iwlwifi: allow association on radar channel in power save

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@intel.com>
Signed-off-by: Mohamed Abbas <mohamed.abbas@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 38 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-power.c b/drivers/net/wireless/iwlwifi/iwl-power.c
index eb6312d867d1..16f834d0c486 100644
--- a/drivers/net/wireless/iwlwifi/iwl-power.c
+++ b/drivers/net/wireless/iwlwifi/iwl-power.c
@@ -319,7 +319,7 @@ 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;
@@ -332,6 +332,11 @@ int iwl_power_disable_management(struct iwl_priv *priv)
         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;
 }
@@ -426,3 +431,35 @@ int iwl_power_temperature_change(struct iwl_priv *priv)
         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);