mac80211: allow SMPS requests only in client mode

The code currently allows this for AP mode, but then ignores
it. Clarify that since the spec doesn't allow it in AP mode.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210618133832.0465f8bcbe32.Iba39fc559ecfa887be00a5f3beabd881e5c86e54@changeidSigned-off-by: NJohannes Berg <johannes.berg@intel.com>

net/mac80211/ht.c

@@ -9,7 +9,7 @@
  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  * Copyright 2007-2010, Intel Corporation
  * Copyright 2017	Intel Deutschland GmbH
- * Copyright(c) 2020 Intel Corporation
+ * Copyright(c) 2020-2021 Intel Corporation
  */
 
 #include <linux/ieee80211.h>
@@ -555,17 +555,15 @@ void ieee80211_request_smps(struct ieee80211_vif *vif,
 {
 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 
-	if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION &&
-			 vif->type != NL80211_IFTYPE_AP))
+	if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
 		return;
 
-	if (vif->type == NL80211_IFTYPE_STATION) {
-		if (sdata->u.mgd.driver_smps_mode == smps_mode)
-			return;
-		sdata->u.mgd.driver_smps_mode = smps_mode;
-		ieee80211_queue_work(&sdata->local->hw,
-				     &sdata->u.mgd.request_smps_work);
-	}
+	if (sdata->u.mgd.driver_smps_mode == smps_mode)
+		return;
+
+	sdata->u.mgd.driver_smps_mode = smps_mode;
+	ieee80211_queue_work(&sdata->local->hw,
+			     &sdata->u.mgd.request_smps_work);
 }
 /* this might change ... don't want non-open drivers using it */
 EXPORT_SYMBOL_GPL(ieee80211_request_smps);