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>

37 files changed, 297 insertions, 198 deletions

diff --git a/drivers/staging/uc2322/aten2011.c b/drivers/staging/uc2322/aten2011.c
index 9c62f787cc9c..39d0926d1a90 100644
--- a/drivers/staging/uc2322/aten2011.c
+++ b/drivers/staging/uc2322/aten2011.c
@@ -2336,7 +2336,7 @@ static int ATEN2011_startup(struct usb_serial *serial)
 	return 0;
 }
 
-static void ATEN2011_shutdown(struct usb_serial *serial)
+static void ATEN2011_release(struct usb_serial *serial)
 {
 	int i;
 	struct ATENINTL_port *ATEN2011_port;
@@ -2382,7 +2382,7 @@ static struct usb_serial_driver aten_serial_driver = {
 	.tiocmget =		ATEN2011_tiocmget,
 	.tiocmset =		ATEN2011_tiocmset,
 	.attach =		ATEN2011_startup,
-	.shutdown =		ATEN2011_shutdown,
+	.release =		ATEN2011_release,
 	.read_bulk_callback =	ATEN2011_bulk_in_callback,
 	.read_int_callback =	ATEN2011_interrupt_callback,
 };
diff --git a/drivers/usb/serial/aircable.c b/drivers/usb/serial/aircable.c
index 6d106e74265e..2cbfab3716e5 100644
--- a/drivers/usb/serial/aircable.c
+++ b/drivers/usb/serial/aircable.c
@@ -364,7 +364,7 @@ static int aircable_attach(struct usb_serial *serial)
 	return 0;
 }
 
-static void aircable_shutdown(struct usb_serial *serial)
+static void aircable_release(struct usb_serial *serial)
 {
 
 	struct usb_serial_port *port = serial->port[0];
@@ -375,7 +375,6 @@ static void aircable_shutdown(struct usb_serial *serial)
 	if (priv) {
 		serial_buf_free(priv->tx_buf);
 		serial_buf_free(priv->rx_buf);
-		usb_set_serial_port_data(port, NULL);
 		kfree(priv);
 	}
 }
@@ -601,7 +600,7 @@ static struct usb_serial_driver aircable_device = {
 	.num_ports =		1,
 	.attach =		aircable_attach,
 	.probe =		aircable_probe,
-	.shutdown =		aircable_shutdown,
+	.release =		aircable_release,
 	.write =		aircable_write,
 	.write_room =		aircable_write_room,
 	.write_bulk_callback =	aircable_write_bulk_callback,
diff --git a/drivers/usb/serial/belkin_sa.c b/drivers/usb/serial/belkin_sa.c
index 2bfd6dd85b5a..7033b031b443 100644
--- a/drivers/usb/serial/belkin_sa.c
+++ b/drivers/usb/serial/belkin_sa.c
@@ -90,7 +90,7 @@ static int debug;
 
 /* function prototypes for a Belkin USB Serial Adapter F5U103 */
 static int  belkin_sa_startup(struct usb_serial *serial);
-static void belkin_sa_shutdown(struct usb_serial *serial);
+static void belkin_sa_release(struct usb_serial *serial);
 static int  belkin_sa_open(struct tty_struct *tty,
 			struct usb_serial_port *port, struct file *filp);
 static void belkin_sa_close(struct usb_serial_port *port);
@@ -142,7 +142,7 @@ static struct usb_serial_driver belkin_device = {
 	.tiocmget =		belkin_sa_tiocmget,
 	.tiocmset =		belkin_sa_tiocmset,
 	.attach =		belkin_sa_startup,
-	.shutdown =		belkin_sa_shutdown,
+	.release =		belkin_sa_release,
 };
 
 
@@ -197,14 +197,13 @@ static int belkin_sa_startup(struct usb_serial *serial)
 }
 
 
-static void belkin_sa_shutdown(struct usb_serial *serial)
+static void belkin_sa_release(struct usb_serial *serial)
 {
 	struct belkin_sa_private *priv;
 	int i;
 
 	dbg("%s", __func__);
 
-	/* stop reads and writes on all ports */
 	for (i = 0; i < serial->num_ports; ++i) {
 		/* My special items, the standard routines free my urbs */
 		priv = usb_get_serial_port_data(serial->port[i]);
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 16a154d3b2fe..2b9eeda62bfe 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -50,7 +50,7 @@ static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
 		unsigned int, unsigned int);
 static void cp210x_break_ctl(struct tty_struct *, int);
 static int cp210x_startup(struct usb_serial *);
-static void cp210x_shutdown(struct usb_serial *);
+static void cp210x_disconnect(struct usb_serial *);
 
 static int debug;
 
@@ -137,7 +137,7 @@ static struct usb_serial_driver cp210x_device = {
 	.tiocmget 		= cp210x_tiocmget,
 	.tiocmset		= cp210x_tiocmset,
 	.attach			= cp210x_startup,
-	.shutdown		= cp210x_shutdown,
+	.disconnect		= cp210x_disconnect,
 };
 
 /* Config request types */
@@ -792,7 +792,7 @@ static int cp210x_startup(struct usb_serial *serial)
 	return 0;
 }
 
-static void cp210x_shutdown(struct usb_serial *serial)
+static void cp210x_disconnect(struct usb_serial *serial)
 {
 	int i;
 
diff --git a/drivers/usb/serial/cyberjack.c b/drivers/usb/serial/cyberjack.c
index 933ba913e66c..336523fd7366 100644
--- a/drivers/usb/serial/cyberjack.c
+++ b/drivers/usb/serial/cyberjack.c
@@ -58,7 +58,8 @@ static int debug;
 
 /* Function prototypes */
 static int cyberjack_startup(struct usb_serial *serial);
-static void cyberjack_shutdown(struct usb_serial *serial);
+static void cyberjack_disconnect(struct usb_serial *serial);
+static void cyberjack_release(struct usb_serial *serial);
 static int  cyberjack_open(struct tty_struct *tty,
 			struct usb_serial_port *port, struct file *filp);
 static void cyberjack_close(struct usb_serial_port *port);
@@ -94,7 +95,8 @@ static struct usb_serial_driver cyberjack_device = {
 	.id_table =		id_table,
 	.num_ports =		1,
 	.attach =		cyberjack_startup,
-	.shutdown =		cyberjack_shutdown,
+	.disconnect =		cyberjack_disconnect,
+	.release =		cyberjack_release,
 	.open =			cyberjack_open,
 	.close =		cyberjack_close,
 	.write =		cyberjack_write,
@@ -148,17 +150,25 @@ static int cyberjack_startup(struct usb_serial *serial)
 	return 0;
 }
 
-static void cyberjack_shutdown(struct usb_serial *serial)
+static void cyberjack_disconnect(struct usb_serial *serial)
 {
 	int i;
 
 	dbg("%s", __func__);
 
