bluetooth: controller: Perform synchronized LLL reset via mayfly

Use semaphore to synchronize lll_reset completion with HCI thread for
returning (command complete) only when all is done.

Signed-off-by: Morten Priess <[email protected]>

Author: mtpr-ot

subsys/bluetooth/controller/ll_sw/ull.c

@@ -406,14 +406,20 @@ void ll_reset(void)
 	/* Reset LLL via mayfly */
 	{
 		u32_t retval;
+		struct k_sem sem;
 		static memq_link_t link;
 		static struct mayfly mfy = {0, 0, &link, NULL,
 					    perform_lll_reset};
 
-		mfy.param = NULL;
+		k_sem_init(&sem, 0, 1);
+		mfy.param = &sem;
 		retval = mayfly_enqueue(TICKER_USER_ID_THREAD,
 					TICKER_USER_ID_LLL, 0, &mfy);
 		LL_ASSERT(!retval);
+		/* LLL reset must complete before returning - wait for
+		 * reset completion in LLL mayfly thread
+		 */
+		k_sem_take(&sem, K_FOREVER);
 	}
 
 	/* Common to init and reset */
@@ -1202,6 +1208,8 @@ static void perform_lll_reset(void *param)
 	err = lll_conn_reset();
 	LL_ASSERT(!err);
 #endif /* CONFIG_BT_CONN */
+
+	k_sem_give(param);
 }
 
 static inline void *mark_set(void **m, void *param)