linux-kernel - [PATCH 5.10 009/530] USB: serial: usb_wwan: fix TIOCSSERIAL jiffies conversions

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Message-Id: <20210512144819.994345332@linuxfoundation.org>
Date:   Wed, 12 May 2021 16:41:59 +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 5.10 009/530] USB: serial: usb_wwan: fix TIOCSSERIAL jiffies conversions

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

commit 3d732690d2267f4d0e19077b178dffbedafdf0c9 upstream.

The port close_delay and closing_wait parameters set by TIOCSSERIAL are
specified in jiffies and not milliseconds.

Add the missing conversions so that the TIOCSSERIAL works as expected
also when HZ is not 1000.

Fixes: 02303f73373a ("usb-wwan: implement TIOCGSERIAL and TIOCSSERIAL to avoid blocking close(2)")
Cc: stable@...r.kernel.org      # 2.6.38
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/serial/usb_wwan.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -140,10 +140,10 @@ int usb_wwan_get_serial_info(struct tty_
 	ss->line            = port->minor;
 	ss->port            = port->port_number;
 	ss->baud_base       = tty_get_baud_rate(port->port.tty);
-	ss->close_delay	    = port->port.close_delay / 10;
+	ss->close_delay	    = jiffies_to_msecs(port->port.close_delay) / 10;
 	ss->closing_wait    = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 				 ASYNC_CLOSING_WAIT_NONE :
-				 port->port.closing_wait / 10;
+				 jiffies_to_msecs(port->port.closing_wait) / 10;
 	return 0;
 }
 EXPORT_SYMBOL(usb_wwan_get_serial_info);
@@ -155,9 +155,10 @@ int usb_wwan_set_serial_info(struct tty_
 	unsigned int closing_wait, close_delay;
 	int retval = 0;
 
-	close_delay = ss->close_delay * 10;
+	close_delay = msecs_to_jiffies(ss->close_delay * 10);
 	closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
-			ASYNC_CLOSING_WAIT_NONE : ss->closing_wait * 10;
+			ASYNC_CLOSING_WAIT_NONE :
+			msecs_to_jiffies(ss->closing_wait * 10);
 
 	mutex_lock(&port->port.mutex);