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>
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 9e1a013..bfc5ce0 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -1521,19 +1521,16 @@
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 @@
.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,