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USB: metro-usb: fix port-data memory leak 

Fix port-data memory leak by moving port data allocation and
deallocation to port_probe and port_remove.

Since commit 0998d06310 (device-core: Ensure drvdata = NULL when no
driver is bound) the port private data is no longer freed at release as
it is no longer accessible.

Note that the call to metrousb_clean (close) in shutdown was redundant.

Compile-only tested.

Cc: <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2012-10-25 10:28:59 +02:00 committed by Greg Kroah-Hartman
parent d7870af7e2
commit 50dde8686e
1 changed files with 16 additions and 40 deletions
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56
drivers/usb/serial/metro-usb.c
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@ -271,51 +271,27 @@ static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int contr
return retval;
}
static void metrousb_shutdown(struct usb_serial *serial)
{
int i = 0;
dev_dbg(&serial->dev->dev, "%s\n", __func__);
/* Stop reading and writing on all ports. */
for (i = 0; i < serial->num_ports; ++i) {
/* Close any open urbs. */
metrousb_cleanup(serial->port[i]);
/* Free memory. */
kfree(usb_get_serial_port_data(serial->port[i]));
usb_set_serial_port_data(serial->port[i], NULL);
dev_dbg(&serial->dev->dev, "%s - freed port number=%d\n",
__func__, serial->port[i]->number);
}
}
static int metrousb_startup(struct usb_serial *serial)
static int metrousb_port_probe(struct usb_serial_port *port)
{
struct metrousb_private *metro_priv;
struct usb_serial_port *port;
int i = 0;
dev_dbg(&serial->dev->dev, "%s\n", __func__);
metro_priv = kzalloc(sizeof(*metro_priv), GFP_KERNEL);
if (!metro_priv)
return -ENOMEM;
/* Loop through the serial ports setting up the private structures.
* Currently we only use one port. */
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
spin_lock_init(&metro_priv->lock);
/* Declare memory. */
metro_priv = kzalloc(sizeof(struct metrousb_private), GFP_KERNEL);
if (!metro_priv)
return -ENOMEM;
usb_set_serial_port_data(port, metro_priv);
/* Initialize memory. */
spin_lock_init(&metro_priv->lock);
usb_set_serial_port_data(port, metro_priv);
return 0;
}
dev_dbg(&serial->dev->dev, "%s - port number=%d\n ",
__func__, port->number);
}
static int metrousb_port_remove(struct usb_serial_port *port)
{
struct metrousb_private *metro_priv;
metro_priv = usb_get_serial_port_data(port);
kfree(metro_priv);
return 0;
}
@ -414,8 +390,8 @@ static struct usb_serial_driver metrousb_device = {
.close = metrousb_cleanup,
.read_int_callback = metrousb_read_int_callback,
.write_int_callback = metrousb_write_int_callback,
.attach = metrousb_startup,
.release = metrousb_shutdown,
.port_probe = metrousb_port_probe,
.port_remove = metrousb_port_remove,
.throttle = metrousb_throttle,
.unthrottle = metrousb_unthrottle,
.tiocmget = metrousb_tiocmget,