From f9ac7286c1223889ea23a53d58dcad4cb6fc1cbb Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Fri, 2 Feb 2024 15:41:29 +0000
Subject: [PATCH] serial: sc16is7xx: Don't spin if no data received

There are multiple causes of interrupts, errors being one, and only the
receipt of data warrants continued polling.

See: https://github.com/raspberrypi/linux/issues/2676

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
 drivers/tty/serial/sc16is7xx.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -821,6 +821,8 @@ static bool sc16is7xx_port_irq(struct sc
 
 		if (rxlen)
 			sc16is7xx_handle_rx(port, rxlen, iir);
+		else
+			rc = false;
 		break;
 		/* CTSRTS interrupt comes only when CTS goes inactive */
 	case SC16IS7XX_IIR_CTSRTS_SRC:
