wifi: iwlwifi: mvm: fix DTIM skip powersave config

When entering D3 we want to configure skip over DTIM, but
it can't use the deflink configuration, that will not even
exist. Adjust the code to handle multiple links by taking
the min skip, even if we should only have a single active
link at this point.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240605140327.bccf980fadb4.Idc98b9f3634f39d2fae9bd9916f5d050ccd48f95@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

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

@@ -282,62 +282,64 @@ static bool iwl_mvm_power_allow_uapsd(struct iwl_mvm *mvm,
 	return data.allow_uapsd;
 }
 
-static bool iwl_mvm_power_is_radar(struct ieee80211_vif *vif)
+static bool iwl_mvm_power_is_radar(struct ieee80211_bss_conf *link_conf)
 {
 	struct ieee80211_chanctx_conf *chanctx_conf;
-	struct ieee80211_bss_conf *link_conf;
-	bool radar_detect = false;
-	unsigned int link_id;
 
-	rcu_read_lock();
-	for_each_vif_active_link(vif, link_conf, link_id) {
-		chanctx_conf = rcu_dereference(link_conf->chanctx_conf);
-		/* this happens on link switching, just ignore inactive ones */
-		if (!chanctx_conf)
-			continue;
+	chanctx_conf = rcu_dereference(link_conf->chanctx_conf);
 
-		radar_detect = !!(chanctx_conf->def.chan->flags &
-				  IEEE80211_CHAN_RADAR);
-		if (radar_detect)
-			goto out;
-	}
+	/* this happens on link switching, just ignore inactive ones */
+	if (!chanctx_conf)
+		return false;
 
-out:
-	rcu_read_unlock();
-	return radar_detect;
+	return chanctx_conf->def.chan->flags & IEEE80211_CHAN_RADAR;
 }
 
 static void iwl_mvm_power_config_skip_dtim(struct iwl_mvm *mvm,
 					   struct ieee80211_vif *vif,
 					   struct iwl_mac_power_cmd *cmd)
 {
-	int dtimper = vif->bss_conf.dtim_period ?: 1;
-	int skip;
+	struct ieee80211_bss_conf *link_conf;
+	unsigned int min_link_skip = ~0;
+	unsigned int link_id;
 
 	/* disable, in case we're supposed to override */
 	cmd->skip_dtim_periods = 0;
 	cmd->flags &= ~cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);
 
-	if (iwl_mvm_power_is_radar(vif))
+	if (!test_bit(IWL_MVM_STATUS_IN_D3, &mvm->status)) {
+		if (iwlmvm_mod_params.power_scheme != IWL_POWER_SCHEME_LP)
+			return;
+		cmd->skip_dtim_periods = 2;
+		cmd->flags |= cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);
 		return;
+	}
 
-	if (dtimper >= 10)
-		return;
+	rcu_read_lock();
+	for_each_vif_active_link(vif, link_conf, link_id) {
+		unsigned int dtimper = link_conf->dtim_period ?: 1;
+		unsigned int dtimper_tu = dtimper * link_conf->beacon_int;
+		unsigned int skip;
 
-	if (!test_bit(IWL_MVM_STATUS_IN_D3, &mvm->status)) {
-		if (iwlmvm_mod_params.power_scheme != IWL_POWER_SCHEME_LP)
+		if (dtimper >= 10 || iwl_mvm_power_is_radar(link_conf)) {
+			rcu_read_unlock();
 			return;
-		skip = 2;
-	} else {
-		int dtimper_tu = dtimper * vif->bss_conf.beacon_int;
+		}
 
 		if (WARN_ON(!dtimper_tu))
-			return;
+			continue;
+
 		/* configure skip over dtim up to 900 TU DTIM interval */
-		skip = max_t(u8, 1, 900 / dtimper_tu);
+		skip = max_t(int, 1, 900 / dtimper_tu);
+		min_link_skip = min(min_link_skip, skip);
 	}
+	rcu_read_unlock();
+
+	/* no WARN_ON, can only happen with WARN_ON above */
+	if (min_link_skip == ~0)
+		return;
 
-	cmd->skip_dtim_periods = skip;
+	cmd->skip_dtim_periods = min_link_skip;
 	cmd->flags |= cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);
 }