From 6e70b73ca5240c0059a1fbf8ccd4276d6cf71956 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Wed, 7 Apr 2021 12:23:28 +0200
Subject: [PATCH] tty: moxa: fix TIOCSSERIAL jiffies conversions
Git-commit: 6e70b73ca5240c0059a1fbf8ccd4276d6cf71956
Patch-mainline: v5.13-rc1
References: git-fixes

The port close_delay parameter set by TIOCSSERIAL is specified in
jiffies, while the value returned by TIOCGSERIAL is specified in
centiseconds.

Add the missing conversions so that TIOCGSERIAL works as expected also
when HZ is not 100.

Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210407102334.32361-11-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/tty/moxa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c
index 32eb6b5e510f..5b7bc7af8b1e 100644
--- a/drivers/tty/moxa.c
+++ b/drivers/tty/moxa.c
@@ -2038,7 +2038,7 @@ static int moxa_get_serial_info(struct tty_struct *tty,
 	ss->line = info->port.tty->index,
 	ss->flags = info->port.flags,
 	ss->baud_base = 921600,
-	ss->close_delay = info->port.close_delay;
+	ss->close_delay = jiffies_to_msecs(info->port.close_delay) / 10;
 	mutex_unlock(&info->port.mutex);
 	return 0;
 }
@@ -2067,7 +2067,7 @@ static int moxa_set_serial_info(struct tty_struct *tty,
 			return -EPERM;
 		}
 	}
-	info->port.close_delay = ss->close_delay * HZ / 100;
+	info->port.close_delay = msecs_to_jiffies(ss->close_delay * 10);
 
 	MoxaSetFifo(info, ss->type == PORT_16550A);
 
-- 
2.26.2