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From c625bcbb6a4c45e29c7c2c0dec24831025051032 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 6 Nov 2018 12:57:48 +0000
Subject: [PATCH] sc16is7xx: Don't spin if no data received
See: https://github.com/raspberrypi/linux/issues/2676
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
drivers/tty/serial/sc16is7xx.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -696,6 +696,8 @@ static bool sc16is7xx_port_irq(struct sc
rxlen = sc16is7xx_port_read(port, SC16IS7XX_RXLVL_REG);
if (rxlen)
sc16is7xx_handle_rx(port, rxlen, iir);
+ else
+ return false;
break;
case SC16IS7XX_IIR_THRI_SRC:
sc16is7xx_handle_tx(port);
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