From a8cb3ede82fea8a0afc7d8ba8f4977a13a410441 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Wed, 28 Jul 2021 20:52:19 +0200
Subject: [PATCH] Revert "cx20442: tty_ldisc_ops::write_wakeup is optional"

This reverts commit 0e9ffdb236b8d273a086e86887192a62dd8f144a.

It will be coming in through the ASoC tree instead.

Cc: Liam Girdwood <lgirdwood@gmail.com>
Reported-by: Mark Brown <broonie@kernel.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 sound/soc/codecs/cx20442.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/soc/codecs/cx20442.c b/sound/soc/codecs/cx20442.c
index 13258f3ca9aae..20981773f59f5 100644
--- a/sound/soc/codecs/cx20442.c
+++ b/sound/soc/codecs/cx20442.c
@@ -279,6 +279,11 @@ static void v253_receive(struct tty_struct *tty, const unsigned char *cp,
 	}
 }
 
+/* Line discipline .write_wakeup() */
+static void v253_wakeup(struct tty_struct *tty)
+{
+}
+
 struct tty_ldisc_ops v253_ops = {
 	.name = "cx20442",
 	.owner = THIS_MODULE,
@@ -286,6 +291,7 @@ struct tty_ldisc_ops v253_ops = {
 	.close = v253_close,
 	.hangup = v253_hangup,
 	.receive_buf = v253_receive,
+	.write_wakeup = v253_wakeup,
 };
 EXPORT_SYMBOL_GPL(v253_ops);
 
-- 
2.30.2