From 1f4b9adbf569fe851c314bc4eae2dc0d9f3b5a4f Mon Sep 17 00:00:00 2001
From: Tillmann Karras <tilkax@gmail.com>
Date: Sun, 2 Aug 2020 23:20:33 +0100
Subject: [PATCH] ISO/USB: fix potential race condition

---
 Source/Core/Core/IOS/USB/Host.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Source/Core/Core/IOS/USB/Host.cpp b/Source/Core/Core/IOS/USB/Host.cpp
index f6ab6ed661..460f5a859f 100644
--- a/Source/Core/Core/IOS/USB/Host.cpp
+++ b/Source/Core/Core/IOS/USB/Host.cpp
@@ -179,9 +179,8 @@ void USBHost::StartThreads()
   if (Core::WantsDeterminism())
     return;
 
-  if (!m_scan_thread_running.IsSet())
+  if (m_scan_thread_running.TestAndSet())
   {
-    m_scan_thread_running.Set();
     m_scan_thread = std::thread([this] {
       Common::SetCurrentThreadName("USB Scan Thread");
       while (m_scan_thread_running.IsSet())