mac80211: introduce hw config change flags

This makes mac80211 notify the driver which configuration
actually changed, e.g. channel etc.

No driver changes, this is just plumbing, driver authors are
expected to act on this if they want to.

Also remove the HW CONFIG debug printk, it's incorrect, often
we configure something else.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

24 files changed, 116 insertions, 60 deletions

diff --git a/drivers/net/wireless/adm8211.c b/drivers/net/wireless/adm8211.c
index 6e18c9d3678..9a1e0c514c0 100644
--- a/drivers/net/wireless/adm8211.c
+++ b/drivers/net/wireless/adm8211.c
@@ -1314,9 +1314,10 @@ static int adm8211_set_ssid(struct ieee80211_hw *dev, u8 *ssid, size_t ssid_len)
 	return 0;
 }
 
-static int adm8211_config(struct ieee80211_hw *dev, struct ieee80211_conf *conf)
+static int adm8211_config(struct ieee80211_hw *dev, u32 changed)
 {
 	struct adm8211_priv *priv = dev->priv;
+	struct ieee80211_conf *conf = &dev->conf;
 	int channel = ieee80211_frequency_to_channel(conf->channel->center_freq);
 
 	if (channel != priv->channel) {
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index 9e47d727e22..fcd688765d0 100644
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -219,8 +219,7 @@ static int ath5k_add_interface(struct ieee80211_hw *hw,
 		struct ieee80211_if_init_conf *conf);
 static void ath5k_remove_interface(struct ieee80211_hw *hw,
 		struct ieee80211_if_init_conf *conf);
-static int ath5k_config(struct ieee80211_hw *hw,
-		struct ieee80211_conf *conf);
+static int ath5k_config(struct ieee80211_hw *hw, u32 changed);
 static int ath5k_config_interface(struct ieee80211_hw *hw,
 		struct ieee80211_vif *vif,
 		struct ieee80211_if_conf *conf);
@@ -2780,10 +2779,10 @@ end:
  * TODO: Phy disable/diversity etc
  */
 static int
-ath5k_config(struct ieee80211_hw *hw,
-			struct ieee80211_conf *conf)
+ath5k_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct ath5k_softc *sc = hw->priv;
+	struct ieee80211_conf *conf = &hw->conf;
 
 	sc->bintval = conf->beacon_int;
 	sc->power_level = conf->power_level;
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 5e087c92a6d..f49910799ed 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -1230,11 +1230,11 @@ static void ath9k_remove_interface(struct ieee80211_hw *hw,
 			__func__, error);
 }
 
-static int ath9k_config(struct ieee80211_hw *hw,
-			struct ieee80211_conf *conf)
+static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct ath_softc *sc = hw->priv;
 	struct ieee80211_channel *curchan = hw->conf.channel;
+	struct ieee80211_conf *conf = &hw->conf;
 	int pos;
 
 	DPRINTF(sc, ATH_DBG_CONFIG, "%s: Set channel: %d MHz\n",
diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 6b85428b0e1..2e81af1022e 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -3320,11 +3320,12 @@ init_failure:
 	return err;
 }
 
-static int b43_op_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+static int b43_op_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct b43_wl *wl = hw_to_b43_wl(hw);
 	struct b43_wldev *dev;
 	struct b43_phy *phy;
+	struct ieee80211_conf *conf = &hw->conf;
 	unsigned long flags;
 	int antenna;
 	int err = 0;
diff --git a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c
index 867f01ce45c..793cc396562 100644
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -2557,11 +2557,12 @@ init_failure:
 }
 
 static int b43legacy_op_dev_config(struct ieee80211_hw *hw,
-				   struct ieee80211_conf *conf)
+				   u32 changed)
 {
 	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
 	struct b43legacy_wldev *dev;
 	struct b43legacy_phy *phy;
+	struct ieee80211_conf *conf = &hw->conf;
 	unsigned long flags;
 	unsigned int new_phymode = 0xFFFF;
 	int antenna_tx;
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index e6695e80fb5..79a24410dd0 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2734,10 +2734,11 @@ static int iwl4965_mac_add_interface(struct ieee80211_hw *hw,
  * be set inappropriately and the driver currently sets the hardware up to
  * use it whenever needed.
  */
-static int iwl4965_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+static int iwl4965_mac_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct iwl_priv *priv = hw->priv;
 	const struct iwl_channel_info *ch_info;
+	struct ieee80211_conf *conf = &hw->conf;
 	unsigned long flags;
 	int ret = 0;
 	u16 channel;
diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index d3a2966d918..b1464c71ea0 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -6415,7 +6415,7 @@ static void iwl3945_bg_abort_scan(struct work_struct *work)
 	mutex_unlock(&priv->mutex);
 }
 
