From a9ccc3a5ec748d2dc296cadb376f54baa7272c3b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Revol?= <revol@free.fr>
Date: Fri, 29 Aug 2014 15:05:03 +0200
Subject: [PATCH] pc_serial: mask THRE again when we're out of data

---
 src/add-ons/kernel/drivers/ports/pc_serial/SerialDevice.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/add-ons/kernel/drivers/ports/pc_serial/SerialDevice.cpp b/src/add-ons/kernel/drivers/ports/pc_serial/SerialDevice.cpp
index e02917f1cb..7e482db3e5 100644
--- a/src/add-ons/kernel/drivers/ports/pc_serial/SerialDevice.cpp
+++ b/src/add-ons/kernel/drivers/ports/pc_serial/SerialDevice.cpp
@@ -434,6 +434,8 @@ SerialDevice::InterruptHandler()
 
 			if (readable == 0) {
 				release_sem_etc(fDoneWrite, 1, B_DO_NOT_RESCHEDULE);
+				// mask it until there's data again
+				fCachedIER &= ~IER_THRE;
 				break;
 			}