iwlwifi: do not call ieee80211_frequency_to_channel

A few cases in iwlwifi driver function ieee80211_frequency_to_channel()
is called to get channel number from center frequency. This is not needed
since the channel number is already saved in hw_value field of struct
ieee80211_channel in function iwlcore_init_geos(). So replace those function
calls with hw_value field of struct ieee80211_channel.
Signed-off-by: Shanyu Zhao <shanyu.zhao@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

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

@@ -1470,7 +1470,7 @@ static int iwl4965_hw_channel_switch(struct iwl_priv *priv,
 
 	cmd.band = band;
 	cmd.expect_beacon = 0;
-	ch = ieee80211_frequency_to_channel(ch_switch->channel->center_freq);
+	ch = ch_switch->channel->hw_value;
 	cmd.channel = cpu_to_le16(ch);
 	cmd.rxon_flags = priv->staging_rxon.flags;
 	cmd.rxon_filter_flags = priv->staging_rxon.filter_flags;

drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -291,7 +291,7 @@ static int iwl5000_hw_channel_switch(struct iwl_priv *priv,
 	};
 
 	cmd.band = priv->band == IEEE80211_BAND_2GHZ;
-	ch = ieee80211_frequency_to_channel(ch_switch->channel->center_freq);
+	ch = ch_switch->channel->hw_value;
 	IWL_DEBUG_11H(priv, "channel switch from %d to %d\n",
 		priv->active_rxon.channel, ch);
 	cmd.channel = cpu_to_le16(ch);

drivers/net/wireless/iwlwifi/iwl-6000.c

@@ -214,7 +214,7 @@ static int iwl6000_hw_channel_switch(struct iwl_priv *priv,
 	};
 
 	cmd.band = priv->band == IEEE80211_BAND_2GHZ;
-	ch = ieee80211_frequency_to_channel(ch_switch->channel->center_freq);
+	ch = ch_switch->channel->hw_value;
 	IWL_DEBUG_11H(priv, "channel switch from %u to %u\n",
 		      priv->active_rxon.channel, ch);
 	cmd.channel = cpu_to_le16(ch);

drivers/net/wireless/iwlwifi/iwl-agn-lib.c

@@ -1098,7 +1098,7 @@ static int iwl_get_channels_for_scan(struct iwl_priv *priv,
 		if (chan->band != band)
 			continue;
 
-		channel = ieee80211_frequency_to_channel(chan->center_freq);
+		channel = chan->hw_value;
 		scan_ch->channel = cpu_to_le16(channel);
 
 		ch_info = iwl_get_channel_info(priv, band, channel);

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

@@ -3655,8 +3655,7 @@ static void iwl_mac_channel_switch(struct ieee80211_hw *hw,
 	mutex_lock(&priv->mutex);
 	if (priv->cfg->ops->lib->set_channel_switch) {
 
-		ch = ieee80211_frequency_to_channel(
-			ch_switch->channel->center_freq);
+		ch = ch_switch->channel->hw_value;
 		if (le16_to_cpu(priv->active_rxon.channel) != ch) {
 			ch_info = iwl_get_channel_info(priv,
 						       conf->channel->band,

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

@@ -916,7 +916,7 @@ EXPORT_SYMBOL(iwl_get_single_channel_number);
 int iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch)
 {
 	enum ieee80211_band band = ch->band;
-	u16 channel = ieee80211_frequency_to_channel(ch->center_freq);
+	u16 channel = ch->hw_value;
 
 	if (!iwl_get_channel_info(priv, band, channel)) {
 		IWL_DEBUG_INFO(priv, "Could not set channel to %d [%d]\n",
@@ -2032,7 +2032,7 @@ int iwl_mac_config(struct ieee80211_hw *hw, u32 changed)
 		if (scan_active)
 			goto set_ch_out;
 
-		ch = ieee80211_frequency_to_channel(conf->channel->center_freq);
+		ch = conf->channel->hw_value;
 		ch_info = iwl_get_channel_info(priv, conf->channel->band, ch);
 		if (!is_channel_valid(ch_info)) {
 			IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");

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

@@ -467,8 +467,7 @@ static ssize_t iwl_dbgfs_channels_read(struct file *file, char __user *user_buf,
 		for (i = 0; i < supp_band->n_channels; i++)
 			pos += scnprintf(buf + pos, bufsz - pos,
 					"%d: %ddBm: BSS%s%s, %s.\n",
-					ieee80211_frequency_to_channel(
-					channels[i].center_freq),
+					channels[i].hw_value,
 					channels[i].max_power,
 					channels[i].flags & IEEE80211_CHAN_RADAR ?
 					" (IEEE 802.11h required)" : "",
@@ -491,8 +490,7 @@ static ssize_t iwl_dbgfs_channels_read(struct file *file, char __user *user_buf,
 		for (i = 0; i < supp_band->n_channels; i++)
 			pos += scnprintf(buf + pos, bufsz - pos,
 					"%d: %ddBm: BSS%s%s, %s.\n",
-					ieee80211_frequency_to_channel(
-					channels[i].center_freq),
+					channels[i].hw_value,
 					channels[i].max_power,
 					channels[i].flags & IEEE80211_CHAN_RADAR ?
 					" (IEEE 802.11h required)" : "",