-	for (i = 0; i < serial->num_ports; ++i) {
+	for (i = 0; i < serial->num_ports; ++i)
 		usb_kill_urb(serial->port[i]->interrupt_in_urb);
+}
+
+static void cyberjack_release(struct usb_serial *serial)
+{
+	int i;
+
+	dbg("%s", __func__);
+
+	for (i = 0; i < serial->num_ports; ++i) {
 		/* My special items, the standard routines free my urbs */
 		kfree(usb_get_serial_port_data(serial->port[i]));
-		usb_set_serial_port_data(serial->port[i], NULL);
 	}
 }
 
diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index 669f93848539..9734085fd2fe 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -171,7 +171,7 @@ struct cypress_buf {
 static int  cypress_earthmate_startup(struct usb_serial *serial);
 static int  cypress_hidcom_startup(struct usb_serial *serial);
 static int  cypress_ca42v2_startup(struct usb_serial *serial);
-static void cypress_shutdown(struct usb_serial *serial);
+static void cypress_release(struct usb_serial *serial);
 static int  cypress_open(struct tty_struct *tty,
 			struct usb_serial_port *port, struct file *filp);
 static void cypress_close(struct usb_serial_port *port);
@@ -215,7 +215,7 @@ static struct usb_serial_driver cypress_earthmate_device = {
 	.id_table =			id_table_earthmate,
 	.num_ports =			1,
 	.attach =			cypress_earthmate_startup,
-	.shutdown =			cypress_shutdown,
+	.release =			cypress_release,
 	.open =				cypress_open,
 	.close =			cypress_close,
 	.dtr_rts =			cypress_dtr_rts,
@@ -242,7 +242,7 @@ static struct usb_serial_driver cypress_hidcom_device = {
 	.id_table =			id_table_cyphidcomrs232,
 	.num_ports =			1,
 	.attach =			cypress_hidcom_startup,
-	.shutdown =			cypress_shutdown,
+	.release =			cypress_release,
 	.open =				cypress_open,
 	.close =			cypress_close,
 	.dtr_rts =			cypress_dtr_rts,
@@ -269,7 +269,7 @@ static struct usb_serial_driver cypress_ca42v2_device = {
 	.id_table =			id_table_nokiaca42v2,
 	.num_ports =			1,
 	.attach =			cypress_ca42v2_startup,
-	.shutdown =			cypress_shutdown,
+	.release =			cypress_release,
 	.open =				cypress_open,
 	.close =			cypress_close,
 	.dtr_rts =			cypress_dtr_rts,
@@ -616,7 +616,7 @@ static int cypress_ca42v2_startup(struct usb_serial *serial)
 } /* cypress_ca42v2_startup */
 
 
-static void cypress_shutdown(struct usb_serial *serial)
+static void cypress_release(struct usb_serial *serial)
 {
 	struct cypress_private *priv;
 
@@ -629,7 +629,6 @@ static void cypress_shutdown(struct usb_serial *serial)
 	if (priv) {
 		cypress_buf_free(priv->buf);
 		kfree(priv);
-		usb_set_serial_port_data(serial->port[0], NULL);
 	}
 }
 
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index 30f5140eff03..f4808091c47c 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -460,7 +460,8 @@ static int digi_carrier_raised(struct usb_serial_port *port);
 static void digi_dtr_rts(struct usb_serial_port *port, int on);
 static int digi_startup_device(struct usb_serial *serial);
 static int digi_startup(struct usb_serial *serial);
-static void digi_shutdown(struct usb_serial *serial);
+static void digi_disconnect(struct usb_serial *serial);
+static void digi_release(struct usb_serial *serial);
 static void digi_read_bulk_callback(struct urb *urb);
 static int digi_read_inb_callback(struct urb *urb);
 static int digi_read_oob_callback(struct urb *urb);
@@ -524,7 +525,8 @@ static struct usb_serial_driver digi_acceleport_2_device = {
 	.tiocmget =			digi_tiocmget,
 	.tiocmset =			digi_tiocmset,
 	.attach =			digi_startup,
-	.shutdown =			digi_shutdown,
+	.disconnect =			digi_disconnect,
+	.release =			digi_release,
 };
 
 static struct usb_serial_driver digi_acceleport_4_device = {
@@ -550,7 +552,8 @@ static struct usb_serial_driver digi_acceleport_4_device = {
 	.tiocmget =			digi_tiocmget,
 	.tiocmset =			digi_tiocmset,
 	.attach =			digi_startup,
-	.shutdown =			digi_shutdown,
+	.disconnect =			digi_disconnect,
+	.release =			digi_release,
 };
 
 
@@ -1556,16 +1559,23 @@ static int digi_startup(struct usb_serial *serial)
 }
 
 
-static void digi_shutdown(struct usb_serial *serial)
+static void digi_disconnect(struct usb_serial *serial)
 {
 	int i;
-	dbg("digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt());
+	dbg("digi_disconnect: TOP, in_interrupt()=%ld", in_interrupt());
 
 	/* stop reads and writes on all ports */
 	for (i = 0; i < serial->type->num_ports + 1; i++) {
 		usb_kill_urb(serial->port[i]->read_urb);
 		usb_kill_urb(serial->port[i]->write_urb);
 	}
+}
+
+
+static void digi_release(struct usb_serial *serial)
+{
+	int i;
+	dbg("digi_release: TOP, in_interrupt()=%ld", in_interrupt());
 
 	/* free the private data structures for all ports */
 	/* number of regular ports + 1 for the out-of-band port */
diff --git a/drivers/usb/serial/empeg.c b/drivers/usb/serial/empeg.c
index 2b141ccb0cd9..80cb3471adbe 100644
--- a/drivers/usb/serial/empeg.c
+++ b/drivers/usb/serial/empeg.c
@@ -90,7 +90,6 @@ static int  empeg_chars_in_buffer(struct tty_struct *tty);
 static void empeg_throttle(struct tty_struct *tty);
 static void empeg_unthrottle(struct tty_struct *tty);
 static int  empeg_startup(struct usb_serial *serial);
-static void empeg_shutdown(struct usb_serial *serial);
 static void empeg_set_termios(struct tty_struct *tty,
 		struct usb_serial_port *port, struct ktermios *old_termios);
 static void empeg_write_bulk_callback(struct urb *urb);
@@ -124,7 +123,6 @@ static struct usb_serial_driver empeg_device = {
 	.throttle =		empeg_throttle,
 	.unthrottle =		empeg_unthrottle,
 	.attach =		empeg_startup,
-	.shutdown =		empeg_shutdown,
 	.set_termios =		empeg_set_termios,
 	.write =		empeg_write,
 	.write_room =		empeg_write_room,
@@ -427,12 +425,6 @@ static int  empeg_startup(struct usb_serial *serial)
 }
 
 
-static void empeg_shutdown(struct usb_serial *serial)
-{
-	dbg("%s", __func__);
-}
-
-
 static void empeg_set_termios(struct tty_struct *tty,
 		struct usb_serial_port *port, struct ktermios *old_termios)
 {
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index fc423583eede..3dc3768ca71c 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -720,7 +720,6 @@ static const char *ftdi_chip_name[] = {
 /* function prototypes for a FTDI serial converter */
 static int  ftdi_sio_probe(struct usb_serial *serial,
 					const struct usb_device_id *id);
-static void ftdi_shutdown(struct usb_serial *serial);
 static int  ftdi_sio_port_probe(struct usb_serial_port *port);
 static int  ftdi_sio_port_remove(struct usb_serial_port *port);
 static int  ftdi_open(struct tty_struct *tty,
@@ -779,7 +778,6 @@ static struct usb_serial_driver ftdi_sio_device = {
 	.ioctl =		ftdi_ioctl,
 	.set_termios =		ftdi_set_termios,
 	.break_ctl =		ftdi_break_ctl,
-	.shutdown =		ftdi_shutdown,
 };
 
