From b89db55a7d8cdf082301fc5d049d406e547e613a Mon Sep 17 00:00:00 2001
From: Jacob Dahl <dahl.jakejacob@gmail.com>
Date: Mon, 30 Sep 2024 10:51:05 -0800
Subject: [PATCH] set file descriptor to -1 after close()

---
 src/drivers/cdcacm_autostart/cdcacm_autostart.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/drivers/cdcacm_autostart/cdcacm_autostart.cpp b/src/drivers/cdcacm_autostart/cdcacm_autostart.cpp
index 3c963e798820..d86788ff7fa6 100644
--- a/src/drivers/cdcacm_autostart/cdcacm_autostart.cpp
+++ b/src/drivers/cdcacm_autostart/cdcacm_autostart.cpp
@@ -76,6 +76,7 @@ CdcAcmAutostart::~CdcAcmAutostart()
 
 	if (_ttyacm_fd >= 0) {
 		px4_close(_ttyacm_fd);
+		_ttyacm_fd = -1;
 	}
 
 	ScheduleClear();
@@ -344,6 +345,7 @@ void CdcAcmAutostart::state_disconnecting()
 
 	if (_ttyacm_fd > 0) {
 		px4_close(_ttyacm_fd);
+		_ttyacm_fd = -1;
 	}
 
 	// Disconnect serial