backend/usb: only force single thread on macOS

In a35e009 we forced all USB communication to happen in a single
thread because macOS otherwise fails with obscure errors (see commit
msg).

For simplicity we applied this to all platforms. At least on Windows,
users ar experiencing issues where the BitBox02 would timeout during
password entry. It is not clear why, but since this was the only
change related to USB communication, we revert it for all platforms
except macOS.

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## 4.36.1
+- Fix USB communication issue on Windows
+
 ## 4.36.0
 - Re-style header for a better space utilisation
 - Re-style sidebar navigation on mobile (portrait) to be full-screen for better space utilisation and a more modern look

backend/devices/usb/hid.go

@@ -30,14 +30,16 @@ import (
 var funcCalls chan func()
 
 func init() {
-	funcCalls = make(chan func())
-	go func() {
-		runtime.LockOSThread()
-		for {
-			f := <-funcCalls
-			f()
-		}
-	}()
+	if runtime.GOOS == "darwin" {
+		funcCalls = make(chan func())
+		go func() {
+			runtime.LockOSThread()
+			for {
+				f := <-funcCalls
+				f()
+			}
+		}()
+	}
 }
 
 type funcCallResult[T any] struct {
@@ -128,29 +130,37 @@ func (s singleThreadedDevice) Close() error {
 
 // Open implements DeviceInfo.
 func (info hidDeviceInfo) Open() (io.ReadWriteCloser, error) {
-	ch := make(chan funcCallResult[hid.Device])
-	funcCalls <- func() {
-		device, err := info.DeviceInfo.Open()
-		ch <- funcCallResult[hid.Device]{device, err}
-	}
-	result := <-ch
-	if result.err != nil {
-		return nil, result.err
+	if runtime.GOOS == "darwin" {
+		ch := make(chan funcCallResult[hid.Device])
+		funcCalls <- func() {
+			device, err := info.DeviceInfo.Open()
+			ch <- funcCallResult[hid.Device]{device, err}
+		}
+		result := <-ch
+		if result.err != nil {
+			return nil, result.err
+		}
+		return singleThreadedDevice{device: result.value}, nil
 	}
-
-	return singleThreadedDevice{device: result.value}, nil
+	return info.DeviceInfo.Open()
 }
 
 // DeviceInfos returns a slice of all recognized devices.
 func DeviceInfos() []DeviceInfo {
 	deviceInfosFiltered := []DeviceInfo{}
 
+	var result funcCallResult[[]hid.DeviceInfo]
 	ch := make(chan funcCallResult[[]hid.DeviceInfo])
-	funcCalls <- func() {
+	if runtime.GOOS == "darwin" {
+		funcCalls <- func() {
+			di, err := hid.EnumerateHid(0, 0)
+			ch <- funcCallResult[[]hid.DeviceInfo]{di, err}
+		}
+		result = <-ch
+	} else {
 		di, err := hid.EnumerateHid(0, 0)
-		ch <- funcCallResult[[]hid.DeviceInfo]{di, err}
+		result = funcCallResult[[]hid.DeviceInfo]{di, err}
 	}
-	result := <-ch
 	// The library never actually returns an error in this functions.
 	if result.err != nil {
 		logging.Get().WithError(result.err).Error("EnumerateHid() returned an error")

backend/update.go

@@ -27,7 +27,7 @@ const updateFileURL = "https://shiftcrypto.ch/updates/desktop.json"
 
 var (
 	// Version of the backend as displayed to the user.
-	Version = semver.NewSemVer(4, 36, 0)
+	Version = semver.NewSemVer(4, 36, 1)
 )
 
 // UpdateFile is retrieved from the server.

frontends/qt/setup.nsi

@@ -22,7 +22,7 @@ SetCompressor /SOLID lzma
 
 # General Symbol Definitions
 !define REGKEY "SOFTWARE\$(^Name)"
-!define VERSION 4.36.0.0
+!define VERSION 4.36.1.0
 !define COMPANY "Shift Crypto AG"
 !define URL https://github.com/digitalbitbox/bitbox-wallet-app/releases/
 !define BINDIR "build\windows"