qcacld-3.0: protect the reject ap list with mutex lock

Any operation on the reject ap list should be protected
by the mutex lock, otherwise, race condition may happen
and result in list corruption.

Change-Id: Iefe0594a62563d800e85f8f6ebd747ab46c19fcf
CRs-Fixed: 2901576

components/blacklist_mgr/core/src/wlan_blm_core.c

@@ -917,6 +917,7 @@ void blm_update_reject_ap_list_to_fw(struct wlan_objmgr_psoc *psoc)
 	struct wlan_objmgr_pdev *pdev;
 	struct blm_pdev_priv_obj *blm_ctx;
 	struct blm_psoc_priv_obj *blm_psoc_obj;
+	QDF_STATUS status;
 
 	blm_psoc_obj = blm_get_psoc_obj(psoc);
 	if (!blm_psoc_obj) {
@@ -937,8 +938,15 @@ void blm_update_reject_ap_list_to_fw(struct wlan_objmgr_psoc *psoc)
 		goto end;
 	}
 
+	status = qdf_mutex_acquire(&blm_ctx->reject_ap_list_lock);
+	if (QDF_IS_STATUS_ERROR(status)) {
+		blm_err("failed to acquire reject_ap_list_lock");
+		goto end;
+	}
+
 	cfg = &blm_psoc_obj->blm_cfg;
 	blm_send_reject_ap_list_to_fw(pdev, &blm_ctx->reject_ap_list, cfg);
+	qdf_mutex_release(&blm_ctx->reject_ap_list_lock);
 
 end:
 	wlan_objmgr_pdev_release_ref(pdev, WLAN_MLME_CM_ID);