 
@@ -1594,18 +1592,6 @@ static int ftdi_mtxorb_hack_setup(struct usb_serial *serial)
 	return 0;
 }
 
-/* ftdi_shutdown is called from usbserial:usb_serial_disconnect
- *   it is called when the usb device is disconnected
- *
- *   usbserial:usb_serial_disconnect
- *      calls __serial_close for each open of the port
- *      shutdown is called then (ie ftdi_shutdown)
- */
-static void ftdi_shutdown(struct usb_serial *serial)
-{
-	dbg("%s", __func__);
-}
-
 static void ftdi_sio_priv_release(struct kref *k)
 {
 	struct ftdi_private *priv = container_of(k, struct ftdi_private, kref);
diff --git a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c
index 5092d6aba659..8839f1c70b7f 100644
--- a/drivers/usb/serial/garmin_gps.c
+++ b/drivers/usb/serial/garmin_gps.c
@@ -1475,7 +1475,7 @@ static int garmin_attach(struct usb_serial *serial)
 }
 
 
-static void garmin_shutdown(struct usb_serial *serial)
+static void garmin_disconnect(struct usb_serial *serial)
 {
 	struct usb_serial_port *port = serial->port[0];
 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
@@ -1484,8 +1484,17 @@ static void garmin_shutdown(struct usb_serial *serial)
 
 	usb_kill_urb(port->interrupt_in_urb);
 	del_timer_sync(&garmin_data_p->timer);
+}
+
+
+static void garmin_release(struct usb_serial *serial)
+{
+	struct usb_serial_port *port = serial->port[0];
+	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+
+	dbg("%s", __func__);
+
 	kfree(garmin_data_p);
-	usb_set_serial_port_data(port, NULL);
 }
 
 
@@ -1504,7 +1513,8 @@ static struct usb_serial_driver garmin_device = {
 	.throttle            = garmin_throttle,
 	.unthrottle          = garmin_unthrottle,
 	.attach              = garmin_attach,
-	.shutdown            = garmin_shutdown,
+	.disconnect          = garmin_disconnect,
+	.release             = garmin_release,
 	.write               = garmin_write,
 	.write_room          = garmin_write_room,
 	.write_bulk_callback = garmin_write_bulk_callback,
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 8dabac1929b0..932d6241b787 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -63,7 +63,8 @@ struct usb_serial_driver usb_serial_generic_device = {
 	.id_table =		generic_device_ids,
 	.usb_driver = 		&generic_driver,
 	.num_ports =		1,
-	.shutdown =		usb_serial_generic_shutdown,
+	.disconnect =		usb_serial_generic_disconnect,
+	.release =		usb_serial_generic_release,
 	.throttle =		usb_serial_generic_throttle,
 	.unthrottle =		usb_serial_generic_unthrottle,
 	.resume =		usb_serial_generic_resume,
@@ -551,7 +552,7 @@ int usb_serial_handle_break(struct usb_serial_port *port)
 }
 EXPORT_SYMBOL_GPL(usb_serial_handle_break);
 
-void usb_serial_generic_shutdown(struct usb_serial *serial)
+void usb_serial_generic_disconnect(struct usb_serial *serial)
 {
 	int i;
 
@@ -562,3 +563,7 @@ void usb_serial_generic_shutdown(struct usb_serial *serial)
 		generic_cleanup(serial->port[i]);
 }
 
+void usb_serial_generic_release(struct usb_serial *serial)
+{
+	dbg("%s", __func__);
+}
diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index 53ef5996e33d..0191693625d6 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -224,7 +224,8 @@ static int  edge_tiocmget(struct tty_struct *tty, struct file *file);
 static int  edge_tiocmset(struct tty_struct *tty, struct file *file,
 					unsigned int set, unsigned int clear);
 static int  edge_startup(struct usb_serial *serial);
-static void edge_shutdown(struct usb_serial *serial);
+static void edge_disconnect(struct usb_serial *serial);
+static void edge_release(struct usb_serial *serial);
 
 #include "io_tables.h"	/* all of the devices that this driver supports */
 
@@ -3193,21 +3194,16 @@ static int edge_startup(struct usb_serial *serial)
 
 
 /****************************************************************************
- * edge_shutdown
+ * edge_disconnect
  *	This function is called whenever the device is removed from the usb bus.
  ****************************************************************************/
-static void edge_shutdown(struct usb_serial *serial)
+static void edge_disconnect(struct usb_serial *serial)
 {
 	struct edgeport_serial *edge_serial = usb_get_serial_data(serial);
-	int i;
 
 	dbg("%s", __func__);
 
 	/* stop reads and writes on all ports */
-	for (i = 0; i < serial->num_ports; ++i) {
-		kfree(usb_get_serial_port_data(serial->port[i]));
-		usb_set_serial_port_data(serial->port[i],  NULL);
-	}
 	/* free up our endpoint stuff */
 	if (edge_serial->is_epic) {
 		usb_kill_urb(edge_serial->interrupt_read_urb);
@@ -3218,9 +3214,24 @@ static void edge_shutdown(struct usb_serial *serial)
 		usb_free_urb(edge_serial->read_urb);
 		kfree(edge_serial->bulk_in_buffer);
 	}
+}
+
+
+/****************************************************************************
+ * edge_release
+ *	This function is called when the device structure is deallocated.
+ ****************************************************************************/
+static void edge_release(struct usb_serial *serial)
+{
+	struct edgeport_serial *edge_serial = usb_get_serial_data(serial);
+	int i;
+
+	dbg("%s", __func__);
+
+	for (i = 0; i < serial->num_ports; ++i)
+		kfree(usb_get_serial_port_data(serial->port[i]));
 
