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From 15cbb4515b766b5efc48bc53b1f83c4211c671a4 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 6 Nov 2018 12:57:48 +0000
Subject: [PATCH 438/454] 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
@@ -701,6 +701,8 @@ 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);