From d0a137799e066f9b10fb06719d1a08ad130d594a Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Wed, 26 Sep 2018 08:21:48 +0000
Subject: Fixed regression in UARTv2 serial driver.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@12291 110e8d01-0319-4d1e-a829-52ad28d1bb01
---
 os/hal/ports/STM32/LLD/USARTv2/hal_serial_lld.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/os/hal/ports/STM32/LLD/USARTv2/hal_serial_lld.c b/os/hal/ports/STM32/LLD/USARTv2/hal_serial_lld.c
index 6c2b855af..a89c02b24 100644
--- a/os/hal/ports/STM32/LLD/USARTv2/hal_serial_lld.c
+++ b/os/hal/ports/STM32/LLD/USARTv2/hal_serial_lld.c
@@ -366,6 +366,7 @@ static void serve_interrupt(SerialDriver *sdp) {
       if (b < MSG_OK) {
         chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
         u->CR1 = cr1 & ~USART_CR1_TXEIE;
+        osalSysUnlockFromISR();
         break;
       }
       u->TDR = b;
-- 
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