iwlwifi: fix rfkill memory error

Do not free reference to device twice. After rfkill registration succeeds
we only need to call rfkill_unregister() and not rfkill_free().
Also add some debugging.
Signed-off-by: Mohamed Abbas <mabbas@linux.intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -256,9 +256,13 @@ EXPORT_SYMBOL(iwl_setup);
 int iwlcore_low_level_notify(struct iwl_priv *priv,
 			      enum iwlcore_card_notify notify)
 {
+	int ret;
 	switch (notify) {
 	case IWLCORE_INIT_EVT:
-		iwl_rfkill_init(priv);
+		ret = iwl_rfkill_init(priv);
+		if (ret)
+			IWL_ERROR("Unable to initialize RFKILL system. "
+				  "Ignoring error: %d\n", ret);
 		break;
 	case IWLCORE_START_EVT:
 		break;
@@ -266,7 +270,6 @@ int iwlcore_low_level_notify(struct iwl_priv *priv,
 		break;
 	case IWLCORE_REMOVE_EVT:
 		iwl_rfkill_unregister(priv);
-		iwl_rfkill_free(priv);
 		break;
 	}
 

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

@@ -75,8 +75,10 @@ int iwl_rfkill_init(struct iwl_priv *priv)
 
 	BUG_ON(device == NULL);
 
+	IWL_DEBUG_RF_KILL("Initializing RFKILL.\n");
 	priv->rfkill_mngr.rfkill = rfkill_allocate(device, RFKILL_TYPE_WLAN);
 	if (!priv->rfkill_mngr.rfkill) {
+		IWL_ERROR("Unable to allocate rfkill device.\n");
 		ret = -ENOMEM;
 		goto error;
 	}
@@ -92,6 +94,7 @@ int iwl_rfkill_init(struct iwl_priv *priv)
 
 	priv->rfkill_mngr.input_dev = input_allocate_device();
 	if (!priv->rfkill_mngr.input_dev) {
+		IWL_ERROR("Unable to allocate rfkill input device.\n");
 		ret = -ENOMEM;
 		goto freed_rfkill;
 	}
@@ -105,27 +108,35 @@ int iwl_rfkill_init(struct iwl_priv *priv)
 	set_bit(KEY_WLAN, priv->rfkill_mngr.input_dev->keybit);
 
 	ret = rfkill_register(priv->rfkill_mngr.rfkill);
-	if (ret)
+	if (ret) {
+		IWL_ERROR("Unable to register rfkill: %d\n", ret);
 		goto free_input_dev;
+	}
 
 	ret = input_register_device(priv->rfkill_mngr.input_dev);
-	if (ret)
+	if (ret) {
+		IWL_ERROR("Unable to register rfkill input device: %d\n", ret);
 		goto unregister_rfkill;
+	}
 
+	IWL_DEBUG_RF_KILL("RFKILL initialization complete.\n");
 	return ret;
 
 unregister_rfkill:
 	rfkill_unregister(priv->rfkill_mngr.rfkill);
+	priv->rfkill_mngr.rfkill = NULL;
 
 free_input_dev:
 	input_free_device(priv->rfkill_mngr.input_dev);
 	priv->rfkill_mngr.input_dev = NULL;
 
 freed_rfkill:
-	rfkill_free(priv->rfkill_mngr.rfkill);
+	if (priv->rfkill_mngr.rfkill != NULL)
+		rfkill_free(priv->rfkill_mngr.rfkill);
 	priv->rfkill_mngr.rfkill = NULL;
 
 error:
+	IWL_DEBUG_RF_KILL("RFKILL initialization complete.\n");
 	return ret;
 }
 EXPORT_SYMBOL(iwl_rfkill_init);
@@ -138,19 +149,11 @@ void iwl_rfkill_unregister(struct iwl_priv *priv)
 
 	if (priv->rfkill_mngr.rfkill)
 		rfkill_unregister(priv->rfkill_mngr.rfkill);
-}
-EXPORT_SYMBOL(iwl_rfkill_unregister);
 
-
-void iwl_rfkill_free(struct iwl_priv *priv)
-{
-	if (priv->rfkill_mngr.input_dev)
-		input_free_device(priv->rfkill_mngr.input_dev);
-
-	if (priv->rfkill_mngr.rfkill)
-		rfkill_free(priv->rfkill_mngr.rfkill);
+	priv->rfkill_mngr.input_dev = NULL;
+	priv->rfkill_mngr.rfkill = NULL;
 }
-EXPORT_SYMBOL(iwl_rfkill_free);
+EXPORT_SYMBOL(iwl_rfkill_unregister);
 
 /* set rf-kill to the right state. */
 void iwl_rfkill_set_hw_state(struct iwl_priv *priv)

drivers/net/wireless/iwlwifi/iwl-rfkill.h

@@ -41,12 +41,10 @@ struct iwl_rfkill_mngr {
 };
 
 void iwl_rfkill_set_hw_state(struct iwl_priv *priv);
-void iwl_rfkill_free(struct iwl_priv *priv);
 void iwl_rfkill_unregister(struct iwl_priv *priv);
 int iwl_rfkill_init(struct iwl_priv *priv);
 #else
 static inline void iwl_rfkill_set_hw_state(struct iwl_priv *priv) {}
-static inline void iwl_rfkill_free(struct iwl_priv *priv) {}
 static inline void iwl_rfkill_unregister(struct iwl_priv *priv) {}
 static inline int iwl_rfkill_init(struct iwl_priv *priv) { return 0; }
 #endif