
+        struct ieee80211_conf *cache_conf;
 
         /* temporary frame storage list */
         struct list_head free_frames;
diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.h b/drivers/net/wireless/iwlwifi/iwl-4965.h
index 42ce27f2eee4..dda2bfbcb059 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.h
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.h
@@ -1044,6 +1044,7 @@ struct iwl4965_priv {
         struct ieee80211_hw *hw;
         struct ieee80211_channel *ieee_channels;
         struct ieee80211_rate *ieee_rates;
+        struct ieee80211_conf *cache_conf;
 
         /* temporary frame storage list */
         struct list_head free_frames;
diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index ae352daeb3fb..bab42a1351ca 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -6965,6 +6965,8 @@ static void iwl3945_bg_abort_scan(struct work_struct *work)
         mutex_unlock(&priv->mutex);
 }
 
+static int iwl3945_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf);
+
 static void iwl3945_bg_scan_completed(struct work_struct *work)
 {
         struct iwl3945_priv *priv =
@@ -6975,6 +6977,9 @@ static void iwl3945_bg_scan_completed(struct work_struct *work)
         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                 return;
 
+        if (priv->cache_conf)
+                iwl3945_mac_config(priv->hw, priv->cache_conf);
+
         ieee80211_scan_completed(priv->hw);
 
         /* Since setting the TXPOWER may have been deferred while
@@ -7104,23 +7109,38 @@ static int iwl3945_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
         struct iwl3945_priv *priv = hw->priv;
         const struct iwl3945_channel_info *ch_info;
         unsigned long flags;
+        int ret = 0;
 
         mutex_lock(&priv->mutex);
         IWL_DEBUG_MAC80211("enter to channel %d\n", conf->channel);
 
         if (!iwl3945_is_ready(priv)) {
                 IWL_DEBUG_MAC80211("leave - not ready\n");
-                mutex_unlock(&priv->mutex);
-                return -EIO;
+                ret = -EIO;
+                goto out;
         }
 
         /* TODO: Figure out how to get ieee80211_local->sta_scanning w/ only
          * what is exposed through include/ declarations */
         if (unlikely(!iwl3945_param_disable_hw_scan &&
                      test_bit(STATUS_SCANNING, &priv->status))) {
-                IWL_DEBUG_MAC80211("leave - scanning\n");
+
+                if (priv->cache_conf)
+                        IWL_DEBUG_MAC80211("leave - still scanning\n");
+                else {
+                        /* Cache the configuration now so that we can
+                         * replay it after the hardware scan is finished. */
+                        priv->cache_conf = kmalloc(sizeof(*conf), GFP_KERNEL);
+                        if (priv->cache_conf) {
+                                memcpy(priv->cache_conf, conf, sizeof(*conf));
+                                IWL_DEBUG_MAC80211("leave - scanning\n");
+                        } else {
+                                IWL_DEBUG_MAC80211("leave - no memory\n");
+                                ret = -ENOMEM;
+                        }
+                }
                 mutex_unlock(&priv->mutex);
-                return 0;
+                return ret;
         }
 
         spin_lock_irqsave(&priv->lock, flags);
@@ -7131,8 +7151,8 @@ static int iwl3945_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
                                conf->channel, conf->phymode);
                 IWL_DEBUG_MAC80211("leave - invalid channel\n");
                 spin_unlock_irqrestore(&priv->lock, flags);
-                mutex_unlock(&priv->mutex);
-                return -EINVAL;
+                ret = -EINVAL;
+                goto out;
         }
 
         iwl3945_set_rxon_channel(priv, conf->phymode, conf->channel);
@@ -7149,8 +7169,7 @@ static int iwl3945_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
 #ifdef IEEE80211_CONF_CHANNEL_SWITCH
         if (conf->flags & IEEE80211_CONF_CHANNEL_SWITCH) {
                 iwl3945_hw_channel_switch(priv, conf->channel);
-                mutex_unlock(&priv->mutex);
-                return 0;
+                goto out;
         }
 #endif
 
@@ -7158,14 +7177,13 @@ static int iwl3945_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
 
         if (!conf->radio_enabled) {
                 IWL_DEBUG_MAC80211("leave - radio disabled\n");
-                mutex_unlock(&priv->mutex);
-                return 0;
+                goto out;
         }
 
         if (iwl3945_is_rfkill(priv)) {
                 IWL_DEBUG_MAC80211("leave - RF kill\n");
-                mutex_unlock(&priv->mutex);
-                return -EIO;
+                ret = -EIO;
+                goto out;
         }
 
         iwl3945_set_rate(priv);
@@ -7178,9 +7196,13 @@ static int iwl3945_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
 
         IWL_DEBUG_MAC80211("leave\n");
 
