wifi: iwlwifi: mvm: avoid link lookup in statistics

We already iterate the link bss_conf/link_info and have the
pointer, or know that deflink/bss_conf is used, so avoid an
extra lookup and just pass the pointer. This may also avoid
a crash when this is processed during restart, where the FW
to link conf array (link_id_to_link_conf) may be NULLed out.

Fixes: c1e458b ("wifi: iwlwifi: mvm: Move beacon filtering to be per link")
Signed-off-by: Johannes Berg <[email protected]>
Reviewed-by: Ilan Peer <[email protected]>
Signed-off-by: Miri Korenblit <[email protected]>
Link: https://patch.msgid.link/20240703064026.346a6ef67a86.Iba5d65d728ca9f58518c88d029496c1250670544@changeid
Signed-off-by: Johannes Berg <[email protected]>

drivers/net/wireless/intel/iwlwifi/mvm/rx.c

@@ -557,12 +557,10 @@ struct iwl_mvm_stat_data_all_macs {
 };
 
 static void iwl_mvm_update_link_sig(struct ieee80211_vif *vif, int sig,
-				    struct iwl_mvm_vif_link_info *link_info)
+				    struct iwl_mvm_vif_link_info *link_info,
+				    struct ieee80211_bss_conf *bss_conf)
 {
 	struct iwl_mvm *mvm = iwl_mvm_vif_from_mac80211(vif)->mvm;
-	struct ieee80211_bss_conf *bss_conf =
-		iwl_mvm_rcu_fw_link_id_to_link_conf(mvm, link_info->fw_link_id,
-						    false);
 	int thold = bss_conf->cqm_rssi_thold;
 	int hyst = bss_conf->cqm_rssi_hyst;
 	int last_event;
@@ -670,7 +668,7 @@ static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 			mvmvif->deflink.beacon_stats.num_beacons;
 
 	/* This is used in pre-MLO API so use deflink */
-	iwl_mvm_update_link_sig(vif, sig, &mvmvif->deflink);
+	iwl_mvm_update_link_sig(vif, sig, &mvmvif->deflink, &vif->bss_conf);
 }
 
 static void iwl_mvm_stat_iterator_all_macs(void *_data, u8 *mac,
@@ -705,7 +703,7 @@ static void iwl_mvm_stat_iterator_all_macs(void *_data, u8 *mac,
 	sig = -le32_to_cpu(mac_stats->beacon_filter_average_energy);
 
 	/* This is used in pre-MLO API so use deflink */
-	iwl_mvm_update_link_sig(vif, sig, &mvmvif->deflink);
+	iwl_mvm_update_link_sig(vif, sig, &mvmvif->deflink, &vif->bss_conf);
 }
 
 static inline void
@@ -921,7 +919,8 @@ iwl_mvm_stat_iterator_all_links(struct iwl_mvm *mvm,
 				mvmvif->link[link_id]->beacon_stats.num_beacons;
 
 		sig = -le32_to_cpu(link_stats->beacon_filter_average_energy);
-		iwl_mvm_update_link_sig(bss_conf->vif, sig, link_info);
+		iwl_mvm_update_link_sig(bss_conf->vif, sig, link_info,
+					bss_conf);
 
 		if (WARN_ONCE(mvmvif->id >= MAC_INDEX_AUX,
 			      "invalid mvmvif id: %d", mvmvif->id))