1 files changed, 26 insertions, 16 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 497e29a700ca..3ce98e8d7bce 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -225,16 +225,21 @@ static int serial_open (struct tty_struct *tty, struct file * filp)
                         goto bailout_mutex_unlock;
                 }
 
+                retval = usb_autopm_get_interface(serial->interface);
+                if (retval)
+                        goto bailout_module_put;
                 /* only call the device specific open if this 
                  * is the first time the port is opened */
                 retval = serial->type->open(port, filp);
                 if (retval)
-                        goto bailout_module_put;
+                        goto bailout_interface_put;
         }
 
         mutex_unlock(&port->mutex);
         return 0;
 
+bailout_interface_put:
+        usb_autopm_put_interface(serial->interface);
 bailout_module_put:
         module_put(serial->type->driver.owner);
 bailout_mutex_unlock:
@@ -264,17 +269,21 @@ static void serial_close(struct tty_struct *tty, struct file * filp)
         }
 
         --port->open_count;
-        if (port->open_count == 0) {
+        if (port->open_count == 0)
                 /* only call the device specific close if this 
                  * port is being closed by the last owner */
                 port->serial->type->close(port, filp);
 
+        if (port->open_count == (port->console? 1 : 0)) {
                 if (port->tty) {
                         if (port->tty->driver_data)
                                 port->tty->driver_data = NULL;
                         port->tty = NULL;
                 }
+        }
 
+        if (port->open_count == 0) {
+                usb_autopm_put_interface(port->serial->interface);
                 module_put(port->serial->type->driver.owner);
         }
 
@@ -625,6 +634,7 @@ static struct usb_serial * create_serial (struct usb_device *dev,
         serial->type = driver;
         serial->interface = interface;
         kref_init(&serial->kref);
+        mutex_init(&serial->disc_mutex);
 
         return serial;
 }
@@ -1080,20 +1090,22 @@ void usb_serial_disconnect(struct usb_interface *interface)
         usb_serial_console_disconnect(serial);
         dbg ("%s", __FUNCTION__);
 
+        mutex_lock(&serial->disc_mutex);
         usb_set_intfdata (interface, NULL);
-        if (serial) {
-                for (i = 0; i < serial->num_ports; ++i) {
-                        port = serial->port[i];
-                        if (port) {
-                                if (port->tty)
-                                        tty_hangup(port->tty);
-                                kill_traffic(port);
-                        }
+        /* must set a flag, to signal subdrivers */
+        serial->disconnected = 1;
+        for (i = 0; i < serial->num_ports; ++i) {
+                port = serial->port[i];
+                if (port) {
+                        if (port->tty)
+                                tty_hangup(port->tty);
+                        kill_traffic(port);
                 }
-                /* let the last holder of this object 
-                 * cause it to be cleaned up */
-                usb_serial_put(serial);
         }
+        /* let the last holder of this object
+         * cause it to be cleaned up */
+        mutex_unlock(&serial->disc_mutex);
+        usb_serial_put(serial);
         dev_info(dev, "device disconnected\n");
 }
 
@@ -1103,9 +1115,6 @@ int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
         struct usb_serial_port *port;
         int i, r = 0;
 
-        if (!serial) /* device has been disconnected */
-                return 0;
-
         for (i = 0; i < serial->num_ports; ++i) {
                 port = serial->port[i];
                 if (port)
@@ -1253,6 +1262,7 @@ static void fixup_generic(struct usb_serial_driver *device)
         set_to_generic_if_null(device, read_bulk_callback);
         set_to_generic_if_null(device, write_bulk_callback);
         set_to_generic_if_null(device, shutdown);
+        set_to_generic_if_null(device, resume);
 }
 
 int usb_serial_register(struct usb_serial_driver *driver) /* must be called with BKL held */