 	kfree(edge_serial);
-	usb_set_serial_data(serial, NULL);
 }
 
 
diff --git a/drivers/usb/serial/io_tables.h b/drivers/usb/serial/io_tables.h
index 7eb9d67b81b6..9241d3147513 100644
--- a/drivers/usb/serial/io_tables.h
+++ b/drivers/usb/serial/io_tables.h
@@ -117,7 +117,8 @@ static struct usb_serial_driver edgeport_2port_device = {
 	.throttle		= edge_throttle,
 	.unthrottle		= edge_unthrottle,
 	.attach			= edge_startup,
-	.shutdown		= edge_shutdown,
+	.disconnect		= edge_disconnect,
+	.release		= edge_release,
 	.ioctl			= edge_ioctl,
 	.set_termios		= edge_set_termios,
 	.tiocmget		= edge_tiocmget,
@@ -145,7 +146,8 @@ static struct usb_serial_driver edgeport_4port_device = {
 	.throttle		= edge_throttle,
 	.unthrottle		= edge_unthrottle,
 	.attach			= edge_startup,
-	.shutdown		= edge_shutdown,
+	.disconnect		= edge_disconnect,
+	.release		= edge_release,
 	.ioctl			= edge_ioctl,
 	.set_termios		= edge_set_termios,
 	.tiocmget		= edge_tiocmget,
@@ -173,7 +175,8 @@ static struct usb_serial_driver edgeport_8port_device = {
 	.throttle		= edge_throttle,
 	.unthrottle		= edge_unthrottle,
 	.attach			= edge_startup,
-	.shutdown		= edge_shutdown,
+	.disconnect		= edge_disconnect,
+	.release		= edge_release,
 	.ioctl			= edge_ioctl,
 	.set_termios		= edge_set_termios,
 	.tiocmget		= edge_tiocmget,
@@ -200,7 +203,8 @@ static struct usb_serial_driver epic_device = {
 	.throttle		= edge_throttle,
 	.unthrottle		= edge_unthrottle,
 	.attach			= edge_startup,
-	.shutdown		= edge_shutdown,
+	.disconnect		= edge_disconnect,
+	.release		= edge_release,
 	.ioctl			= edge_ioctl,
 	.set_termios		= edge_set_termios,
 	.tiocmget		= edge_tiocmget,
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index db964db42d3c..e8bc42f92e79 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -2663,7 +2663,7 @@ cleanup:
 	return -ENOMEM;
 }
 
-static void edge_shutdown(struct usb_serial *serial)
+static void edge_disconnect(struct usb_serial *serial)
 {
 	int i;
 	struct edgeport_port *edge_port;
@@ -2673,12 +2673,22 @@ static void edge_shutdown(struct usb_serial *serial)
 	for (i = 0; i < serial->num_ports; ++i) {
 		edge_port = usb_get_serial_port_data(serial->port[i]);
 		edge_remove_sysfs_attrs(edge_port->port);
+	}
+}
+
+static void edge_release(struct usb_serial *serial)
+{
+	int i;
+	struct edgeport_port *edge_port;
+
+	dbg("%s", __func__);
+
+	for (i = 0; i < serial->num_ports; ++i) {
+		edge_port = usb_get_serial_port_data(serial->port[i]);
 		edge_buf_free(edge_port->ep_out_buf);
 		kfree(edge_port);
-		usb_set_serial_port_data(serial->port[i], NULL);
 	}
 	kfree(usb_get_serial_data(serial));
-	usb_set_serial_data(serial, NULL);
 }
 
 
@@ -2915,7 +2925,8 @@ static struct usb_serial_driver edgeport_1port_device = {
 	.throttle		= edge_throttle,
 	.unthrottle		= edge_unthrottle,
 	.attach			= edge_startup,
-	.shutdown		= edge_shutdown,
+	.disconnect		= edge_disconnect,
+	.release		= edge_release,
 	.port_probe		= edge_create_sysfs_attrs,
 	.ioctl			= edge_ioctl,
 	.set_termios		= edge_set_termios,
@@ -2944,7 +2955,8 @@ static struct usb_serial_driver edgeport_2port_device = {
 	.throttle		= edge_throttle,
 	.unthrottle		= edge_unthrottle,
 	.attach			= edge_startup,
-	.shutdown		= edge_shutdown,
+	.disconnect		= edge_disconnect,
+	.release		= edge_release,
 	.port_probe		= edge_create_sysfs_attrs,
 	.ioctl			= edge_ioctl,
 	.set_termios		= edge_set_termios,
diff --git a/drivers/usb/serial/ipaq.c b/drivers/usb/serial/ipaq.c
index c610a99fa477..2545d45ce16f 100644
--- a/drivers/usb/serial/ipaq.c
+++ b/drivers/usb/serial/ipaq.c
@@ -79,7 +79,6 @@ static int  ipaq_open(struct tty_struct *tty,
 static void ipaq_close(struct usb_serial_port *port);
 static int  ipaq_calc_num_ports(struct usb_serial *serial);
 static int  ipaq_startup(struct usb_serial *serial);
-static void ipaq_shutdown(struct usb_serial *serial);
 static int ipaq_write(struct tty_struct *tty, struct usb_serial_port *port,
 			const unsigned char *buf, int count);
 static int ipaq_write_bulk(struct usb_serial_port *port,
@@ -576,7 +575,6 @@ static struct usb_serial_driver ipaq_device = {
 	.close =		ipaq_close,
 	.attach =		ipaq_startup,
 	.calc_num_ports =	ipaq_calc_num_ports,
-	.shutdown =		ipaq_shutdown,
 	.write =		ipaq_write,
 	.write_room =		ipaq_write_room,
 	.chars_in_buffer =	ipaq_chars_in_buffer,
@@ -990,11 +988,6 @@ static int ipaq_startup(struct usb_serial *serial)
 	return usb_reset_configuration(serial->dev);
 }
 
-static void ipaq_shutdown(struct usb_serial *serial)
-{
-	dbg("%s", __func__);
-}
-
 static int __init ipaq_init(void)
 {
 	int retval;
diff --git a/drivers/usb/serial/iuu_phoenix.c b/drivers/usb/serial/iuu_phoenix.c
index 76a3cc327bb9..96873a7a32b0 100644
--- a/drivers/usb/serial/iuu_phoenix.c
+++ b/drivers/usb/serial/iuu_phoenix.c
@@ -121,8 +121,8 @@ static int iuu_startup(struct usb_serial *serial)
 	return 0;
 }
 
-/* Shutdown function */
-static void iuu_shutdown(struct usb_serial *serial)
+/* Release function */
+static void iuu_release(struct usb_serial *serial)
 {
 	struct usb_serial_port *port = serial->port[0];
 	struct iuu_private *priv = usb_get_serial_port_data(port);
@@ -1202,7 +1202,7 @@ static struct usb_serial_driver iuu_device = {
 	.tiocmset = iuu_tiocmset,
 	.set_termios = iuu_set_termios,
 	.attach = iuu_startup,
-	.shutdown = iuu_shutdown,
+	.release = iuu_release,
 };
 
 static int __init iuu_init(void)
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index f1195a98f316..2594b8743d3f 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -2689,7 +2689,7 @@ static int keyspan_startup(struct usb_serial *serial)
 	return 0;
 }
 
-static void keyspan_shutdown(struct usb_serial *serial)
+static void keyspan_disconnect(struct usb_serial *serial)
 {
 	int				i, j;
 	struct usb_serial_port		*port;
@@ -2729,6 +2729,17 @@ static void keyspan_shutdown(struct usb_serial *serial)
 			usb_free_urb(p_priv->out_urbs[j]);
 		}
 	}
+}
+
+static void keyspan_release(struct usb_serial *serial)
+{
+	int				i;
+	struct usb_serial_port		*port;
+	struct keyspan_serial_private 	*s_priv;
+
+	dbg("%s", __func__);
+
+	s_priv = usb_get_serial_data(serial);
 
