From b4c43cf880cccccd90ac6865d000892ff671e399 Mon Sep 17 00:00:00 2001
From: Andrzej Kaczmarek <andrzej.kaczmarek@codecoup.pl>
Date: Wed, 15 Jun 2022 15:08:08 +0200
Subject: [PATCH] nimble/ll/css: Disallow slot change if css disabled

---
 nimble/controller/src/ble_ll_hci_vs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/nimble/controller/src/ble_ll_hci_vs.c b/nimble/controller/src/ble_ll_hci_vs.c
index 7504f10d2..5aee70f8a 100644
--- a/nimble/controller/src/ble_ll_hci_vs.c
+++ b/nimble/controller/src/ble_ll_hci_vs.c
@@ -233,6 +233,10 @@ ble_ll_hci_vs_css_set_conn_slot(const uint8_t *cmdbuf, uint8_t cmdlen,
         return BLE_ERR_INV_HCI_CMD_PARMS;
     }
 
+    if (!ble_ll_sched_css_is_enabled()) {
+        return BLE_ERR_CMD_DISALLOWED;
+    }
+
     slot_idx = le16toh(cmd->slot_idx);
     if ((slot_idx >= ble_ll_sched_css_get_period_slots()) &&
         (slot_idx != BLE_LL_CONN_CSS_NO_SLOT)) {