From 0fa2d4c851891a660074edc09840adbb9f4c7878 Mon Sep 17 00:00:00 2001
From: poornakumar-pk <poornakumar_mezhiselvam@comcast.com>
Date: Tue, 6 Oct 2026 10:30:03 +0530
Subject: [PATCH] LTE-3100: DFS channel can't be reuse for BH on nop_started

Reason for change: It prevents the STA connection attempt when the candidate is invalid
Test Procedure: check XLE not use same channel while it is in the nop_started state
Risks:
Priority: P1
Signed-off-by: poornakumar_mezhiselvam@comcast.com
---
 source/core/services/vap_svc_mesh_ext.c | 64 +++++++++++++++++++++++++
 source/utils/wifi_util.c                |  6 ++-
 2 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/source/core/services/vap_svc_mesh_ext.c b/source/core/services/vap_svc_mesh_ext.c
index fd9a422c3a..4b1e564901 100644
--- a/source/core/services/vap_svc_mesh_ext.c
+++ b/source/core/services/vap_svc_mesh_ext.c
@@ -1064,9 +1064,20 @@ void ext_try_connecting(vap_svc_t *svc)
     bss_candidate_t *new_bss = NULL;
     bss_candidate_t *last_connected_bss = NULL;
     bool found_at_least_one_candidate = false;
+    bool candidate_valid;
     wifi_ctrl_t *ctrl;
+    wifi_mgr_t *mgr;
+    wifi_radio_operationParam_t *radio_params;
+    wifi_radio_operationParam_t *candidate_params;
+    unsigned char candidate_channel;
 
     ctrl = svc->ctrl;
+    mgr = (wifi_mgr_t *)get_wifimgr_obj();
+    if (mgr == NULL) {
+        wifi_util_error_print(WIFI_CTRL, "%s:%d: failed to get wifi manager\n",
+            __func__, __LINE__);
+        return;
+    }
     ext = &svc->u.ext;
 
     if (ext->conn_state == connection_state_connection_to_nb_in_progress) {
@@ -1161,6 +1172,59 @@ void ext_try_connecting(vap_svc_t *svc)
             return;
         }
         vap_index = get_sta_vap_index_for_radio(svc->prop, radio_index);
+        radio_params = get_wifidb_radio_map(radio_index);
+        if (radio_params == NULL) {
+            wifi_util_error_print(WIFI_CTRL,
+                "%s:%d: failed to get radio parameters for radio index %d\n", __func__, __LINE__,
+                radio_index);
+            return;
+        }
+
+        candidate_channel = 0;
+        convert_freq_to_channel(candidate->external_ap.freq, &candidate_channel);
+        candidate_params = (wifi_radio_operationParam_t *)malloc(sizeof(wifi_radio_operationParam_t));
+        if (candidate_params == NULL) {
+            wifi_util_error_print(WIFI_CTRL, "%s:%d: failed to allocate candidate radio parameters\n",
+                __func__, __LINE__);
+            return;
+        }
+
+        pthread_mutex_lock(&mgr->data_cache_lock);
+        memcpy(candidate_params, radio_params, sizeof(wifi_radio_operationParam_t));
+        pthread_mutex_unlock(&mgr->data_cache_lock);
+
+        candidate_params->channel = candidate_channel;
+        if (candidate->external_ap.oper_chan_bw != 0) {
+            candidate_params->channelWidth = candidate->external_ap.oper_chan_bw;
+        }
+
+        candidate_valid = (candidate_channel != 0) &&
+            (wifi_radio_operationParam_validation(&mgr->hal_cap, candidate_params) == RETURN_OK);
+        free(candidate_params);
+        candidate_params = NULL;
+
+        if (!candidate_valid) {
+            wifi_util_error_print(WIFI_CTRL,
+                "%s:%d: rejecting backhaul candidate bssid:%s freq:%d; channel is unavailable\n",
+                __func__, __LINE__, to_mac_str(candidate->external_ap.bssid, bssid_str),
+                candidate->external_ap.freq);
+
+            if (ext->conn_state == connection_state_connection_to_nb_in_progress) {
+                memset(&ext->new_bss, 0, sizeof(ext->new_bss));
+                ext_set_conn_state(ext, connection_state_disconnected_scan_list_none, __func__,
+                    __LINE__);
+            } else if (ext->conn_state == connection_state_connection_to_lcb_in_progress) {
+                memset(&ext->last_connected_bss, 0, sizeof(ext->last_connected_bss));
+                ext_set_conn_state(ext, connection_state_disconnected_scan_list_none, __func__,
+                    __LINE__);
+            } else {
+                candidate->conn_attempt = connection_attempt_failed;
+                candidate->conn_retry_attempt = STA_MAX_CONNECT_ATTEMPT;
+            }
+
+            schedule_connect_sm(svc);
+            return;
+        }
         if (ctrl->rf_status_down == true) {
             hotspot_timing_target_detected();
         }
diff --git a/source/utils/wifi_util.c b/source/utils/wifi_util.c
index 433f404e23..1c7ba6a7e2 100644
--- a/source/utils/wifi_util.c
+++ b/source/utils/wifi_util.c
@@ -3732,8 +3732,10 @@ int wifi_radio_operationParam_validation(wifi_hal_capability_t  *hal_cap, wifi_r
             is_valid = true;
         }
 
-        //If radar was detected on the selected DFS channel, return error
-        if( (oper->channel >= 52  &&  oper->channel <=144) ) {
+        //If radar was detected in the selected 5GHz operating block, return error
+        if (is_valid &&
+            (is_5g_20M_channel_in_dfs(oper->channel) ||
+             oper->channelWidth == WIFI_CHANNELBANDWIDTH_160MHZ)) {
             UINT inputChannelBlock = 0;
             UINT firstChannelInBand = 36;
             int blockStartChannel = 0;