[patch 29/49] iwlwifi: allow association on radar channel in powersave

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>

commit c90a74bae10dc2a4677d1bd06b6400db229d3e1e upstream

This patch disables power save upon association and enables it back
after association. This allows to associate to AP on a radar channel
if power save is enabled.

Radar and passive channels are not allowed for TX (required for association)
unless RX is received but PS may close the radio and no RX will be received
effectively failing association.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Mohamed Abbas <mohamed.abbas@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Zhu Yi <yi.zhu@xxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/wireless/iwlwifi/iwl-agn.c   |   24 +++++++++++++++----
 drivers/net/wireless/iwlwifi/iwl-dev.h   |    1 
 drivers/net/wireless/iwlwifi/iwl-power.c |   39 ++++++++++++++++++++++++++++++-
 drivers/net/wireless/iwlwifi/iwl-power.h |    4 ++-
 4 files changed, 61 insertions(+), 7 deletions(-)

--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2486,6 +2486,7 @@ static void iwl4965_post_associate(struc
 	if (!priv->vif || !priv->is_open)
 		return;
 
+	iwl_power_cancel_timeout(priv);
 	iwl_scan_cancel_timeout(priv, 200);
 
 	conf = ieee80211_get_hw_conf(priv->hw);
@@ -2550,10 +2551,6 @@ static void iwl4965_post_associate(struc
 		break;
 	}
 
-	/* Enable Rx differential gain and sensitivity calibrations */
-	iwl_chain_noise_reset(priv);
-	priv->start_calib = 1;
-
 	if (priv->iw_mode == IEEE80211_IF_TYPE_IBSS)
 		priv->assoc_station_added = 1;
 
@@ -2561,7 +2558,12 @@ static void iwl4965_post_associate(struc
 	iwl_activate_qos(priv, 0);
 	spin_unlock_irqrestore(&priv->lock, flags);
 
-	iwl_power_update_mode(priv, 0);
+	iwl_power_enable_management(priv);
+
+	/* Enable Rx differential gain and sensitivity calibrations */
+	iwl_chain_noise_reset(priv);
+	priv->start_calib = 1;
+
 	/* we have just associated, don't start scan too early */
 	priv->next_scan_jiffies = jiffies + IWL_DELAY_NEXT_SCAN;
 }
@@ -3548,6 +3550,16 @@ static void iwl4965_mac_reset_tsf(struct
 	/* Per mac80211.h: This is only used in IBSS mode... */
 	if (priv->iw_mode != IEEE80211_IF_TYPE_IBSS) {
 
+		/* switch to CAM during association period.
+		 * the ucode will block any association/authentication
+		 * frome during assiciation period if it can not hear
+		 * the AP because of PM. the timer enable PM back is
+		 * association do not complete
+		 */
+		if (priv->hw->conf.channel->flags & (IEEE80211_CHAN_PASSIVE_SCAN |
+						     IEEE80211_CHAN_RADAR))
+				iwl_power_disable_management(priv, 3000);
+
 		IWL_DEBUG_MAC80211("leave - not in IBSS\n");
 		mutex_unlock(&priv->mutex);
 		return;
@@ -4085,6 +4097,7 @@ static void iwl_setup_deferred_work(stru
 	/* FIXME : remove when resolved PENDING */
 	INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
 	iwl_setup_scan_deferred_work(priv);
+	iwl_setup_power_deferred_work(priv);
 
 	if (priv->cfg->ops->lib->setup_deferred_work)
 		priv->cfg->ops->lib->setup_deferred_work(priv);
@@ -4104,6 +4117,7 @@ static void iwl_cancel_deferred_work(str
 
 	cancel_delayed_work_sync(&priv->init_alive_start);
 	cancel_delayed_work(&priv->scan_check);
+	cancel_delayed_work_sync(&priv->set_power_save);
 	cancel_delayed_work(&priv->alive_start);
 	cancel_work_sync(&priv->beacon_update);
 	del_timer_sync(&priv->statistics_periodic);
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1047,6 +1047,7 @@ struct iwl_priv {
 
 	struct tasklet_struct irq_tasklet;
 
+	struct delayed_work set_power_save;
 	struct delayed_work init_alive_start;
 	struct delayed_work alive_start;
 	struct delayed_work scan_check;
--- a/drivers/net/wireless/iwlwifi/iwl-power.c
+++ b/drivers/net/wireless/iwlwifi/iwl-power.c
@@ -324,7 +324,7 @@ EXPORT_SYMBOL(iwl_power_update_mode);
  * this will be usefull for rate scale to disable PM during heavy
  * Tx/Rx activities
  */
-int iwl_power_disable_management(struct iwl_priv *priv)
+int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
 {
 	u16 prev_mode;
 	int ret = 0;
@@ -337,6 +337,11 @@ int iwl_power_disable_management(struct 
 	ret = iwl_power_update_mode(priv, 0);
 	priv->power_data.power_disabled = 1;
 	priv->power_data.user_power_setting = prev_mode;
+	cancel_delayed_work(&priv->set_power_save);
+	if (ms)
+		queue_delayed_work(priv->workqueue, &priv->set_power_save,
+				   msecs_to_jiffies(ms));
+
 
 	return ret;
 }
@@ -431,3 +436,35 @@ int iwl_power_temperature_change(struct 
 	return ret;
 }
 EXPORT_SYMBOL(iwl_power_temperature_change);
+
+static void iwl_bg_set_power_save(struct work_struct *work)
+{
+	struct iwl_priv *priv = container_of(work,
+				struct iwl_priv, set_power_save.work);
+	IWL_DEBUG(IWL_DL_STATE, "update power\n");
+
+	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
+		return;
+
+	mutex_lock(&priv->mutex);
+
+	/* on starting association we disable power managment
+	 * until association, if association failed then this
+	 * timer will expire and enable PM again.
+	 */
+	if (!iwl_is_associated(priv))
+		iwl_power_enable_management(priv);
+
+	mutex_unlock(&priv->mutex);
+}
+void iwl_setup_power_deferred_work(struct iwl_priv *priv)
+{
+	INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
+}
+EXPORT_SYMBOL(iwl_setup_power_deferred_work);
+
+void iwl_power_cancel_timeout(struct iwl_priv *priv)
+{
+	cancel_delayed_work(&priv->set_power_save);
+}
+EXPORT_SYMBOL(iwl_power_cancel_timeout);
--- a/drivers/net/wireless/iwlwifi/iwl-power.h
+++ b/drivers/net/wireless/iwlwifi/iwl-power.h
@@ -78,8 +78,10 @@ struct iwl_power_mgr {
 	u8 power_disabled; /* flag to disable using power saving level */
 };
 
+void iwl_setup_power_deferred_work(struct iwl_priv *priv);
+void iwl_power_cancel_timeout(struct iwl_priv *priv);
 int iwl_power_update_mode(struct iwl_priv *priv, u8 refresh);
-int iwl_power_disable_management(struct iwl_priv *priv);
+int iwl_power_disable_management(struct iwl_priv *priv, u32 ms);
 int iwl_power_enable_management(struct iwl_priv *priv);
 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode);
 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode);

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