From c371de14b9a23aadb57accab0ca2e5dd28de7f16 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 21 Mar 2013 12:36:53 +0100 Subject: [PATCH] USB: serial: wake up MSR-wait queue on disconnect Make sure processes waiting for modem-status changes are woken up at disconnect. This is needed for custom subdriver TIOCMIWAIT-implementations which do not yet handle hangup. Even though processes on the tty-port wait queue are woken up at hangup the wake-up call in usb-serial disconnect is still needed if a woken-up process may go back to sleep (e.g. due to an incomplete TIOCMIWAIT-implementation). If a disconnect occurs after a hangup, any process waiting for changes will not be woken up a second time by the tty-layer as the port will then have been disassociated from the tty. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/usb-serial.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index ada400d..4568816 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -1093,6 +1093,7 @@ static void usb_serial_disconnect(struct usb_interface *interface) tty_kref_put(tty); } usb_serial_port_poison_urbs(port); + wake_up_interruptible(&port->port.delta_msr_wait); cancel_work_sync(&port->work); if (device_is_registered(&port->dev)) device_del(&port->dev); -- 2.7.4