From 636d7fdb72c0c6674699c8520f7c6132d86b03bf Mon Sep 17 00:00:00 2001
From: Pau Espin Pedrol <pespin@sysmocom.de>
Date: Wed, 31 May 2023 20:28:49 +0200
Subject: bts: use RFN directly to calculate fn416

RFN_MODULUS (42432) used to calculate is a multiple of 416:
416 * 102 = 42432

Hence, (X % 42432) % 416 == X % 416.
So, there's no need to derive the full FN.

Change-Id: If7a6a15c373a068bcc757d27937dd6eeac2e0bae
---
 src/bts.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/bts.cpp b/src/bts.cpp
index 6cac93f5..640405f5 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -1058,7 +1058,7 @@ static uint32_t ptcch_slot_map[PTCCH_TAI_NUM] = {
 
 int bts_rcv_ptcch_rach(struct gprs_rlcmac_bts *bts, const struct rach_ind_params *rip)
 {
-	uint32_t fn416 = bts_rfn_to_fn(bts, rip->rfn) % 416;
+	uint16_t fn416 = rip->rfn % 416;
 	struct gprs_rlcmac_pdch *pdch;
 	uint8_t ss;
 
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