From 202b868d1d3a17fe25556460c8637bd416f5225b Mon Sep 17 00:00:00 2001
From: Freddie Akeroyd <freddie.akeroyd@stfc.ac.uk>
Date: Wed, 23 Sep 2026 18:20:32 +0100
Subject: [PATCH] Fix timeout propagation

---
 asyn/drvAsynSerial/drvAsynSerialPortWin32.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/asyn/drvAsynSerial/drvAsynSerialPortWin32.c b/asyn/drvAsynSerial/drvAsynSerialPortWin32.c
index 0562cf5..722ef64 100644
--- a/asyn/drvAsynSerial/drvAsynSerialPortWin32.c
+++ b/asyn/drvAsynSerial/drvAsynSerialPortWin32.c
@@ -183,6 +183,7 @@ static int waitForBytes(ttyController_t *tty, asynUser* pasynUser, double timeou
 		{
 			epicsTimeGetCurrent(&ts);
 			timeout -= epicsTimeDiffInSeconds(&ts, &ts_start);
+			ts_start = ts;
 		}
 		else
 		{