Bluetooth: controller: split: Fix aborting of connection req PDU

Fix the initiator so that connection request PDU is not abort
mid-air by preemption by the overalapping first connection
event.

If the connection establishment is in progress, then the
first connection event trying to abort the initiator will
wait the connection request to be transmited completely.

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

Author: cvinayak

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_scan.c

@@ -8,7 +8,9 @@
 #include <toolchain.h>
 #include <bluetooth/hci.h>
 #include <sys/byteorder.h>
+#include <soc.h>
 
+#include "hal/cpu.h"
 #include "hal/ccm.h"
 #include "hal/radio.h"
 #include "hal/ticker.h"
@@ -35,7 +37,6 @@
 #define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HCI_DRIVER)
 #define LOG_MODULE_NAME bt_ctlr_lll_scan
 #include "common/log.h"
-#include <soc.h>
 #include "hal/debug.h"
 
 static int init_reset(void);
@@ -313,8 +314,14 @@ static void abort_cb(struct lll_prepare_param *prepare_param, void *param)
 		 * After event has been cleanly aborted, clean up resources
 		 * and dispatch event done.
 		 */
-		radio_isr_set(isr_abort, param);
-		radio_disable();
+		if (IS_ENABLED(CONFIG_BT_CTLR_LOW_LAT) && lll_is_stop(param)) {
+			while (!radio_has_disabled()) {
+				cpu_sleep();
+			}
+		} else {
+			radio_isr_set(isr_abort, param);
+			radio_disable();
+		}
 		return;
 	}