linux-kernel - [PATCH 5.10 012/530] staging: fwserial: fix TIOCSSERIAL jiffies conversions

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Date:   Wed, 12 May 2021 16:42:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan@...nel.org>
Subject: [PATCH 5.10 012/530] staging: fwserial: fix TIOCSSERIAL jiffies conversions

From: Johan Hovold <johan@...nel.org>

commit 7a3791afdbd5a951b09a7689bba856bd9f6c6a9f upstream.

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.

Fixes: 7355ba3445f2 ("staging: fwserial: Add TTY-over-Firewire serial driver")
Cc: stable@...r.kernel.org      # 3.8
Signed-off-by: Johan Hovold <johan@...nel.org>
Link: https://lore.kernel.org/r/20210407102334.32361-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/fwserial/fwserial.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/staging/fwserial/fwserial.c
+++ b/drivers/staging/fwserial/fwserial.c
@@ -1223,7 +1223,7 @@ static int get_serial_info(struct tty_st
 	ss->flags = port->port.flags;
 	ss->xmit_fifo_size = FWTTY_PORT_TXFIFO_LEN;
 	ss->baud_base = 400000000;
-	ss->close_delay = port->port.close_delay;
+	ss->close_delay = jiffies_to_msecs(port->port.close_delay) / 10;
 	mutex_unlock(&port->port.mutex);
 	return 0;
 }
@@ -1245,7 +1245,7 @@ static int set_serial_info(struct tty_st
 			return -EPERM;
 		}
 	}
-	port->port.close_delay = ss->close_delay * HZ / 100;
+	port->port.close_delay = msecs_to_jiffies(ss->close_delay * 10);
 	mutex_unlock(&port->port.mutex);
 
 	return 0;