mac80211: refactor freeing the next_beacon

We have this code seven times, refactor it into a
separate function.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/cfg.c

@@ -1348,6 +1348,16 @@ static int ieee80211_change_beacon(struct wiphy *wiphy, struct net_device *dev,
 	return 0;
 }
 
+static void ieee80211_free_next_beacon(struct ieee80211_sub_if_data *sdata)
+{
+	if (!sdata->u.ap.next_beacon)
+		return;
+
+	kfree(sdata->u.ap.next_beacon->mbssid_ies);
+	kfree(sdata->u.ap.next_beacon);
+	sdata->u.ap.next_beacon = NULL;
+}
+
 static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
@@ -1382,11 +1392,7 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
 
 	mutex_unlock(&local->mtx);
 
-	if (sdata->u.ap.next_beacon) {
-		kfree(sdata->u.ap.next_beacon->mbssid_ies);
-		kfree(sdata->u.ap.next_beacon);
-		sdata->u.ap.next_beacon = NULL;
-	}
+	ieee80211_free_next_beacon(sdata);
 
 	/* turn off carrier for this interface and dependent VLANs */
 	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
@@ -3321,9 +3327,7 @@ static int ieee80211_set_after_csa_beacon(struct ieee80211_sub_if_data *sdata,
 
 		err = ieee80211_assign_beacon(sdata, sdata->u.ap.next_beacon,
 					      NULL, NULL);
-		kfree(sdata->u.ap.next_beacon->mbssid_ies);
-		kfree(sdata->u.ap.next_beacon);
-		sdata->u.ap.next_beacon = NULL;
+		ieee80211_free_next_beacon(sdata);
 
 		if (err < 0)
 			return err;
@@ -3479,9 +3483,7 @@ static int ieee80211_set_csa_beacon(struct ieee80211_sub_if_data *sdata,
 		     IEEE80211_MAX_CNTDWN_COUNTERS_NUM) ||
 		    (params->n_counter_offsets_presp >
 		     IEEE80211_MAX_CNTDWN_COUNTERS_NUM)) {
-			kfree(sdata->u.ap.next_beacon->mbssid_ies);
-			kfree(sdata->u.ap.next_beacon);
-			sdata->u.ap.next_beacon = NULL;
+			ieee80211_free_next_beacon(sdata);
 			return -EINVAL;
 		}
 
@@ -3493,9 +3495,7 @@ static int ieee80211_set_csa_beacon(struct ieee80211_sub_if_data *sdata,
 
 		err = ieee80211_assign_beacon(sdata, &params->beacon_csa, &csa, NULL);
 		if (err < 0) {
-			kfree(sdata->u.ap.next_beacon->mbssid_ies);
-			kfree(sdata->u.ap.next_beacon);
-			sdata->u.ap.next_beacon = NULL;
+			ieee80211_free_next_beacon(sdata);
 			return err;
 		}
 		*changed |= err;
@@ -3585,11 +3585,8 @@ static int ieee80211_set_csa_beacon(struct ieee80211_sub_if_data *sdata,
 static void ieee80211_color_change_abort(struct ieee80211_sub_if_data  *sdata)
 {
 	sdata->vif.color_change_active = false;
-	if (sdata->u.ap.next_beacon) {
-		kfree(sdata->u.ap.next_beacon->mbssid_ies);
-		kfree(sdata->u.ap.next_beacon);
-		sdata->u.ap.next_beacon = NULL;
-	}
+
+	ieee80211_free_next_beacon(sdata);
 
 	cfg80211_color_change_aborted_notify(sdata->dev);
 }
@@ -4330,9 +4327,7 @@ ieee80211_set_after_color_change_beacon(struct ieee80211_sub_if_data *sdata,
 
 		ret = ieee80211_assign_beacon(sdata, sdata->u.ap.next_beacon,
 					      NULL, NULL);
-		kfree(sdata->u.ap.next_beacon->mbssid_ies);
-		kfree(sdata->u.ap.next_beacon);
-		sdata->u.ap.next_beacon = NULL;
+		ieee80211_free_next_beacon(sdata);
 
 		if (ret < 0)
 			return ret;
@@ -4375,11 +4370,7 @@ ieee80211_set_color_change_beacon(struct ieee80211_sub_if_data *sdata,
 		err = ieee80211_assign_beacon(sdata, &params->beacon_color_change,
 					      NULL, &color_change);
 		if (err < 0) {
-			if (sdata->u.ap.next_beacon) {
-				kfree(sdata->u.ap.next_beacon->mbssid_ies);
-				kfree(sdata->u.ap.next_beacon);
-				sdata->u.ap.next_beacon = NULL;
-			}
+			ieee80211_free_next_beacon(sdata);
 			return err;
 		}
 		*changed |= err;