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USB: stop io performed by mos7720 upon close()

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This fixes a problem where the mos7720 driver will make io to a device from
which it has been logically disconnected. It does so by introducing a flag by
which the generic usb serial code can signal the subdrivers their
disconnection and appropriate locking.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum
2008-01-16 17:18:52 +01:00
committed by Greg Kroah-Hartman
parent 828d55c58c
commit a1cd7e99b3
3 changed files with 34 additions and 29 deletions
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28
drivers/usb/serial/usb-serial.c
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@ -634,6 +634,7 @@ static struct usb_serial * create_serial (struct usb_device *dev,
serial->type = driver;
serial->interface = interface;
kref_init(&serial->kref);
mutex_init(&serial->disc_mutex);
return serial;
}
@ -1089,20 +1090,22 @@ void usb_serial_disconnect(struct usb_interface *interface)
usb_serial_console_disconnect(serial);
dbg ("%s", __FUNCTION__);
mutex_lock(&serial->disc_mutex);
usb_set_intfdata (interface, NULL);
if (serial) {
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
if (port) {
if (port->tty)
tty_hangup(port->tty);
kill_traffic(port);
}
/* must set a flag, to signal subdrivers */
serial->disconnected = 1;
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
if (port) {
if (port->tty)
tty_hangup(port->tty);
kill_traffic(port);
}
/* let the last holder of this object
* cause it to be cleaned up */
usb_serial_put(serial);
}
/* let the last holder of this object
* cause it to be cleaned up */
mutex_unlock(&serial->disc_mutex);
usb_serial_put(serial);
dev_info(dev, "device disconnected\n");
}
@ -1112,9 +1115,6 @@ int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
struct usb_serial_port *port;
int i, r = 0;
if (!serial) /* device has been disconnected */
return 0;
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
if (port)