Bluetooth: Controller: Fix missing connection handle invalidate

Fix missing connection handle invalidate on Controller
power up.

The connection context are zero-initialized on startup and
calls to `ll_connected_get()` would incorrectly return a
valid connection context pointer for connection handle 0.

Signed-off-by: Vinayak Kariappa Chettimada <[email protected]>

Author: cvinayak

subsys/bluetooth/controller/ll_sw/ull_conn.c

@@ -781,6 +781,7 @@ int ull_conn_reset(void)
 	(void)ull_central_reset();
 #endif /* CONFIG_BT_CENTRAL */
 
+	/* Stop any active ticker related to connection roles */
 	for (handle = 0U; handle < CONFIG_BT_MAX_CONN; handle++) {
 		disable(handle);
 	}
@@ -1667,6 +1668,11 @@ static int init_reset(void)
 	mem_init(conn_pool, sizeof(struct ll_conn),
 		 sizeof(conn_pool) / sizeof(struct ll_conn), &conn_free);
 
+	/* Invalidate connection handles, refer to ll_connected_get() */
+	for (handle = 0U; handle < CONFIG_BT_MAX_CONN; handle++) {
+		conn->lll.handle = LLL_HANDLE_INVALID;
+	}
+
 	/* Initialize tx pool. */
 	mem_init(mem_conn_tx.pool, CONN_TX_BUF_SIZE, CONN_DATA_BUFFERS,
 		 &mem_conn_tx.free);
@@ -1835,8 +1841,6 @@ static inline void disable(uint16_t handle)
 	err = ull_ticker_stop_with_mark(TICKER_ID_CONN_BASE + handle,
 					conn, &conn->lll);
 	LL_ASSERT_INFO2(err == 0 || err == -EALREADY, handle, err);
-
-	conn->lll.handle = LLL_HANDLE_INVALID;
 	conn->lll.link_tx_free = NULL;
 }