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, 8 insertions, 4 deletions

diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index ed4aa0fa7ed8..44801d26a37a 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -194,8 +194,10 @@ static inline void usb_set_serial_data(struct usb_serial *serial, void *data)
  *      This will be called when the struct usb_serial structure is fully set
  *      set up.  Do any local initialization of the device, or any private
  *      memory structure allocation at this point in time.
- * @shutdown: pointer to the driver's shutdown function.  This will be
- *      called when the device is removed from the system.
+ * @disconnect: pointer to the driver's disconnect function.  This will be
+ *      called when the device is unplugged or unbound from the driver.
+ * @release: pointer to the driver's release function.  This will be called
+ *      when the usb_serial data structure is about to be destroyed.
  * @usb_driver: pointer to the struct usb_driver that controls this
  *      device.  This is necessary to allow dynamic ids to be added to
  *      the driver from sysfs.
@@ -226,7 +228,8 @@ struct usb_serial_driver {
         int (*attach)(struct usb_serial *serial);
         int (*calc_num_ports) (struct usb_serial *serial);
 
-        void (*shutdown)(struct usb_serial *serial);
+        void (*disconnect)(struct usb_serial *serial);
+        void (*release)(struct usb_serial *serial);
 
         int (*port_probe)(struct usb_serial_port *port);
         int (*port_remove)(struct usb_serial_port *port);
@@ -308,7 +311,8 @@ extern void usb_serial_generic_read_bulk_callback(struct urb *urb);
 extern void usb_serial_generic_write_bulk_callback(struct urb *urb);
 extern void usb_serial_generic_throttle(struct tty_struct *tty);
 extern void usb_serial_generic_unthrottle(struct tty_struct *tty);
-extern void usb_serial_generic_shutdown(struct usb_serial *serial);
+extern void usb_serial_generic_disconnect(struct usb_serial *serial);
+extern void usb_serial_generic_release(struct usb_serial *serial);
 extern int usb_serial_generic_register(int debug);
 extern void usb_serial_generic_deregister(void);
 extern void usb_serial_generic_resubmit_read_urb(struct usb_serial_port *port,