 	/*  dbg("Freeing serial->private."); */
 	kfree(s_priv);
diff --git a/drivers/usb/serial/keyspan.h b/drivers/usb/serial/keyspan.h
index 0d4569b60768..3107ed15af64 100644
--- a/drivers/usb/serial/keyspan.h
+++ b/drivers/usb/serial/keyspan.h
@@ -41,7 +41,8 @@ static int  keyspan_open		(struct tty_struct *tty,
 static void keyspan_close		(struct usb_serial_port *port);
 static void keyspan_dtr_rts		(struct usb_serial_port *port, int on);
 static int  keyspan_startup		(struct usb_serial *serial);
-static void keyspan_shutdown		(struct usb_serial *serial);
+static void keyspan_disconnect		(struct usb_serial *serial);
+static void keyspan_release		(struct usb_serial *serial);
 static int  keyspan_write_room		(struct tty_struct *tty);
 
 static int  keyspan_write		(struct tty_struct *tty,
@@ -569,7 +570,8 @@ static struct usb_serial_driver keyspan_1port_device = {
 	.tiocmget		= keyspan_tiocmget,
 	.tiocmset		= keyspan_tiocmset,
 	.attach			= keyspan_startup,
-	.shutdown		= keyspan_shutdown,
+	.disconnect		= keyspan_disconnect,
+	.release		= keyspan_release,
 };
 
 static struct usb_serial_driver keyspan_2port_device = {
@@ -590,7 +592,8 @@ static struct usb_serial_driver keyspan_2port_device = {
 	.tiocmget		= keyspan_tiocmget,
 	.tiocmset		= keyspan_tiocmset,
 	.attach			= keyspan_startup,
-	.shutdown		= keyspan_shutdown,
+	.disconnect		= keyspan_disconnect,
+	.release		= keyspan_release,
 };
 
 static struct usb_serial_driver keyspan_4port_device = {
@@ -611,7 +614,8 @@ static struct usb_serial_driver keyspan_4port_device = {
 	.tiocmget		= keyspan_tiocmget,
 	.tiocmset		= keyspan_tiocmset,
 	.attach			= keyspan_startup,
-	.shutdown		= keyspan_shutdown,
+	.disconnect		= keyspan_disconnect,
+	.release		= keyspan_release,
 };
 
 #endif
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index ab769dbea1b3..d0b12e40c2b1 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -809,7 +809,7 @@ static int keyspan_pda_startup(struct usb_serial *serial)
 	return 0;
 }
 
-static void keyspan_pda_shutdown(struct usb_serial *serial)
+static void keyspan_pda_release(struct usb_serial *serial)
 {
 	dbg("%s", __func__);
 
@@ -869,7 +869,7 @@ static struct usb_serial_driver keyspan_pda_device = {
 	.tiocmget =		keyspan_pda_tiocmget,
 	.tiocmset =		keyspan_pda_tiocmset,
 	.attach =		keyspan_pda_startup,
-	.shutdown =		keyspan_pda_shutdown,
+	.release =		keyspan_pda_release,
 };
 
 
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)
diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index 6b570498287f..6db0e561f680 100644
--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -69,7 +69,7 @@ static int debug;
 
 /* Function prototypes */
 static int  kobil_startup(struct usb_serial *serial);
-static void kobil_shutdown(struct usb_serial *serial);
+static void kobil_release(struct usb_serial *serial);
 static int  kobil_open(struct tty_struct *tty,
 			struct usb_serial_port *port, struct file *filp);
 static void kobil_close(struct usb_serial_port *port);
@@ -117,7 +117,7 @@ static struct usb_serial_driver kobil_device = {
 	.id_table =		id_table,
 	.num_ports =		1,
 	.attach =		kobil_startup,
-	.shutdown =		kobil_shutdown,
+	.release =		kobil_release,
 	.ioctl =		kobil_ioctl,
 	.set_termios =		kobil_set_termios,
 	.tiocmget =		kobil_tiocmget,
@@ -201,17 +201,13 @@ static int kobil_startup(struct usb_serial *serial)
 }
 
 
-static void kobil_shutdown(struct usb_serial *serial)
+static void kobil_release(struct usb_serial *serial)
 {
 	int i;
 	dbg("%s - port %d", __func__, serial->port[0]->number);
 
-	for (i = 0; i < serial->num_ports; ++i) {
-		while (serial->port[i]->port.count > 0)
-			kobil_close(serial->port[i]);
+	for (i = 0; i < serial->num_ports; ++i)
 		kfree(usb_get_serial_port_data(serial->port[i]));
-		usb_set_serial_port_data(serial->port[i], NULL);
-	}
 }
 
 
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index 873795548fc0..d8825e159aa5 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -92,7 +92,7 @@ static int debug;
  * Function prototypes
  */
 static int  mct_u232_startup(struct usb_serial *serial);
-static void mct_u232_shutdown(struct usb_serial *serial);
+static void mct_u232_release(struct usb_serial *serial);
 static int  mct_u232_open(struct tty_struct *tty,
 			struct usb_serial_port *port, struct file *filp);
 static void mct_u232_close(struct usb_serial_port *port);
@@ -149,7 +149,7 @@ static struct usb_serial_driver mct_u232_device = {
 	.tiocmget =	     mct_u232_tiocmget,
 	.tiocmset =	     mct_u232_tiocmset,
 	.attach =	     mct_u232_startup,
-	.shutdown =	     mct_u232_shutdown,
+	.release =	     mct_u232_release,
 };
 
 
@@ -407,7 +407,7 @@ static int mct_u232_startup(struct usb_serial *serial)
 } /* mct_u232_startup */
 
 
-static void mct_u232_shutdown(struct usb_serial *serial)
+static void mct_u232_release(struct usb_serial *serial)
 {
 	struct mct_u232_private *priv;
 	int i;
@@ -417,12 +417,9 @@ static void mct_u232_shutdown(struct usb_serial *serial)
 	for (i = 0; i < serial->num_ports; ++i) {
 		/* My special items, the standard routines free my urbs */
 		priv = usb_get_serial_port_data(serial->port[i]);
-		if (priv) {
-			usb_set_serial_port_data(serial->port[i], NULL);
-			kfree(priv);
-		}
+		kfree(priv);
 	}
-} /* mct_u232_shutdown */
+} /* mct_u232_release */
 
 static int  mct_u232_open(struct tty_struct *tty,
 			struct usb_serial_port *port, struct file *filp)
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 9e1a013ee7f6..bfc5ce000ef9 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -1521,19 +1521,16 @@ static int mos7720_startup(struct usb_serial *serial)
 	return 0;
 }
 
-static void mos7720_shutdown(struct usb_serial *serial)
+static void mos7720_release(struct usb_serial *serial)
 {
 	int i;
 
 	/* free private structure allocated for serial port */
-	for (i = 0; i < serial->num_ports; ++i) {
+	for (i = 0; i < serial->num_ports; ++i)
 		kfree(usb_get_serial_port_data(serial->port[i]));
-		usb_set_serial_port_data(serial->port[i], NULL);
-	}
 
