USB: usb-serial: replace shutdown with disconnect, release

This patch (as1254) splits up the shutdown method of usb_serial_driver
into a disconnect and a release method.

The problem is that the usb-serial core was calling shutdown during
disconnect handling, but drivers didn't expect it to be called until
after all the open file references had been closed.  The result was an
oops when the close method tried to use memory that had been
deallocated by shutdown.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 22 insertions, 17 deletions

diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
index fa817c66b3e8..0f44bb8e8d4f 100644
--- a/drivers/usb/serial/kl5kusb105.c
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -73,7 +73,8 @@ static int debug;
  * Function prototypes
  */
 static int  klsi_105_startup(struct usb_serial *serial);
-static void klsi_105_shutdown(struct usb_serial *serial);
+static void klsi_105_disconnect(struct usb_serial *serial);
+static void klsi_105_release(struct usb_serial *serial);
 static int  klsi_105_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp);
 static void klsi_105_close(struct usb_serial_port *port);
@@ -131,7 +132,8 @@ static struct usb_serial_driver kl5kusb105d_device = {
         .tiocmget =          klsi_105_tiocmget,
         .tiocmset =          klsi_105_tiocmset,
         .attach =            klsi_105_startup,
-        .shutdown =          klsi_105_shutdown,
+        .disconnect =        klsi_105_disconnect,
+        .release =           klsi_105_release,
         .throttle =          klsi_105_throttle,
         .unthrottle =        klsi_105_unthrottle,
 };
@@ -315,7 +317,7 @@ err_cleanup:
 } /* klsi_105_startup */
 
 
-static void klsi_105_shutdown(struct usb_serial *serial)
+static void klsi_105_disconnect(struct usb_serial *serial)
 {
         int i;
 
@@ -325,33 +327,36 @@ static void klsi_105_shutdown(struct usb_serial *serial)
         for (i = 0; i < serial->num_ports; ++i) {
                 struct klsi_105_private *priv =
                                 usb_get_serial_port_data(serial->port[i]);
-                unsigned long flags;
 
                 if (priv) {
                         /* kill our write urb pool */
                         int j;
                         struct urb **write_urbs = priv->write_urb_pool;
-                        spin_lock_irqsave(&priv->lock, flags);
 
                         for (j = 0; j < NUM_URBS; j++) {
                                 if (write_urbs[j]) {
-                                        /* FIXME - uncomment the following
-                                         * usb_kill_urb call when the host
-                                         * controllers get fixed to set
-                                         * urb->dev = NULL after the urb is
-                                         * finished.  Otherwise this call
-                                         * oopses. */
-                                        /* usb_kill_urb(write_urbs[j]); */
-                                        kfree(write_urbs[j]->transfer_buffer);
+                                        usb_kill_urb(write_urbs[j]);
                                         usb_free_urb(write_urbs[j]);
                                 }
                         }
-                        spin_unlock_irqrestore(&priv->lock, flags);
-                        kfree(priv);
-                        usb_set_serial_port_data(serial->port[i], NULL);
                 }
         }
-} /* klsi_105_shutdown */
+} /* klsi_105_disconnect */
+
+
+static void klsi_105_release(struct usb_serial *serial)
+{
+        int i;
+
+        dbg("%s", __func__);
+
+        for (i = 0; i < serial->num_ports; ++i) {
+                struct klsi_105_private *priv =
+                                usb_get_serial_port_data(serial->port[i]);
+
+                kfree(priv);
+        }
+} /* klsi_105_release */
 
 static int  klsi_105_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp)