From ce6a8da1883bbc3e8c62284b365c2bab3d7fc555 Mon Sep 17 00:00:00 2001
From: Tanguy Pruvot <tanguy.pruvot@gmail.com>
Date: Sun, 18 Dec 2016 03:23:11 +0100
Subject: [PATCH] cuda: prevent ptxas crash with -n

---
 cuda.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cuda.cpp b/cuda.cpp
index 5afaeec..921e578 100644
--- a/cuda.cpp
+++ b/cuda.cpp
@@ -122,7 +122,9 @@ void cuda_print_devices()
 
 void cuda_shutdown()
 {
-	cudaDeviceSynchronize();
+	// require gpu init first
+	if (thr_info != NULL)
+		cudaDeviceSynchronize();
 	cudaDeviceReset();
 }