diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index f111f8d..032081c 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2988,28 +2988,26 @@
 	return new_beacon;
 }
 
-void ieee80211_csa_finalize_work(struct work_struct *work)
+void ieee80211_csa_finish(struct ieee80211_vif *vif)
 {
-	struct ieee80211_sub_if_data *sdata =
-		container_of(work, struct ieee80211_sub_if_data,
-			     csa_finalize_work);
+	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+
+	ieee80211_queue_work(&sdata->local->hw,
+			     &sdata->csa_finalize_work);
+}
+EXPORT_SYMBOL(ieee80211_csa_finish);
+
+static void ieee80211_csa_finalize(struct ieee80211_sub_if_data *sdata)
+{
 	struct ieee80211_local *local = sdata->local;
 	int err, changed = 0;
 
-	sdata_lock(sdata);
-	/* AP might have been stopped while waiting for the lock. */
-	if (!sdata->vif.csa_active)
-		goto unlock;
-
-	if (!ieee80211_sdata_running(sdata))
-		goto unlock;
-
 	sdata->radar_required = sdata->csa_radar_required;
 	mutex_lock(&local->mtx);
 	err = ieee80211_vif_change_channel(sdata, &changed);
 	mutex_unlock(&local->mtx);
 	if (WARN_ON(err < 0))
-		goto unlock;
+		return;
 
 	if (!local->use_chanctx) {
 		local->_oper_chandef = sdata->csa_chandef;
@@ -3023,7 +3021,7 @@
 	case NL80211_IFTYPE_AP:
 		err = ieee80211_assign_beacon(sdata, sdata->u.ap.next_beacon);
 		if (err < 0)
-			goto unlock;
+			return;
 
 		changed |= err;
 		kfree(sdata->u.ap.next_beacon);
@@ -3038,12 +3036,12 @@
 	case NL80211_IFTYPE_MESH_POINT:
 		err = ieee80211_mesh_finish_csa(sdata);
 		if (err < 0)
-			goto unlock;
+			return;
 		break;
 #endif
 	default:
 		WARN_ON(1);
-		goto unlock;
+		return;
 	}
 
 	ieee80211_wake_queues_by_reason(&sdata->local->hw,
@@ -3051,6 +3049,23 @@
 					IEEE80211_QUEUE_STOP_REASON_CSA);
 
 	cfg80211_ch_switch_notify(sdata->dev, &sdata->csa_chandef);
+}
+
+void ieee80211_csa_finalize_work(struct work_struct *work)
+{
+	struct ieee80211_sub_if_data *sdata =
+		container_of(work, struct ieee80211_sub_if_data,
+			     csa_finalize_work);
+
+	sdata_lock(sdata);
+	/* AP might have been stopped while waiting for the lock. */
+	if (!sdata->vif.csa_active)
+		goto unlock;
+
+	if (!ieee80211_sdata_running(sdata))
+		goto unlock;
+
+	ieee80211_csa_finalize(sdata);
 
 unlock:
 	sdata_unlock(sdata);
@@ -3064,7 +3079,7 @@
 	struct ieee80211_chanctx_conf *chanctx_conf;
 	struct ieee80211_chanctx *chanctx;
 	struct ieee80211_if_mesh __maybe_unused *ifmsh;
-	int err, num_chanctx;
+	int err, num_chanctx, changed = 0;
 
 	lockdep_assert_held(&sdata->wdev.mtx);
 
@@ -3105,19 +3120,40 @@
 
 	switch (sdata->vif.type) {
 	case NL80211_IFTYPE_AP:
-		sdata->csa_counter_offset_beacon =
-			params->counter_offset_beacon;
-		sdata->csa_counter_offset_presp = params->counter_offset_presp;
 		sdata->u.ap.next_beacon =
 			cfg80211_beacon_dup(&params->beacon_after);
 		if (!sdata->u.ap.next_beacon)
 			return -ENOMEM;
 
+		/*
+		 * With a count of 0, we don't have to wait for any
+		 * TBTT before switching, so complete the CSA
+		 * immediately.  In theory, with a count == 1 we
+		 * should delay the switch until just before the next
+		 * TBTT, but that would complicate things so we switch
+		 * immediately too.  If we would delay the switch
+		 * until the next TBTT, we would have to set the probe
+		 * response here.
+		 *
+		 * TODO: A channel switch with count <= 1 without
+		 * sending a CSA action frame is kind of useless,
+		 * because the clients won't know we're changing
+		 * channels.  The action frame must be implemented
+		 * either here or in the userspace.
+		 */
+		if (params->count <= 1)
+			break;
+
+		sdata->csa_counter_offset_beacon =
+			params->counter_offset_beacon;
+		sdata->csa_counter_offset_presp = params->counter_offset_presp;
 		err = ieee80211_assign_beacon(sdata, &params->beacon_csa);
 		if (err < 0) {
 			kfree(sdata->u.ap.next_beacon);
 			return err;
 		}
+		changed |= err;
+
 		break;
 	case NL80211_IFTYPE_ADHOC:
 		if (!sdata->vif.bss_conf.ibss_joined)
@@ -3145,9 +3181,16 @@
 		    params->chandef.chan->band)
 			return -EINVAL;
 
-		err = ieee80211_ibss_csa_beacon(sdata, params);
-		if (err < 0)
-			return err;
+		/* see comments in the NL80211_IFTYPE_AP block */
+		if (params->count > 1) {
+			err = ieee80211_ibss_csa_beacon(sdata, params);
+			if (err < 0)
+				return err;
+			changed |= err;
+		}
+
+		ieee80211_send_action_csa(sdata, params);
+
 		break;
 #ifdef CONFIG_MAC80211_MESH
 	case NL80211_IFTYPE_MESH_POINT:
@@ -3172,12 +3215,19 @@
 		if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_NONE)
 			ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_INIT;
 
-		err = ieee80211_mesh_csa_beacon(sdata, params,
-			(ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT));
-		if (err < 0) {
-			ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
-			return err;
+		/* see comments in the NL80211_IFTYPE_AP block */
+		if (params->count > 1) {
+			err = ieee80211_mesh_csa_beacon(sdata, params);
+			if (err < 0) {
+				ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
+				return err;
+			}
+			changed |= err;
 		}
+
+		if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT)
+			ieee80211_send_action_csa(sdata, params);
+
 		break;
 #endif
 	default:
@@ -3194,8 +3244,13 @@
 	sdata->csa_chandef = params->chandef;
 	sdata->vif.csa_active = true;
 
-	ieee80211_bss_info_change_notify(sdata, err);
-	drv_channel_switch_beacon(sdata, &params->chandef);
+	if (changed) {
+		ieee80211_bss_info_change_notify(sdata, changed);
+		drv_channel_switch_beacon(sdata, &params->chandef);
+	} else {
+		/* if the beacon didn't change, we can finalize immediately */
+		ieee80211_csa_finalize(sdata);
+	}
 
 	return 0;
 }