-static int iwl3945_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf);
+static int iwl3945_mac_config(struct ieee80211_hw *hw, u32 changed);
 
 static void iwl3945_bg_scan_completed(struct work_struct *work)
 {
@@ -6428,7 +6428,7 @@ static void iwl3945_bg_scan_completed(struct work_struct *work)
 		return;
 
 	if (test_bit(STATUS_CONF_PENDING, &priv->status))
-		iwl3945_mac_config(priv->hw, ieee80211_get_hw_conf(priv->hw));
+		iwl3945_mac_config(priv->hw, 0);
 
 	ieee80211_scan_completed(priv->hw);
 
@@ -6616,10 +6616,11 @@ static int iwl3945_mac_add_interface(struct ieee80211_hw *hw,
  * be set inappropriately and the driver currently sets the hardware up to
  * use it whenever needed.
  */
-static int iwl3945_mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+static int iwl3945_mac_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct iwl3945_priv *priv = hw->priv;
 	const struct iwl3945_channel_info *ch_info;
+	struct ieee80211_conf *conf = &hw->conf;
 	unsigned long flags;
 	int ret = 0;
 
diff --git a/drivers/net/wireless/libertas_tf/main.c b/drivers/net/wireless/libertas_tf/main.c
index feff945ad85..241ddcfa352 100644
--- a/drivers/net/wireless/libertas_tf/main.c
+++ b/drivers/net/wireless/libertas_tf/main.c
@@ -354,9 +354,11 @@ static void lbtf_op_remove_interface(struct ieee80211_hw *hw,
 	priv->vif = NULL;
 }
 
-static int lbtf_op_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+static int lbtf_op_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct lbtf_private *priv = hw->priv;
+	struct ieee80211_conf *conf = &hw->conf;
+
 	if (conf->channel->center_freq != priv->cur_freq) {
 		priv->cur_freq = conf->channel->center_freq;
 		lbtf_set_channel(priv, conf->channel->hw_value);
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 3f236b54668..e2aeef8de70 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -359,10 +359,10 @@ static void mac80211_hwsim_beacon(unsigned long arg)
 }
 
 
-static int mac80211_hwsim_config(struct ieee80211_hw *hw,
-				 struct ieee80211_conf *conf)
+static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct mac80211_hwsim_data *data = hw->priv;
+	struct ieee80211_conf *conf = &hw->conf;
 
 	printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
 	       wiphy_name(hw->wiphy), __func__,
diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index b3e75eb4d5b..b3c297ed00c 100644
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -1192,10 +1192,11 @@ static void p54_remove_interface(struct ieee80211_hw *dev,
 	p54_set_filter(dev, 0, NULL);
 }
 
-static int p54_config(struct ieee80211_hw *dev, struct ieee80211_conf *conf)
+static int p54_config(struct ieee80211_hw *dev, u32 changed)
 {
 	int ret;
 	struct p54_common *priv = dev->priv;
+	struct ieee80211_conf *conf = &dev->conf;
 
 	mutex_lock(&priv->conf_mutex);
 	priv->rx_antenna = 2; /* automatic */
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 1359a376840..8ec8f7e9ec6 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -997,7 +997,7 @@ int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 			    struct ieee80211_if_init_conf *conf);
 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 				struct ieee80211_if_init_conf *conf);
-int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf);
+int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed);
 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
 			       struct ieee80211_vif *vif,
 			       struct ieee80211_if_conf *conf);
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 9e0472bd1ed..697806cf94e 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -1245,7 +1245,7 @@ int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
 	/*
 	 * Reconfigure device.
 	 */
-	retval = rt2x00mac_config(rt2x00dev->hw, &rt2x00dev->hw->conf);
+	retval = rt2x00mac_config(rt2x00dev->hw, ~0);
 	if (retval)
 		goto exit;
 
diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
index 2c6cc5c374f..da7b49a364f 100644
--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -335,9 +335,10 @@ void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 
-int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct ieee80211_conf *conf = &hw->conf;
 	int radio_on;
 	int status;
 
diff --git a/drivers/net/wireless/rtl8180_dev.c b/drivers/net/wireless/rtl8180_dev.c
index 9de8f57486d..e8d22393797 100644
--- a/drivers/net/wireless/rtl8180_dev.c
+++ b/drivers/net/wireless/rtl8180_dev.c
@@ -692,9 +692,10 @@ static void rtl8180_remove_interface(struct ieee80211_hw *dev,
 	priv->vif = NULL;
 }
 
