The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 3d732690d2267f4d0e19077b178dffbedafdf0c9 Mon Sep 17 00:00:00 2001
From: Johan Hovold johan@kernel.org Date: Wed, 7 Apr 2021 12:39:16 +0200 Subject: [PATCH] USB: serial: usb_wwan: fix TIOCSSERIAL jiffies conversions
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@vger.kernel.org # 2.6.38 Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Johan Hovold johan@kernel.org
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c index 46d46a4f99c9..4e9c994a972a 100644 --- 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_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_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);