qcacld-3.0: Don't do CSA on DFS channel in Non-DBS HW

In case of Non-DBS HW, don't allow channel to switch
to DFS channel or 160 Mhz BW in 5 Ghz, if STA is not
connected.

This is done because in Non-DBS HW, Monitoring mode
is disabled as sta_sap_scc_on_dfs_chnl is forced to
1.

Change-Id: Ie30a38a6c5155ca2b6f11f602fb51a43ca2e323e
CRs-Fixed: 2916799

core/hdd/src/wlan_hdd_hostapd.c

@@ -2988,6 +2988,7 @@ int hdd_softap_set_channel_change(struct net_device *dev, int target_chan_freq,
 	bool is_p2p_go_session = false;
 	struct wlan_objmgr_vdev *vdev;
 	bool strict;
+	uint32_t sta_cnt = 0;
 
 	hdd_ctx = WLAN_HDD_GET_CTX(adapter);
 	ret = wlan_hdd_validate_context(hdd_ctx);
@@ -3033,6 +3034,21 @@ int hdd_softap_set_channel_change(struct net_device *dev, int target_chan_freq,
 		}
 	}
 
+	sta_cnt = policy_mgr_mode_specific_connection_count(hdd_ctx->psoc,
+							    PM_STA_MODE,
+							    NULL);
+	/*
+	 * For non-dbs HW, don't allow Channel switch on DFS channel if STA is
+	 * not connected.
+	 */
+	if (!sta_cnt && !policy_mgr_is_hw_dbs_capable(hdd_ctx->psoc) &&
+	    (wlan_reg_is_dfs_for_freq(hdd_ctx->pdev, target_chan_freq) ||
+	    (wlan_reg_is_5ghz_ch_freq(target_chan_freq) &&
+	     target_bw == CH_WIDTH_160MHZ))) {
+		hdd_debug("Channel switch not allowed for non-DBS HW on DFS channel %d width %d", target_chan_freq, target_bw);
+		return -EINVAL;
+	}
+
 	/*
 	 * Set the ch_switch_in_progress flag to mimic channel change
 	 * when a radar is found. This will enable synchronizing