1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 92200f05b531..7a1cc1b04979 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -531,7 +531,17 @@ exit:
         return -EINVAL;
 }
 
-void usb_serial_port_softint(void *private)
+/*
+ * We would be calling tty_wakeup here, but unfortunately some line
+ * disciplines have an annoying habit of calling tty->write from
+ * the write wakeup callback (e.g. n_hdlc.c).
+ */
+void usb_serial_port_softint(struct usb_serial_port *port)
+{
+        schedule_work(&port->work);
+}
+
+static void usb_serial_port_work(void *private)
 {
         struct usb_serial_port *port = private;
         struct tty_struct *tty;
@@ -794,7 +804,7 @@ int usb_serial_probe(struct usb_interface *interface,
                 port->serial = serial;
                 spin_lock_init(&port->lock);
                 mutex_init(&port->mutex);
-                INIT_WORK(&port->work, usb_serial_port_softint, port);
+                INIT_WORK(&port->work, usb_serial_port_work, port);
                 serial->port[i] = port;
         }