-static int rtl8180_config(struct ieee80211_hw *dev, struct ieee80211_conf *conf)
+static int rtl8180_config(struct ieee80211_hw *dev, u32 changed)
 {
 	struct rtl8180_priv *priv = dev->priv;
+	struct ieee80211_conf *conf = &dev->conf;
 
 	priv->rf->set_chan(dev, conf);
 
diff --git a/drivers/net/wireless/rtl8187_dev.c b/drivers/net/wireless/rtl8187_dev.c
index 9ceae9017f8..2c69ab37c65 100644
--- a/drivers/net/wireless/rtl8187_dev.c
+++ b/drivers/net/wireless/rtl8187_dev.c
@@ -873,9 +873,10 @@ static void rtl8187_remove_interface(struct ieee80211_hw *dev,
 	mutex_unlock(&priv->conf_mutex);
 }
 
-static int rtl8187_config(struct ieee80211_hw *dev, struct ieee80211_conf *conf)
+static int rtl8187_config(struct ieee80211_hw *dev, u32 changed)
 {
 	struct rtl8187_priv *priv = dev->priv;
+	struct ieee80211_conf *conf = &dev->conf;
 	u32 reg;
 
 	mutex_lock(&priv->conf_mutex);
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index de45509d757..6c3e21887fc 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -743,9 +743,11 @@ static void zd_op_remove_interface(struct ieee80211_hw *hw,
 	zd_write_mac_addr(&mac->chip, NULL);
 }
 
-static int zd_op_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+static int zd_op_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct zd_mac *mac = zd_hw_mac(hw);
+	struct ieee80211_conf *conf = &hw->conf;
+
 	return zd_chip_set_channel(&mac->chip, conf->channel->hw_value);
 }
 
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 5f28b7f8988..34e8569b59b 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -464,12 +464,32 @@ static inline int __deprecated __IEEE80211_CONF_SHORT_SLOT_TIME(void)
 #define IEEE80211_CONF_SHORT_SLOT_TIME (__IEEE80211_CONF_SHORT_SLOT_TIME())
 
 /**
+ * enum ieee80211_conf_changed - denotes which configuration changed
+ *
+ * @IEEE80211_CONF_CHANGE_RADIO_ENABLED: the value of radio_enabled changed
+ * @IEEE80211_CONF_CHANGE_BEACON_INTERVAL: the beacon interval changed
+ * @IEEE80211_CONF_CHANGE_LISTEN_INTERVAL: the listen interval changed
+ * @IEEE80211_CONF_CHANGE_RADIOTAP: the radiotap flag changed
+ * @IEEE80211_CONF_CHANGE_PS: the PS flag changed
+ * @IEEE80211_CONF_CHANGE_POWER: the TX power changed
+ * @IEEE80211_CONF_CHANGE_CHANNEL: the channel changed
+ */
+enum ieee80211_conf_changed {
+	IEEE80211_CONF_CHANGE_RADIO_ENABLED	= BIT(0),
+	IEEE80211_CONF_CHANGE_BEACON_INTERVAL	= BIT(1),
+	IEEE80211_CONF_CHANGE_LISTEN_INTERVAL	= BIT(2),
+	IEEE80211_CONF_CHANGE_RADIOTAP		= BIT(3),
+	IEEE80211_CONF_CHANGE_PS		= BIT(4),
+	IEEE80211_CONF_CHANGE_POWER		= BIT(5),
+	IEEE80211_CONF_CHANGE_CHANNEL		= BIT(6),
+};
+
+/**
  * struct ieee80211_conf - configuration of the device
  *
  * This struct indicates how the driver shall configure the hardware.
  *
  * @radio_enabled: when zero, driver is required to switch off the radio.
- *	TODO make a flag
  * @beacon_int: beacon interval (TODO make interface config)
  * @listen_interval: listen interval in units of beacon interval
  * @flags: configuration flags defined above
@@ -479,13 +499,13 @@ static inline int __deprecated __IEEE80211_CONF_SHORT_SLOT_TIME(void)
  * @channel: the channel to tune to
  */
 struct ieee80211_conf {
-	int radio_enabled;
-
 	int beacon_int;
-	u16 listen_interval;
 	u32 flags;
 	int power_level;
 
