wifi: mac80211: use link_id in ieee80211_change_bss()

We should set the parameters here per link, except
unfortunately ap_isolate, but we can't really change
that anymore so it'll remain a quirk in the API in
that you need to change it on one of the valid links
and it'll apply to all.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/cfg.c

@@ -2554,47 +2554,50 @@ static int ieee80211_change_bss(struct wiphy *wiphy,
 				struct bss_parameters *params)
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	struct ieee80211_link_data *link;
 	struct ieee80211_supported_band *sband;
 	u32 changed = 0;
 
-	if (!sdata_dereference(sdata->deflink.u.ap.beacon, sdata))
+	link = ieee80211_link_or_deflink(sdata, params->link_id, true);
+	if (IS_ERR(link))
+		return PTR_ERR(link);
+
+	if (!sdata_dereference(link->u.ap.beacon, sdata))
 		return -ENOENT;
 
-	sband = ieee80211_get_sband(sdata);
+	sband = ieee80211_get_link_sband(link);
 	if (!sband)
 		return -EINVAL;
 
 	if (params->use_cts_prot >= 0) {
-		sdata->vif.bss_conf.use_cts_prot = params->use_cts_prot;
+		link->conf->use_cts_prot = params->use_cts_prot;
 		changed |= BSS_CHANGED_ERP_CTS_PROT;
 	}
 	if (params->use_short_preamble >= 0) {
-		sdata->vif.bss_conf.use_short_preamble =
-			params->use_short_preamble;
+		link->conf->use_short_preamble = params->use_short_preamble;
 		changed |= BSS_CHANGED_ERP_PREAMBLE;
 	}
 
-	if (!sdata->vif.bss_conf.use_short_slot &&
+	if (!link->conf->use_short_slot &&
 	    (sband->band == NL80211_BAND_5GHZ ||
 	     sband->band == NL80211_BAND_6GHZ)) {
-		sdata->vif.bss_conf.use_short_slot = true;
+		link->conf->use_short_slot = true;
 		changed |= BSS_CHANGED_ERP_SLOT;
 	}
 
 	if (params->use_short_slot_time >= 0) {
-		sdata->vif.bss_conf.use_short_slot =
-			params->use_short_slot_time;
+		link->conf->use_short_slot = params->use_short_slot_time;
 		changed |= BSS_CHANGED_ERP_SLOT;
 	}
 
 	if (params->basic_rates) {
-		ieee80211_parse_bitrates(sdata->vif.bss_conf.chandef.width,
+		ieee80211_parse_bitrates(link->conf->chandef.width,
 					 wiphy->bands[sband->band],
 					 params->basic_rates,
 					 params->basic_rates_len,
-					 &sdata->vif.bss_conf.basic_rates);
+					 &link->conf->basic_rates);
 		changed |= BSS_CHANGED_BASIC_RATES;
-		ieee80211_check_rate_mask(&sdata->deflink);
+		ieee80211_check_rate_mask(link);
 	}
 
 	if (params->ap_isolate >= 0) {
@@ -2606,30 +2609,29 @@ static int ieee80211_change_bss(struct wiphy *wiphy,
 	}
 
 	if (params->ht_opmode >= 0) {
-		sdata->vif.bss_conf.ht_operation_mode =
-			(u16) params->ht_opmode;
+		link->conf->ht_operation_mode = (u16)params->ht_opmode;
 		changed |= BSS_CHANGED_HT;
 	}
 
 	if (params->p2p_ctwindow >= 0) {
-		sdata->vif.bss_conf.p2p_noa_attr.oppps_ctwindow &=
+		link->conf->p2p_noa_attr.oppps_ctwindow &=
 					~IEEE80211_P2P_OPPPS_CTWINDOW_MASK;
-		sdata->vif.bss_conf.p2p_noa_attr.oppps_ctwindow |=
+		link->conf->p2p_noa_attr.oppps_ctwindow |=
 			params->p2p_ctwindow & IEEE80211_P2P_OPPPS_CTWINDOW_MASK;
 		changed |= BSS_CHANGED_P2P_PS;
 	}
 
 	if (params->p2p_opp_ps > 0) {
-		sdata->vif.bss_conf.p2p_noa_attr.oppps_ctwindow |=
+		link->conf->p2p_noa_attr.oppps_ctwindow |=
 					IEEE80211_P2P_OPPPS_ENABLE_BIT;
 		changed |= BSS_CHANGED_P2P_PS;
 	} else if (params->p2p_opp_ps == 0) {
-		sdata->vif.bss_conf.p2p_noa_attr.oppps_ctwindow &=
+		link->conf->p2p_noa_attr.oppps_ctwindow &=
 					~IEEE80211_P2P_OPPPS_ENABLE_BIT;
 		changed |= BSS_CHANGED_P2P_PS;
 	}
 
-	ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
+	ieee80211_link_info_change_notify(sdata, link, changed);
 
 	return 0;
 }