 	/* free private structure allocated for serial device */
 	kfree(usb_get_serial_data(serial));
-	usb_set_serial_data(serial, NULL);
 }
 
 static struct usb_driver usb_driver = {
@@ -1558,7 +1555,7 @@ static struct usb_serial_driver moschip7720_2port_driver = {
 	.throttle		= mos7720_throttle,
 	.unthrottle		= mos7720_unthrottle,
 	.attach			= mos7720_startup,
-	.shutdown		= mos7720_shutdown,
+	.release		= mos7720_release,
 	.ioctl			= mos7720_ioctl,
 	.set_termios		= mos7720_set_termios,
 	.write			= mos7720_write,
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 5fe9fe3df772..c40f95c1951c 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -2633,16 +2633,16 @@ error:
 }
 
 /****************************************************************************
- * mos7840_shutdown
+ * mos7840_disconnect
  *	This function is called whenever the device is removed from the usb bus.
  ****************************************************************************/
 
-static void mos7840_shutdown(struct usb_serial *serial)
+static void mos7840_disconnect(struct usb_serial *serial)
 {
 	int i;
 	unsigned long flags;
 	struct moschip_port *mos7840_port;
-	dbg("%s", " shutdown :entering..........");
+	dbg("%s", " disconnect :entering..........");
 
 	if (!serial) {
 		dbg("%s", "Invalid Handler");
@@ -2662,11 +2662,42 @@ static void mos7840_shutdown(struct usb_serial *serial)
 			mos7840_port->zombie = 1;
 			spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
 			usb_kill_urb(mos7840_port->control_urb);
+		}
+	}
+
+	dbg("%s", "Thank u :: ");
+
+}
+
+/****************************************************************************
+ * mos7840_release
+ *	This function is called when the usb_serial structure is freed.
+ ****************************************************************************/
+
+static void mos7840_release(struct usb_serial *serial)
+{
+	int i;
+	struct moschip_port *mos7840_port;
+	dbg("%s", " release :entering..........");
+
+	if (!serial) {
+		dbg("%s", "Invalid Handler");
+		return;
+	}
+
+	/* check for the ports to be closed,close the ports and disconnect */
+
+	/* free private structure allocated for serial port  *
+	 * stop reads and writes on all ports                */
+
+	for (i = 0; i < serial->num_ports; ++i) {
+		mos7840_port = mos7840_get_port_private(serial->port[i]);
+		dbg("mos7840_port %d = %p", i, mos7840_port);
+		if (mos7840_port) {
 			kfree(mos7840_port->ctrl_buf);
 			kfree(mos7840_port->dr);
 			kfree(mos7840_port);
 		}
-		mos7840_set_port_private(serial->port[i], NULL);
 	}
 
 	dbg("%s", "Thank u :: ");
@@ -2707,7 +2738,8 @@ static struct usb_serial_driver moschip7840_4port_device = {
 	.tiocmget = mos7840_tiocmget,
 	.tiocmset = mos7840_tiocmset,
 	.attach = mos7840_startup,
-	.shutdown = mos7840_shutdown,
+	.disconnect = mos7840_disconnect,
+	.release = mos7840_release,
 	.read_bulk_callback = mos7840_bulk_in_callback,
 	.read_int_callback = mos7840_interrupt_callback,
 };
diff --git a/drivers/usb/serial/omninet.c b/drivers/usb/serial/omninet.c
index 1104617334f5..56857ddbd70b 100644
--- a/drivers/usb/serial/omninet.c
+++ b/drivers/usb/serial/omninet.c
@@ -72,7 +72,8 @@ static void omninet_write_bulk_callback(struct urb *urb);
 static int  omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
 				const unsigned char *buf, int count);
 static int  omninet_write_room(struct tty_struct *tty);
-static void omninet_shutdown(struct usb_serial *serial);
+static void omninet_disconnect(struct usb_serial *serial);
+static void omninet_release(struct usb_serial *serial);
 static int omninet_attach(struct usb_serial *serial);
 
 static struct usb_device_id id_table[] = {
@@ -108,7 +109,8 @@ static struct usb_serial_driver zyxel_omninet_device = {
 	.write_room =		omninet_write_room,
 	.read_bulk_callback =	omninet_read_bulk_callback,
 	.write_bulk_callback =	omninet_write_bulk_callback,
-	.shutdown =		omninet_shutdown,
+	.disconnect =		omninet_disconnect,
+	.release =		omninet_release,
 };
 
 
@@ -345,13 +347,22 @@ static void omninet_write_bulk_callback(struct urb *urb)
 }
 
 
-static void omninet_shutdown(struct usb_serial *serial)
+static void omninet_disconnect(struct usb_serial *serial)
 {
 	struct usb_serial_port *wport = serial->port[1];
-	struct usb_serial_port *port = serial->port[0];
+
 	dbg("%s", __func__);
 
 	usb_kill_urb(wport->write_urb);
+}
+
+
+static void omninet_release(struct usb_serial *serial)
+{
+	struct usb_serial_port *port = serial->port[0];
+
+	dbg("%s", __func__);
+
 	kfree(usb_get_serial_port_data(port));
 }
 
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index c20480aa9755..336bba79ad32 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -463,7 +463,7 @@ error:
 	return retval;
 }
 
-static void opticon_shutdown(struct usb_serial *serial)
+static void opticon_disconnect(struct usb_serial *serial)
 {
 	struct opticon_private *priv = usb_get_serial_data(serial);
 
@@ -471,9 +471,16 @@ static void opticon_shutdown(struct usb_serial *serial)
 
 	usb_kill_urb(priv->bulk_read_urb);
 	usb_free_urb(priv->bulk_read_urb);
+}
+
+static void opticon_release(struct usb_serial *serial)
+{
+	struct opticon_private *priv = usb_get_serial_data(serial);
+
+	dbg("%s", __func__);
+
 	kfree(priv->bulk_in_buffer);
 	kfree(priv);
-	usb_set_serial_data(serial, NULL);
 }
 
 static int opticon_suspend(struct usb_interface *intf, pm_message_t message)
@@ -524,7 +531,8 @@ static struct usb_serial_driver opticon_device = {
 	.close =		opticon_close,
 	.write =		opticon_write,
 	.write_room = 		opticon_write_room,
-	.shutdown =		opticon_shutdown,
+	.disconnect =		opticon_disconnect,
+	.release =		opticon_release,
 	.throttle = 		opticon_throttle,
 	.unthrottle =		opticon_unthrottle,
 	.ioctl =		opticon_ioctl,
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index a38971cc3731..575816e6ba37 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -51,7 +51,8 @@ static void option_close(struct usb_serial_port *port);
 static void option_dtr_rts(struct usb_serial_port *port, int on);
 
 static int  option_startup(struct usb_serial *serial);
-static void option_shutdown(struct usb_serial *serial);
+static void option_disconnect(struct usb_serial *serial);
+static void option_release(struct usb_serial *serial);
 static int  option_write_room(struct tty_struct *tty);
 
 static void option_instat_callback(struct urb *urb);
@@ -568,7 +569,8 @@ static struct usb_serial_driver option_1port_device = {
 	.tiocmget          = option_tiocmget,
 	.tiocmset          = option_tiocmset,
 	.attach            = option_startup,
-	.shutdown          = option_shutdown,
+	.disconnect        = option_disconnect,
+	.release           = option_release,
 	.read_int_callback = option_instat_callback,
 	.suspend           = option_suspend,
 	.resume            = option_resume,
@@ -1149,7 +1151,14 @@ static void stop_read_write_urbs(struct usb_serial *serial)
 	}
 }
 
