From 8b0adfcc82de521548f3a95d44738ebbe47a5e3b Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@linux.intel.com>
Date: Mon, 13 Nov 2017 01:32:47 +0000
Subject: [PATCH] tty: allow signals to break out of a tty write to a tty that
 is flow controlled

---
 Kernel/tty.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Kernel/tty.c b/Kernel/tty.c
index 46e7aef1..24b9b6fe 100644
--- a/Kernel/tty.c
+++ b/Kernel/tty.c
@@ -509,6 +509,10 @@ uint8_t tty_putc_maywait(uint8_t minor, unsigned char c, uint8_t flag)
 	*/
 	if (!udata.u_ininterrupt) {
 		while ((t = tty_writeready(minor)) != TTY_READY_NOW) {
+			if (chksigs()) {
+				udata.u_error = EINTR;
+				return 1;
+			}
 			if (t == TTY_READY_LATER && flag) {
 				udata.u_error = EAGAIN;
 				return 1;
-- 
2.34.1