+	u16 listen_interval;
+	bool radio_enabled;
+
 	struct ieee80211_channel *channel;
 
 	struct ieee80211_sta_ht_cap ht_cap;
@@ -1214,7 +1234,7 @@ struct ieee80211_ops {
 			     struct ieee80211_if_init_conf *conf);
 	void (*remove_interface)(struct ieee80211_hw *hw,
 				 struct ieee80211_if_init_conf *conf);
-	int (*config)(struct ieee80211_hw *hw, struct ieee80211_conf *conf);
+	int (*config)(struct ieee80211_hw *hw, u32 changed);
 	int (*config_interface)(struct ieee80211_hw *hw,
 				struct ieee80211_vif *vif,
 				struct ieee80211_if_conf *conf);
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index a5dea617aab..8ea30902d5d 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -394,7 +394,8 @@ static int ieee80211_config_beacon(struct ieee80211_sub_if_data *sdata,
 	 */
 	if (params->interval) {
 		sdata->local->hw.conf.beacon_int = params->interval;
-		ieee80211_hw_config(sdata->local);
+		ieee80211_hw_config(sdata->local,
+				    IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
 		/*
 		 * We updated some parameter so if below bails out
 		 * it's not an error.
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 88015838a63..1deb787ff8d 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -875,7 +875,7 @@ static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
 }
 
 
-int ieee80211_hw_config(struct ieee80211_local *local);
+int ieee80211_hw_config(struct ieee80211_local *local, u32 changed);
 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed);
 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx);
 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 8336fee68d3..df28c5f7c9c 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -65,7 +65,7 @@ static int ieee80211_open(struct net_device *dev)
 	struct ieee80211_if_init_conf conf;
 	u32 changed = 0;
 	int res;
-	bool need_hw_reconfig = 0;
+	u32 hw_reconf_flags = 0;
 	u8 null_addr[ETH_ALEN] = {0};
 
 	/* fail early if user set an invalid address */
@@ -152,7 +152,8 @@ static int ieee80211_open(struct net_device *dev)
 			res = local->ops->start(local_to_hw(local));
 		if (res)
 			goto err_del_bss;
-		need_hw_reconfig = 1;
+		/* we're brought up, everything changes */
+		hw_reconf_flags = ~0;
 		ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 	}
 
@@ -198,8 +199,10 @@ static int ieee80211_open(struct net_device *dev)
 
 		/* must be before the call to ieee80211_configure_filter */
 		local->monitors++;
-		if (local->monitors == 1)
+		if (local->monitors == 1) {
 			local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
+			hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
+		}
 
 		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 			local->fif_fcsfail++;
@@ -279,8 +282,8 @@ static int ieee80211_open(struct net_device *dev)
 		atomic_inc(&local->iff_promiscs);
 
 	local->open_count++;
-	if (need_hw_reconfig) {
-		ieee80211_hw_config(local);
+	if (hw_reconf_flags) {
+		ieee80211_hw_config(local, hw_reconf_flags);
 		/*
 		 * set default queue parameters so drivers don't
 		 * need to initialise the hardware if the hardware
@@ -322,6 +325,7 @@ static int ieee80211_stop(struct net_device *dev)
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_if_init_conf conf;
 	struct sta_info *sta;
+	u32 hw_reconf_flags = 0;
 
 	/*
 	 * Stop TX on this interface first.
@@ -405,8 +409,10 @@ static int ieee80211_stop(struct net_device *dev)
 		}
 
 		local->monitors--;
-		if (local->monitors == 0)
+		if (local->monitors == 0) {
 			local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
+			hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
+		}
 
 		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 			local->fif_fcsfail--;
@@ -504,8 +510,15 @@ static int ieee80211_stop(struct net_device *dev)
 
 		tasklet_disable(&local->tx_pending_tasklet);
 		tasklet_disable(&local->tasklet);
+
+		/* no reconfiguring after stop! */
+		hw_reconf_flags = 0;
 	}
 
+	/* do after stop to avoid reconfiguring when we stop anyway */
+	if (hw_reconf_flags)
+		ieee80211_hw_config(local, hw_reconf_flags);
+
 	return 0;
 }
 
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 07f812755e5..c936017f6d4 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -197,31 +197,34 @@ int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 					    &sdata->vif, &conf);
 }
 
-int ieee80211_hw_config(struct ieee80211_local *local)
+int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 {
 	struct ieee80211_channel *chan;
 	int ret = 0;
+	int power;
 
 	if (local->sw_scanning)
 		chan = local->scan_channel;
 	else
 		chan = local->oper_channel;
 
