blob: e469b44880c1a595891c6554eb2fe4b436f7eea5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
From 58c600f728f2787e905eff2f678fa9cf09694004 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Fri, 2 Feb 2024 15:41:29 +0000
Subject: [PATCH 1274/1295] 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
@@ -762,6 +762,8 @@ 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:
|