-static void option_shutdown(struct usb_serial *serial)
+static void option_disconnect(struct usb_serial *serial)
+{
+	dbg("%s", __func__);
+
+	stop_read_write_urbs(serial);
+}
+
+static void option_release(struct usb_serial *serial)
 {
 	int i, j;
 	struct usb_serial_port *port;
@@ -1157,8 +1166,6 @@ static void option_shutdown(struct usb_serial *serial)
 
 	dbg("%s", __func__);
 
-	stop_read_write_urbs(serial);
-
 	/* Now free them */
 	for (i = 0; i < serial->num_ports; ++i) {
 		port = serial->port[i];
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c
index 7de54781fe61..3cece27325e7 100644
--- a/drivers/usb/serial/oti6858.c
+++ b/drivers/usb/serial/oti6858.c
@@ -159,7 +159,7 @@ static int oti6858_tiocmget(struct tty_struct *tty, struct file *file);
 static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
 				unsigned int set, unsigned int clear);
 static int oti6858_startup(struct usb_serial *serial);
-static void oti6858_shutdown(struct usb_serial *serial);
+static void oti6858_release(struct usb_serial *serial);
 
 /* functions operating on buffers */
 static struct oti6858_buf *oti6858_buf_alloc(unsigned int size);
@@ -194,7 +194,7 @@ static struct usb_serial_driver oti6858_device = {
 	.write_room =		oti6858_write_room,
 	.chars_in_buffer =	oti6858_chars_in_buffer,
 	.attach =		oti6858_startup,
-	.shutdown =		oti6858_shutdown,
+	.release =		oti6858_release,
 };
 
 struct oti6858_private {
@@ -782,7 +782,7 @@ static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
 }
 
 
-static void oti6858_shutdown(struct usb_serial *serial)
+static void oti6858_release(struct usb_serial *serial)
 {
 	struct oti6858_private *priv;
 	int i;
@@ -794,7 +794,6 @@ static void oti6858_shutdown(struct usb_serial *serial)
 		if (priv) {
 			oti6858_buf_free(priv->buf);
 			kfree(priv);
-			usb_set_serial_port_data(serial->port[i], NULL);
 		}
 	}
 }
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 6357b57f628c..ec6c132a25b5 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -878,7 +878,7 @@ static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
 		dbg("%s - error sending break = %d", __func__, result);
 }
 
-static void pl2303_shutdown(struct usb_serial *serial)
+static void pl2303_release(struct usb_serial *serial)
 {
 	int i;
 	struct pl2303_private *priv;
@@ -890,7 +890,6 @@ static void pl2303_shutdown(struct usb_serial *serial)
 		if (priv) {
 			pl2303_buf_free(priv->buf);
 			kfree(priv);
-			usb_set_serial_port_data(serial->port[i], NULL);
 		}
 	}
 }
@@ -1123,7 +1122,7 @@ static struct usb_serial_driver pl2303_device = {
 	.write_room =		pl2303_write_room,
 	.chars_in_buffer =	pl2303_chars_in_buffer,
 	.attach =		pl2303_startup,
-	.shutdown =		pl2303_shutdown,
+	.release =		pl2303_release,
 };
 
 static int __init pl2303_init(void)
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index a88cde950161..032f7aeb40a4 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -814,7 +814,7 @@ static int sierra_startup(struct usb_serial *serial)
 	return 0;
 }
 
-static void sierra_shutdown(struct usb_serial *serial)
+static void sierra_disconnect(struct usb_serial *serial)
 {
 	int i;
 	struct usb_serial_port *port;
@@ -853,7 +853,7 @@ static struct usb_serial_driver sierra_device = {
 	.tiocmget          = sierra_tiocmget,
 	.tiocmset          = sierra_tiocmset,
 	.attach            = sierra_startup,
-	.shutdown          = sierra_shutdown,
+	.disconnect        = sierra_disconnect,
 	.read_int_callback = sierra_instat_callback,
 };
 
diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c
index 8f7ed8f13996..3c249d8e8b8e 100644
--- a/drivers/usb/serial/spcp8x5.c
+++ b/drivers/usb/serial/spcp8x5.c
@@ -356,7 +356,7 @@ cleanup:
 }
 
 /* call when the device plug out. free all the memory alloced by probe */
-static void spcp8x5_shutdown(struct usb_serial *serial)
+static void spcp8x5_release(struct usb_serial *serial)
 {
 	int i;
 	struct spcp8x5_private *priv;
@@ -366,7 +366,6 @@ static void spcp8x5_shutdown(struct usb_serial *serial)
 		if (priv) {
 			free_ringbuf(priv->buf);
 			kfree(priv);
-			usb_set_serial_port_data(serial->port[i] , NULL);
 		}
 	}
 }
@@ -1020,7 +1019,7 @@ static struct usb_serial_driver spcp8x5_device = {
 	.write_bulk_callback	= spcp8x5_write_bulk_callback,
 	.chars_in_buffer 	= spcp8x5_chars_in_buffer,
 	.attach 		= spcp8x5_startup,
-	.shutdown 		= spcp8x5_shutdown,
+	.release 		= spcp8x5_release,
 };
 
 static int __init spcp8x5_init(void)
diff --git a/drivers/usb/serial/symbolserial.c b/drivers/usb/serial/symbolserial.c
index 8b07ebc6baeb..6157fac9366b 100644
--- a/drivers/usb/serial/symbolserial.c
+++ b/drivers/usb/serial/symbolserial.c
@@ -267,7 +267,7 @@ error:
 	return retval;
 }
 
-static void symbol_shutdown(struct usb_serial *serial)
+static void symbol_disconnect(struct usb_serial *serial)
 {
 	struct symbol_private *priv = usb_get_serial_data(serial);
 
@@ -275,9 +275,16 @@ static void symbol_shutdown(struct usb_serial *serial)
 
 	usb_kill_urb(priv->int_urb);
 	usb_free_urb(priv->int_urb);
+}
+
+static void symbol_release(struct usb_serial *serial)
+{
+	struct symbol_private *priv = usb_get_serial_data(serial);
+
+	dbg("%s", __func__);
+
 	kfree(priv->int_buffer);
 	kfree(priv);
-	usb_set_serial_data(serial, NULL);
 }
 
 static struct usb_driver symbol_driver = {
@@ -299,7 +306,8 @@ static struct usb_serial_driver symbol_device = {
 	.attach =		symbol_startup,
 	.open =			symbol_open,
 	.close =		symbol_close,
-	.shutdown =		symbol_shutdown,
+	.disconnect =		symbol_disconnect,
+	.release =		symbol_release,
 	.throttle = 		symbol_throttle,
 	.unthrottle =		symbol_unthrottle,
 };
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 42cb04c403be..991d8232e376 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -97,7 +97,7 @@ struct ti_device {
 /* Function Declarations */
 
 static int ti_startup(struct usb_serial *serial);
-static void ti_shutdown(struct usb_serial *serial);
+static void ti_release(struct usb_serial *serial);
 static int ti_open(struct tty_struct *tty, struct usb_serial_port *port,
 		struct file *file);
 static void ti_close(struct usb_serial_port *port);
@@ -230,7 +230,7 @@ static struct usb_serial_driver ti_1port_device = {
 	.id_table		= ti_id_table_3410,
 	.num_ports		= 1,
 	.attach			= ti_startup,
-	.shutdown		= ti_shutdown,
+	.release		= ti_release,
 	.open			= ti_open,
 	.close			= ti_close,
 	.write			= ti_write,
@@ -258,7 +258,7 @@ static struct usb_serial_driver ti_2port_device = {
 	.id_table		= ti_id_table_5052,
 	.num_ports		= 2,
 	.attach			= ti_startup,
-	.shutdown		= ti_shutdown,
+	.release		= ti_release,
 	.open			= ti_open,
 	.close			= ti_close,
 	.write			= ti_write,
@@ -473,7 +473,7 @@ free_tdev:
 }
 
