iwlwifi: move rate registration to module load

Having rate registration during module load enables the use of
error checking as well as reliable registration/unregistration
pairing. Previously this was not possible as rate registration
was done during _probe where _probe could be run for more than
one device on the system.
Signed-off-by: Reinette Chatre <reinette.chatre@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-3945-rs.c

@@ -976,12 +976,12 @@ void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
 		       iwl3945_rates[rs_sta->start_rate].plcp);
 }
 
-void iwl3945_rate_control_register(struct ieee80211_hw *hw)
+int iwl3945_rate_control_register(void)
 {
-	ieee80211_rate_control_register(&rs_ops);
+	return ieee80211_rate_control_register(&rs_ops);
 }
 
-void iwl3945_rate_control_unregister(struct ieee80211_hw *hw)
+void iwl3945_rate_control_unregister(void)
 {
 	ieee80211_rate_control_unregister(&rs_ops);
 }

drivers/net/wireless/iwlwifi/iwl-3945-rs.h

@@ -202,7 +202,7 @@ extern void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id);
  * ieee80211_register_hw
  *
  */
-extern void iwl3945_rate_control_register(struct ieee80211_hw *hw);
+extern int iwl3945_rate_control_register(void);
 
 /**
  * iwl3945_rate_control_unregister - Unregister the rate control callbacks
@@ -210,6 +210,6 @@ extern void iwl3945_rate_control_register(struct ieee80211_hw *hw);
  * This should be called after calling ieee80211_unregister_hw, but before
  * the driver is unloaded.
  */
-extern void iwl3945_rate_control_unregister(struct ieee80211_hw *hw);
+extern void iwl3945_rate_control_unregister(void);
 
 #endif

drivers/net/wireless/iwlwifi/iwl-4965-rs.c

@@ -2822,12 +2822,12 @@ void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
 	priv->lq_mngr.lq_ready = 1;
 }
 
-void iwl4965_rate_control_register(struct ieee80211_hw *hw)
+int iwl4965_rate_control_register(void)
 {
-	ieee80211_rate_control_register(&rs_ops);
+	return ieee80211_rate_control_register(&rs_ops);
 }
 
-void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
+void iwl4965_rate_control_unregister(void)
 {
 	ieee80211_rate_control_unregister(&rs_ops);
 }

drivers/net/wireless/iwlwifi/iwl-4965-rs.h

@@ -288,7 +288,7 @@ extern void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id);
  * ieee80211_register_hw
  *
  */
-extern void iwl4965_rate_control_register(struct ieee80211_hw *hw);
+extern int iwl4965_rate_control_register(void);
 
 /**
  * iwl4965_rate_control_unregister - Unregister the rate control callbacks
@@ -296,6 +296,6 @@ extern void iwl4965_rate_control_register(struct ieee80211_hw *hw);
  * This should be called after calling ieee80211_unregister_hw, but before
  * the driver is unloaded.
  */
-extern void iwl4965_rate_control_unregister(struct ieee80211_hw *hw);
+extern void iwl4965_rate_control_unregister(void);
 
 #endif

drivers/net/wireless/iwlwifi/iwl-4965.c

@@ -177,7 +177,6 @@ static int iwl4965_init_drv(struct iwl_priv *priv)
 		goto err_free_channel_map;
 	}
 
-	iwl4965_rate_control_register(priv->hw);
 	ret = ieee80211_register_hw(priv->hw);
 	if (ret) {
 		IWL_ERROR("Failed to register network device (error %d)\n",

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -8156,7 +8156,6 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 		goto out_free_channel_map;
 	}
 
-	iwl3945_rate_control_register(priv->hw);
 	err = ieee80211_register_hw(priv->hw);
 	if (err) {
 		IWL_ERROR("Failed to register network device (error %d)\n", err);
@@ -8241,7 +8240,6 @@ static void __devexit iwl3945_pci_remove(struct pci_dev *pdev)
 
 	if (priv->mac80211_registered) {
 		ieee80211_unregister_hw(priv->hw);
-		iwl3945_rate_control_unregister(priv->hw);
 	}
 
 	/*netif_stop_queue(dev); */
@@ -8322,21 +8320,35 @@ static int __init iwl3945_init(void)
 	int ret;
 	printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");
 	printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");
+
+	ret = iwl3945_rate_control_register();
+	if (ret) {
+		IWL_ERROR("Unable to register rate control algorithm: %d\n", ret);
+		return ret;
+	}
+
 	ret = pci_register_driver(&iwl3945_driver);
 	if (ret) {
 		IWL_ERROR("Unable to initialize PCI module\n");
-		return ret;
+		goto error_register;
 	}
 #ifdef CONFIG_IWL3945_DEBUG
 	ret = driver_create_file(&iwl3945_driver.driver, &driver_attr_debug_level);
 	if (ret) {
 		IWL_ERROR("Unable to create driver sysfs file\n");
-		pci_unregister_driver(&iwl3945_driver);
-		return ret;
+		goto error_debug;
 	}
 #endif
 
 	return ret;
+
+#ifdef CONFIG_IWL3945_DEBUG
+error_debug:
+	pci_unregister_driver(&iwl3945_driver);
+#endif
+error_register:
+	iwl3945_rate_control_unregister();
+	return ret;
 }
 
 static void __exit iwl3945_exit(void)
@@ -8345,6 +8357,7 @@ static void __exit iwl3945_exit(void)
 	driver_remove_file(&iwl3945_driver.driver, &driver_attr_debug_level);
 #endif
 	pci_unregister_driver(&iwl3945_driver);
+	iwl3945_rate_control_unregister();
 }
 
 module_param_named(antenna, iwl3945_param_antenna, int, 0444);

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

@@ -8243,7 +8243,6 @@ static void __devexit iwl4965_pci_remove(struct pci_dev *pdev)
 
 	if (priv->mac80211_registered) {
 		ieee80211_unregister_hw(priv->hw);
-		iwl4965_rate_control_unregister(priv->hw);
 	}
 
 	/*netif_stop_queue(dev); */
@@ -8324,21 +8323,35 @@ static int __init iwl4965_init(void)
 	int ret;
 	printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");
 	printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");
+
+	ret = iwl4965_rate_control_register();
+	if (ret) {
+		IWL_ERROR("Unable to register rate control algorithm: %d\n", ret);
+		return ret;
+	}
+
 	ret = pci_register_driver(&iwl4965_driver);
 	if (ret) {
 		IWL_ERROR("Unable to initialize PCI module\n");
-		return ret;
+		goto error_register;
 	}
 #ifdef CONFIG_IWLWIFI_DEBUG
 	ret = driver_create_file(&iwl4965_driver.driver, &driver_attr_debug_level);
 	if (ret) {
 		IWL_ERROR("Unable to create driver sysfs file\n");
-		pci_unregister_driver(&iwl4965_driver);
-		return ret;
+		goto error_debug;
 	}
 #endif
 
 	return ret;
+
+#ifdef CONFIG_IWLWIFI_DEBUG
+error_debug:
+	pci_unregister_driver(&iwl4965_driver);
+#endif
+error_register:
+	iwl4965_rate_control_unregister();
+	return ret;
 }
 
 static void __exit iwl4965_exit(void)
@@ -8347,6 +8360,7 @@ static void __exit iwl4965_exit(void)
 	driver_remove_file(&iwl4965_driver.driver, &driver_attr_debug_level);
 #endif
 	pci_unregister_driver(&iwl4965_driver);
+	iwl4965_rate_control_unregister();
 }
 
 module_exit(iwl4965_exit);