+out:
+        if (priv->cache_conf) {
+                kfree(priv->cache_conf);
+                priv->cache_conf = NULL;
+        }
         mutex_unlock(&priv->mutex);
-
-        return 0;
+        return ret;
 }
 
 static void iwl3945_config_ap(struct iwl3945_priv *priv)
diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c
index 6a8c629ce0bb..8bc2634bb407 100644
--- a/drivers/net/wireless/iwlwifi/iwl4965-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c
@@ -7403,6 +7403,8 @@ static void iwl4965_bg_abort_scan(struct work_struct *work)
         mutex_unlock(&priv->mutex);
 }
 
+static int iwl4965_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf);
+
 static void iwl4965_bg_scan_completed(struct work_struct *work)
 {
         struct iwl4965_priv *priv =
@@ -7413,6 +7415,9 @@ static void iwl4965_bg_scan_completed(struct work_struct *work)
         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                 return;
 
+        if (priv->cache_conf)
+                iwl4965_mac_config(priv->hw, priv->cache_conf);
+
         ieee80211_scan_completed(priv->hw);
 
         /* Since setting the TXPOWER may have been deferred while
@@ -7541,23 +7546,38 @@ static int iwl4965_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
         struct iwl4965_priv *priv = hw->priv;
         const struct iwl4965_channel_info *ch_info;
         unsigned long flags;
+        int ret = 0;
 
         mutex_lock(&priv->mutex);
         IWL_DEBUG_MAC80211("enter to channel %d\n", conf->channel);
 
         if (!iwl4965_is_ready(priv)) {
                 IWL_DEBUG_MAC80211("leave - not ready\n");
-                mutex_unlock(&priv->mutex);
-                return -EIO;
+                ret = -EIO;
+                goto out;
         }
 
         /* TODO: Figure out how to get ieee80211_local->sta_scanning w/ only
          * what is exposed through include/ declarations */
         if (unlikely(!iwl4965_param_disable_hw_scan &&
                      test_bit(STATUS_SCANNING, &priv->status))) {
-                IWL_DEBUG_MAC80211("leave - scanning\n");
+
+                if (unlikely(priv->cache_conf))
+                        IWL_DEBUG_MAC80211("leave - still scanning\n");
+                else {
+                        /* Cache the configuration now so that we can
+                         * replay it after the hardware scan is finished. */
+                        priv->cache_conf = kmalloc(sizeof(*conf), GFP_KERNEL);
+                        if (priv->cache_conf) {
+                                memcpy(priv->cache_conf, conf, sizeof(*conf));
+                                IWL_DEBUG_MAC80211("leave - scanning\n");
+                        } else {
+                                IWL_DEBUG_MAC80211("leave - no memory\n");
+                                ret = -ENOMEM;
+                        }
+                }
                 mutex_unlock(&priv->mutex);
-                return 0;
+                return ret;
         }
 
         spin_lock_irqsave(&priv->lock, flags);
@@ -7568,8 +7588,8 @@ static int iwl4965_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
                                conf->channel, conf->phymode);
                 IWL_DEBUG_MAC80211("leave - invalid channel\n");
                 spin_unlock_irqrestore(&priv->lock, flags);
-                mutex_unlock(&priv->mutex);
-                return -EINVAL;
+                ret = -EINVAL;
+                goto out;
         }
 
 #ifdef CONFIG_IWL4965_HT
@@ -7598,8 +7618,7 @@ static int iwl4965_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
 #ifdef IEEE80211_CONF_CHANNEL_SWITCH
         if (conf->flags & IEEE80211_CONF_CHANNEL_SWITCH) {
                 iwl4965_hw_channel_switch(priv, conf->channel);
-                mutex_unlock(&priv->mutex);
-                return 0;
+                goto out;
         }
 #endif
 
@@ -7607,14 +7626,13 @@ static int iwl4965_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
 
         if (!conf->radio_enabled) {
                 IWL_DEBUG_MAC80211("leave - radio disabled\n");
-                mutex_unlock(&priv->mutex);
-                return 0;
+                goto out;
         }
 
         if (iwl4965_is_rfkill(priv)) {
                 IWL_DEBUG_MAC80211("leave - RF kill\n");
-                mutex_unlock(&priv->mutex);
-                return -EIO;
+                ret = -EIO;
+                goto out;
         }
 
         iwl4965_set_rate(priv);
@@ -7627,9 +7645,13 @@ static int iwl4965_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *co
 
         IWL_DEBUG_MAC80211("leave\n");
 
+out:
+        if (priv->cache_conf) {
+                kfree(priv->cache_conf);
+                priv->cache_conf = NULL;
+        }
         mutex_unlock(&priv->mutex);
-
-        return 0;
+        return ret;
 }
 
 static void iwl4965_config_ap(struct iwl4965_priv *priv)