 
-static void ti_shutdown(struct usb_serial *serial)
+static void ti_release(struct usb_serial *serial)
 {
 	int i;
 	struct ti_device *tdev = usb_get_serial_data(serial);
@@ -486,12 +486,10 @@ static void ti_shutdown(struct usb_serial *serial)
 		if (tport) {
 			ti_buf_free(tport->tp_write_buf);
 			kfree(tport);
-			usb_set_serial_port_data(serial->port[i], NULL);
 		}
 	}
 
 	kfree(tdev);
-	usb_set_serial_data(serial, NULL);
 }
 
 
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index da890f030fac..d595aa5586a7 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -141,6 +141,14 @@ static void destroy_serial(struct kref *kref)
 	if (serial->minor != SERIAL_TTY_NO_MINOR)
 		return_serial(serial);
 
+	serial->type->release(serial);
+
+	for (i = 0; i < serial->num_ports; ++i) {
+		port = serial->port[i];
+		if (port)
+			put_device(&port->dev);
+	}
+
 	/* If this is a "fake" port, we have to clean it up here, as it will
 	 * not get cleaned up in port_release() as it was never registered with
 	 * the driver core */
@@ -148,9 +156,8 @@ static void destroy_serial(struct kref *kref)
 		for (i = serial->num_ports;
 					i < serial->num_port_pointers; ++i) {
 			port = serial->port[i];
-			if (!port)
-				continue;
-			port_free(port);
+			if (port)
+				port_free(port);
 		}
 	}
 
@@ -1118,10 +1125,6 @@ void usb_serial_disconnect(struct usb_interface *interface)
 	serial->disconnected = 1;
 	mutex_unlock(&serial->disc_mutex);
 
-	/* Unfortunately, many of the sub-drivers expect the port structures
-	 * to exist when their shutdown method is called, so we have to go
-	 * through this awkward two-step unregistration procedure.
-	 */
 	for (i = 0; i < serial->num_ports; ++i) {
 		port = serial->port[i];
 		if (port) {
@@ -1153,14 +1156,7 @@ void usb_serial_disconnect(struct usb_interface *interface)
 			}
 		}
 	}
-	serial->type->shutdown(serial);
-	for (i = 0; i < serial->num_ports; ++i) {
-		port = serial->port[i];
-		if (port) {
-			put_device(&port->dev);
-			serial->port[i] = NULL;
-		}
-	}
+	serial->type->disconnect(serial);
 
 	/* let the last holder of this object
 	 * cause it to be cleaned up */
@@ -1338,7 +1334,8 @@ static void fixup_generic(struct usb_serial_driver *device)
 	set_to_generic_if_null(device, chars_in_buffer);
 	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, disconnect);
+	set_to_generic_if_null(device, release);
 }
 
 int usb_serial_register(struct usb_serial_driver *driver)
diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index b15f1c0e1d4a..f5d0f64dcc52 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -47,7 +47,7 @@ static void visor_unthrottle(struct tty_struct *tty);
 static int  visor_probe(struct usb_serial *serial,
 					const struct usb_device_id *id);
 static int  visor_calc_num_ports(struct usb_serial *serial);
-static void visor_shutdown(struct usb_serial *serial);
+static void visor_release(struct usb_serial *serial);
 static void visor_write_bulk_callback(struct urb *urb);
 static void visor_read_bulk_callback(struct urb *urb);
 static void visor_read_int_callback(struct urb *urb);
@@ -202,7 +202,7 @@ static struct usb_serial_driver handspring_device = {
 	.attach =		treo_attach,
 	.probe =		visor_probe,
 	.calc_num_ports =	visor_calc_num_ports,
-	.shutdown =		visor_shutdown,
+	.release =		visor_release,
 	.write =		visor_write,
 	.write_room =		visor_write_room,
 	.write_bulk_callback =	visor_write_bulk_callback,
@@ -227,7 +227,7 @@ static struct usb_serial_driver clie_5_device = {
 	.attach =		clie_5_attach,
 	.probe =		visor_probe,
 	.calc_num_ports =	visor_calc_num_ports,
-	.shutdown =		visor_shutdown,
+	.release =		visor_release,
 	.write =		visor_write,
 	.write_room =		visor_write_room,
 	.write_bulk_callback =	visor_write_bulk_callback,
@@ -918,7 +918,7 @@ static int clie_5_attach(struct usb_serial *serial)
 	return generic_startup(serial);
 }
 
-static void visor_shutdown(struct usb_serial *serial)
+static void visor_release(struct usb_serial *serial)
 {
 	struct visor_private *priv;
 	int i;
@@ -927,10 +927,7 @@ static void visor_shutdown(struct usb_serial *serial)
 
 	for (i = 0; i < serial->num_ports; i++) {
 		priv = usb_get_serial_port_data(serial->port[i]);
-		if (priv) {
-			usb_set_serial_port_data(serial->port[i], NULL);
-			kfree(priv);
-		}
+		kfree(priv);
 	}
 }
 
diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index 7c7295d09f34..8d126dd7a02e 100644
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -144,7 +144,7 @@ static int  whiteheat_firmware_attach(struct usb_serial *serial);
 
 /* function prototypes for the Connect Tech WhiteHEAT serial converter */
 static int  whiteheat_attach(struct usb_serial *serial);
-static void whiteheat_shutdown(struct usb_serial *serial);
+static void whiteheat_release(struct usb_serial *serial);
 static int  whiteheat_open(struct tty_struct *tty,
 			struct usb_serial_port *port, struct file *filp);
 static void whiteheat_close(struct usb_serial_port *port);
@@ -189,7 +189,7 @@ static struct usb_serial_driver whiteheat_device = {
 	.id_table =		id_table_std,
 	.num_ports =		4,
 	.attach =		whiteheat_attach,
-	.shutdown =		whiteheat_shutdown,
+	.release =		whiteheat_release,
 	.open =			whiteheat_open,
 	.close =		whiteheat_close,
 	.write =		whiteheat_write,
@@ -617,7 +617,7 @@ no_command_buffer:
 }
 
 
-static void whiteheat_shutdown(struct usb_serial *serial)
+static void whiteheat_release(struct usb_serial *serial)
 {
 	struct usb_serial_port *command_port;
 	struct usb_serial_port *port;
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,