[PATCH] ieee80211: Provide generic get_stats implementation

bcm43xx and ipw2100 currently duplicate the same simplistic get_stats
handler.  Additionally, zd1211rw requires the same handler to fix a
bug where all stats are reported as 0.

This patch adds a generic implementation to the ieee80211 layer,
which drivers are free to override.
Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/bcm43xx/bcm43xx_main.c

@@ -4013,11 +4013,6 @@ static int bcm43xx_ieee80211_hard_start_xmit(struct ieee80211_txb *txb,
 	return NETDEV_TX_OK;
 }
 
-static struct net_device_stats * bcm43xx_net_get_stats(struct net_device *net_dev)
-{
-	return &(bcm43xx_priv(net_dev)->ieee->stats);
-}
-
 static void bcm43xx_net_tx_timeout(struct net_device *net_dev)
 {
 	struct bcm43xx_private *bcm = bcm43xx_priv(net_dev);
@@ -4131,7 +4126,6 @@ static int __devinit bcm43xx_init_one(struct pci_dev *pdev,
 
 	net_dev->open = bcm43xx_net_open;
 	net_dev->stop = bcm43xx_net_stop;
-	net_dev->get_stats = bcm43xx_net_get_stats;
 	net_dev->tx_timeout = bcm43xx_net_tx_timeout;
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	net_dev->poll_controller = bcm43xx_net_poll_controller;

drivers/net/wireless/ipw2100.c

@@ -5827,19 +5827,6 @@ static void ipw2100_tx_timeout(struct net_device *dev)
 	schedule_reset(priv);
 }
 
-/*
- * TODO: reimplement it so that it reads statistics
- *       from the adapter using ordinal tables
- *       instead of/in addition to collecting them
- *       in the driver
- */
-static struct net_device_stats *ipw2100_stats(struct net_device *dev)
-{
-	struct ipw2100_priv *priv = ieee80211_priv(dev);
-
-	return &priv->ieee->stats;
-}
-
 static int ipw2100_wpa_enable(struct ipw2100_priv *priv, int value)
 {
 	/* This is called when wpa_supplicant loads and closes the driver
@@ -6022,7 +6009,6 @@ static struct net_device *ipw2100_alloc_device(struct pci_dev *pci_dev,
 	dev->open = ipw2100_open;
 	dev->stop = ipw2100_close;
 	dev->init = ipw2100_net_init;
-	dev->get_stats = ipw2100_stats;
 	dev->ethtool_ops = &ipw2100_ethtool_ops;
 	dev->tx_timeout = ipw2100_tx_timeout;
 	dev->wireless_handlers = &ipw2100_wx_handler_def;

net/ieee80211/ieee80211_module.c

@@ -123,6 +123,13 @@ static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 	return 0;
 }
 
+static struct net_device_stats *ieee80211_generic_get_stats(
+	struct net_device *dev)
+{
+	struct ieee80211_device *ieee = netdev_priv(dev);
+	return &ieee->stats;
+}
+
 struct net_device *alloc_ieee80211(int sizeof_priv)
 {
 	struct ieee80211_device *ieee;
@@ -140,6 +147,10 @@ struct net_device *alloc_ieee80211(int sizeof_priv)
 	dev->hard_start_xmit = ieee80211_xmit;
 	dev->change_mtu = ieee80211_change_mtu;
 
+	/* Drivers are free to override this if the generic implementation
+	 * does not meet their needs. */
+	dev->get_stats = ieee80211_generic_get_stats;
+
 	ieee->dev = dev;
 
 	err = ieee80211_networks_allocate(ieee);