Bluetooth: Controller: Fix to ignore aux ptr in scannable advertising

Fix to ignore aux pointer struct in scanning advertising, to
avoid ULL scheduling from setting up ticker to receive chain
PDUs while LLL is receiving scan response PDU.

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

Author: cvinayak

subsys/bluetooth/controller/ll_sw/ull_scan_aux.c

@@ -340,7 +340,11 @@ void ull_scan_aux_setup(memq_link_t *link, struct node_rx_hdr *rx)
 		ull_sync_chm_update(rx->handle, ptr, acad_len);
 	}
 
-	if (!aux_ptr || !aux_ptr->offs ||
+	/* Do not ULL scheduling auxiliary PDU reception if not aux pointer
+	 * or aux pointer is zero or scannable advertising has erroneous aux
+	 * pointer being present or PHY in the aux pointer is invalid.
+	 */
+	if (!aux_ptr || !aux_ptr->offs || is_scan_req ||
 	    (aux_ptr->phy > EXT_ADV_AUX_PHY_LE_CODED)) {
 		if (is_scan_req) {
 			LL_ASSERT(aux && aux->rx_last);