From 2fd618a295b0b628ef51dfc291e3cd513f5ceaec Mon Sep 17 00:00:00 2001
From: Xavier Arteaga <xavier@softwareradiosystems.com>
Date: Tue, 16 Feb 2021 12:06:55 +0100
Subject: [PATCH] Avoid FFTW re-planning if no DFT change is required

---
 lib/src/phy/dft/dft_fftw.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/src/phy/dft/dft_fftw.c b/lib/src/phy/dft/dft_fftw.c
index 14659d306..df703a918 100644
--- a/lib/src/phy/dft/dft_fftw.c
+++ b/lib/src/phy/dft/dft_fftw.c
@@ -138,6 +138,11 @@ int srslte_dft_replan_c(srslte_dft_plan_t* plan, const int new_dft_points)
 {
   int sign = (plan->dir == SRSLTE_DFT_FORWARD) ? FFTW_FORWARD : FFTW_BACKWARD;
 
+  // No change in size, skip re-planning
+  if (plan->size == new_dft_points) {
+    return 0;
+  }
+
   pthread_mutex_lock(&fft_mutex);
   if (plan->p) {
     fftwf_destroy_plan(plan->p);