From 99a05dbc889252033c41a5800a1e10bac823fa4c Mon Sep 17 00:00:00 2001
From: Siyuan <siyuan@buildjet.com>
Date: Fri, 26 Sep 2025 13:21:47 +0000
Subject: [PATCH] add lock to usb state

---
 usb.go | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/usb.go b/usb.go
index aa7d78f9..f476773b 100644
--- a/usb.go
+++ b/usb.go
@@ -1,6 +1,7 @@
 package kvm
 
 import (
+	"sync"
 	"time"
 
 	"github.com/jetkvm/kvm/internal/usbgadget"
@@ -77,7 +78,10 @@ func rpcGetKeysDownState() (state usbgadget.KeysDownState) {
 	return gadget.GetKeysDownState()
 }
 
-var usbState = "unknown"
+var (
+	usbState     = "unknown"
+	usbStateLock sync.Mutex
+)
 
 func rpcGetUSBState() (state string) {
 	return gadget.GetUsbState()
@@ -94,7 +98,11 @@ func triggerUSBStateUpdate() {
 }
 
 func checkUSBState() {
+	usbStateLock.Lock()
+	defer usbStateLock.Unlock()
+
 	newState := gadget.GetUsbState()
+
 	if newState == usbState {
 		return
 	}