linux-kernel - [PATCH] snd: soc: cx20442 codec: set tty->receiver_room in v253

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Date:	Thu, 16 Jun 2016 22:04:35 +0200
From:	Janusz Krzysztofik <jmkrzyszt@...il.com>
To:	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>
Cc:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Janusz Krzysztofik <jmkrzyszt@...il.com>
Subject: [PATCH] snd: soc: cx20442 codec: set tty->receiver_room in v253_open

Commit 79901317ce80 ("n_tty: Don't flush buffer when closing ldisc"),
introduced in v3.10, revealed a bug in the cx20442 codec driver
which has never been setting tty->receive_room on line discipline
open as it should from the beginning. Fix it.

Created and tested on Amstrad Delta against Linux-4.7-rc3

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
---
 sound/soc/codecs/cx20442.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/cx20442.c b/sound/soc/codecs/cx20442.c
index d6f4abb..fb3885f 100644
--- a/sound/soc/codecs/cx20442.c
+++ b/sound/soc/codecs/cx20442.c
@@ -226,6 +226,7 @@ static int v253_open(struct tty_struct *tty)
 	if (!tty->disc_data)
 		return -ENODEV;
 
+	tty->receive_room = 16;
 	if (tty->ops->write(tty, v253_init, len) != len) {
 		ret = -EIO;
 		goto err;
-- 
2.7.3