iwlagn: refactor iwlagn_mac_channel_switch

Use less indentions and remove uneeded irq-save flags.
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -2916,7 +2916,6 @@ static void iwlagn_mac_channel_switch(struct ieee80211_hw *hw,
 	 */
 	struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 	u16 ch;
-	unsigned long flags = 0;
 
 	IWL_DEBUG_MAC80211(priv, "enter\n");
 
@@ -2933,18 +2932,20 @@ static void iwlagn_mac_channel_switch(struct ieee80211_hw *hw,
 	if (!iwl_is_associated_ctx(ctx))
 		goto out;
 
-	if (priv->cfg->ops->lib->set_channel_switch) {
+	if (!priv->cfg->ops->lib->set_channel_switch)
+		goto out;
 
 	ch = channel->hw_value;
-		if (le16_to_cpu(ctx->active.channel) != ch) {
-			ch_info = iwl_get_channel_info(priv,
-						       channel->band,
-						       ch);
+	if (le16_to_cpu(ctx->active.channel) == ch)
+		goto out;
+
+	ch_info = iwl_get_channel_info(priv, channel->band, ch);
 	if (!is_channel_valid(ch_info)) {
 		IWL_DEBUG_MAC80211(priv, "invalid channel\n");
 		goto out;
 	}
-			spin_lock_irqsave(&priv->lock, flags);
+
+	spin_lock_irq(&priv->lock);
 
 	priv->current_ht_config.smps = conf->smps_mode;
 
@@ -2972,9 +2973,9 @@ static void iwlagn_mac_channel_switch(struct ieee80211_hw *hw,
 
 	iwl_set_rxon_channel(priv, channel, ctx);
 	iwl_set_rxon_ht(priv, ht_conf);
-			iwl_set_flags_for_band(priv, ctx, channel->band,
-					       ctx->vif);
-			spin_unlock_irqrestore(&priv->lock, flags);
+	iwl_set_flags_for_band(priv, ctx, channel->band, ctx->vif);
+
+	spin_unlock_irq(&priv->lock);
 
 	iwl_set_rate(priv);
 	/*
@@ -2983,15 +2984,12 @@ static void iwlagn_mac_channel_switch(struct ieee80211_hw *hw,
 	 */
 	set_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status);
 	priv->switch_channel = cpu_to_le16(ch);
-			if (priv->cfg->ops->lib->set_channel_switch(priv,
-								    ch_switch)) {
-				clear_bit(STATUS_CHANNEL_SWITCH_PENDING,
-					  &priv->status);
+	if (priv->cfg->ops->lib->set_channel_switch(priv, ch_switch)) {
+		clear_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status);
 		priv->switch_channel = 0;
 		ieee80211_chswitch_done(ctx->vif, false);
 	}
-		}
-	}
+
 out:
 	mutex_unlock(&priv->mutex);
 	IWL_DEBUG_MAC80211(priv, "leave\n");