From 061c9bf4fe7879a030e6b89c895f5eb433c6923e Mon Sep 17 00:00:00 2001
From: Jan Okle <jan@leitwert.ch>
Date: Sun, 1 Apr 2018 11:39:15 -0400
Subject: [PATCH] [PX4: WIP] Fix transmission status handling in the serial
 interrupt

---
 arch/arm/src/kinetis/kinetis_serial.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/src/kinetis/kinetis_serial.c b/arch/arm/src/kinetis/kinetis_serial.c
index 23d327ec09a..771906c785b 100644
--- a/arch/arm/src/kinetis/kinetis_serial.c
+++ b/arch/arm/src/kinetis/kinetis_serial.c
@@ -950,7 +950,7 @@ static int up_interrupts(int irq, void *context, FAR void *arg)
        * the TX data register.
        */
 
-      if ((s1 & UART_S1_TDRE) != 0)
+      if ((s1 & UART_S1_TDRE) != 0 && (priv->ie & UART_C2_TIE) != 0)
 #endif
         {
           /* Process outgoing bytes */