-	local->hw.conf.channel = chan;
+	if (chan != local->hw.conf.channel) {
+		local->hw.conf.channel = chan;
+		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
+	}
+
 
 	if (!local->hw.conf.power_level)
-		local->hw.conf.power_level = chan->max_power;
+		power = chan->max_power;
 	else
-		local->hw.conf.power_level = min(chan->max_power,
-					       local->hw.conf.power_level);
-
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-	printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
-	       wiphy_name(local->hw.wiphy), chan->center_freq);
-#endif
+		power = min(chan->max_power, local->hw.conf.power_level);
+	if (local->hw.conf.power_level != power) {
+		changed |= IEEE80211_CONF_CHANGE_POWER;
+		local->hw.conf.power_level = power;
+	}
 
-	if (local->open_count) {
-		ret = local->ops->config(local_to_hw(local), &local->hw.conf);
+	if (changed && local->open_count) {
+		ret = local->ops->config(local_to_hw(local), changed);
 		/*
 		 * HW reconfiguration should never fail, the driver has told
 		 * us what it can support so it should live up to that promise.
@@ -672,7 +675,7 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 	local->short_retry_limit = 7;
 	local->long_retry_limit = 4;
-	local->hw.conf.radio_enabled = 1;
+	local->hw.conf.radio_enabled = true;
 
 	INIT_LIST_HEAD(&local->interfaces);
 
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 0989b1c062e..7372d7abb8c 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -448,12 +448,17 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw)
 
 	if (local->hw_scanning) {
 		local->hw_scanning = false;
-		ieee80211_hw_config(local);
+		/*
+		 * Somebody might have requested channel change during scan
+		 * that we won't have acted upon, try now. ieee80211_hw_config
+		 * will set the flag based on actual changes.
+		 */
+		ieee80211_hw_config(local, 0);
 		goto done;
 	}
 
 	local->sw_scanning = false;
-	ieee80211_hw_config(local);
+	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 
 	netif_tx_lock_bh(local->mdev);
 	netif_addr_lock(local->mdev);
@@ -540,7 +545,8 @@ void ieee80211_scan_work(struct work_struct *work)
 
 		if (!skip) {
 			local->scan_channel = chan;
-			if (ieee80211_hw_config(local))
+			if (ieee80211_hw_config(local,
+						IEEE80211_CONF_CHANGE_CHANNEL))
 				skip = 1;
 		}
 
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 9941a60a232..3288c3de67c 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -645,7 +645,8 @@ int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 		if (local->sw_scanning || local->hw_scanning)
 			ret = 0;
 		else
-			ret = ieee80211_hw_config(local);
+			ret = ieee80211_hw_config(
+				local, IEEE80211_CONF_CHANGE_CHANNEL);
 
 		rate_control_clear(local);
 	}
diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c
index a3af1514124..94c4b35eeb1 100644
--- a/net/mac80211/wext.c
+++ b/net/mac80211/wext.c
@@ -656,7 +656,7 @@ static int ieee80211_ioctl_siwtxpower(struct net_device *dev,
 				      union iwreq_data *data, char *extra)
 {
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
-	bool need_reconfig = 0;
+	u32 reconf_flags = 0;
 	int new_power_level;
 
 	if ((data->txpower.flags & IW_TXPOW_TYPE) != IW_TXPOW_DBM)
@@ -680,17 +680,17 @@ static int ieee80211_ioctl_siwtxpower(struct net_device *dev,
 
 	if (local->hw.conf.power_level != new_power_level) {
 		local->hw.conf.power_level = new_power_level;
-		need_reconfig = 1;
+		reconf_flags |= IEEE80211_CONF_CHANGE_POWER;
 	}
 
 	if (local->hw.conf.radio_enabled != !(data->txpower.disabled)) {
 		local->hw.conf.radio_enabled = !(data->txpower.disabled);
-		need_reconfig = 1;
+		reconf_flags |= IEEE80211_CONF_CHANGE_RADIO_ENABLED;
 		ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 	}
 
-	if (need_reconfig)
-		ieee80211_hw_config(local);
+	if (reconf_flags)
+		ieee80211_hw_config(local, reconf_flags);
 
 	return 0;
 }
@@ -976,7 +976,7 @@ static int ieee80211_ioctl_siwpower(struct net_device *dev,
 
 	if (wrq->disabled) {
 		conf->flags &= ~IEEE80211_CONF_PS;
-		return ieee80211_hw_config(local);
+		return ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 	}
 
 	switch (wrq->flags & IW_POWER_MODE) {
@@ -989,7 +989,7 @@ static int ieee80211_ioctl_siwpower(struct net_device *dev,
 		return -EINVAL;
 	}
 
-	return ieee80211_hw_config(local);
+	return ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 }
 
 static int ieee80211_ioctl_giwpower(struct net_device *dev,