From: Sven Schnelle <svens@linux.ibm.com>
Date: Thu, 17 Nov 2022 16:52:40 +0000 (+0100)
Subject: s390/tty3270: ignore NUL characters
X-Git-Tag: io_uring-6.3-2023-03-03~22^2~161
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=970cf9a97a27d3f9a72a17aa6aedb47758478c33;p=linux-block.git

s390/tty3270: ignore NUL characters

With 'TERM=vt220' zsh is sending several NUL characters with
the prompt to the tty. Both xterm and the linux drm console
seem to ignore them. Ignore them in tty3270 as well.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---

diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index 9c816d1239eb..7ff116c38715 100644
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -1732,6 +1732,8 @@ static void tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
 		}
 
 		switch (buf[i_msg]) {
+		case 0x00:
+			break;
 		case 0x07:		/* '\a' -- Alarm */
 			tp->wcc |= TW_PLUSALARM;
 			break;