iwlwifi: clean up HW RF-kill state machine and restarts

This patch cleans up HW RF-kill state machine.

Signed-off-by: Mohamed Abbas <mohamed.abbas@intel.com>
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>

drivers/net/wireless/iwlwifi/iwl-core.c

@@ -1407,7 +1407,14 @@ int iwl_radio_kill_sw_enable_radio(struct iwl_priv *priv)
 	spin_lock_irqsave(&priv->lock, flags);
 	iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
 
-	clear_bit(STATUS_RF_KILL_SW, &priv->status);
+	/* If the driver is up it will receive CARD_STATE_NOTIFICATION
+	 * notification where it will clear SW rfkill status.
+	 * Setting it here would break the handler. Only if the
+	 * interface is down we can set here since we don't
+	 * receive any further notification.
+	 */
+	if (!priv->is_open)
+		clear_bit(STATUS_RF_KILL_SW, &priv->status);
 	spin_unlock_irqrestore(&priv->lock, flags);
 
 	/* wake up ucode */
@@ -1425,8 +1432,10 @@ int iwl_radio_kill_sw_enable_radio(struct iwl_priv *priv)
 		return 0;
 	}
 
-	if (priv->is_open)
-		queue_work(priv->workqueue, &priv->restart);
+	/* If the driver is already loaded, it will receive
+	 * CARD_STATE_NOTIFICATION notifications and the handler will
+	 * call restart to reload the driver.
+	 */
 	return 1;
 }
 EXPORT_SYMBOL(iwl_radio_kill_sw_enable_radio);

drivers/net/wireless/iwlwifi/iwl4965-base.c

@@ -1606,14 +1606,12 @@ static void iwl4965_irq_tasklet(struct iwl_priv *priv)
 		IWL_DEBUG(IWL_DL_RF_KILL, "RF_KILL bit toggled to %s.\n",
 				hw_rf_kill ? "disable radio":"enable radio");
 
-		/* Queue restart only if RF_KILL switch was set to "kill"
-		 *   when we loaded driver, and is now set to "enable".
-		 * After we're Alive, RF_KILL gets handled by
-		 *   iwl4965_rx_card_state_notif() */
-		if (!hw_rf_kill && !test_bit(STATUS_ALIVE, &priv->status)) {
+		/* driver only loads ucode once setting the interface up.
+		 * the driver as well won't allow loading if RFKILL is set
+		 * therefore no need to restart the driver from this handler
+		 */
+		if (!hw_rf_kill && !test_bit(STATUS_ALIVE, &priv->status))
 			clear_bit(STATUS_RF_KILL_HW, &priv->status);
-			queue_work(priv->workqueue, &priv->restart);
-		}
 
 		handled |= CSR_INT_BIT_RF_KILL;
 	}