Bluetooth: controller: minor cleanup and a fix-up re. LLCP

Only perform retention if not already done.
Ensure 'sched' is performed on phy ntf even if dle is not.

Signed-off-by: Erik Brockhoff <erbr@oticon.com>

subsys/bluetooth/controller/ll_sw/ull_llcp.c

@@ -284,17 +284,21 @@ void llcp_rx_node_retain(struct proc_ctx *ctx)
 {
 	LL_ASSERT(ctx->node_ref.rx);
 
-	/* Mark RX node to NOT release */
-	ctx->node_ref.rx->hdr.type = NODE_RX_TYPE_RETAIN;
+	/* Only retain if not already retained */
+	if (ctx->node_ref.rx->hdr.type != NODE_RX_TYPE_RETAIN) {
+		/* Mark RX node to NOT release */
+		ctx->node_ref.rx->hdr.type = NODE_RX_TYPE_RETAIN;
 
-	/* store link element reference to use once this node is moved up */
-	ctx->node_ref.rx->hdr.link = ctx->node_ref.link;
+		/* store link element reference to use once this node is moved up */
+		ctx->node_ref.rx->hdr.link = ctx->node_ref.link;
+	}
 }
 
 void llcp_rx_node_release(struct proc_ctx *ctx)
 {
 	LL_ASSERT(ctx->node_ref.rx);
 
+	/* Only release if retained */
 	if (ctx->node_ref.rx->hdr.type == NODE_RX_TYPE_RETAIN) {
 		/* Mark RX node to release and release */
 		ctx->node_ref.rx->hdr.type = NODE_RX_TYPE_RELEASE;

subsys/bluetooth/controller/ll_sw/ull_llcp_phy.c

@@ -450,15 +450,9 @@ static void pu_ntf(struct ll_conn *conn, struct proc_ctx *ctx)
 	}
 
 	/* Enqueue notification towards LL */
-#if defined(CONFIG_BT_CTLR_DATA_LENGTH)
-	/* only 'put' as the 'sched' is handled when handling DLE ntf */
-	ll_rx_put(ntf->hdr.link, ntf);
-#else
 	ll_rx_put_sched(ntf->hdr.link, ntf);
-#endif /* CONFIG_BT_CTLR_DATA_LENGTH */
 
 	ctx->data.pu.ntf_pu = 0;
-	ctx->node_ref.rx = NULL;
 }
 
 #if defined(CONFIG_BT_CTLR_DATA_LENGTH)