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USB: usb-serial: call port_probe and port_remove at the right times

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This patch (as1253) prevents the usb-serial core from calling a
driver's port_probe and port_remove methods more than once per port.
It also removes some unnecessary try_module_get() calls and adds a
missing port_remove method call in a failure path.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2009-06-02 11:54:11 -04:00
committed by Greg Kroah-Hartman
parent c6994e6f06
commit c706ebdfc8
3 changed files with 41 additions and 18 deletions
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24
drivers/usb/serial/usb-serial.c
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@ -1046,10 +1046,15 @@ int usb_serial_probe(struct usb_interface *interface,
dev_set_name(&port->dev, "ttyUSB%d", port->number);
dbg ("%s - registering %s", __func__, dev_name(&port->dev));
port->dev_state = PORT_REGISTERING;
retval = device_register(&port->dev);
if (retval)
if (retval) {
dev_err(&port->dev, "Error registering port device, "
"continuing\n");
port->dev_state = PORT_UNREGISTERED;
} else {
port->dev_state = PORT_REGISTERED;
}
}
usb_serial_console_init(debug, minor);
@ -1130,7 +1135,22 @@ void usb_serial_disconnect(struct usb_interface *interface)
}
kill_traffic(port);
cancel_work_sync(&port->work);
device_del(&port->dev);
if (port->dev_state == PORT_REGISTERED) {
/* Make sure the port is bound so that the
* driver's port_remove method is called.
*/
if (!port->dev.driver) {
int rc;
port->dev.driver =
&serial->type->driver;
rc = device_bind_driver(&port->dev);
}
port->dev_state = PORT_UNREGISTERING;
device_del(&port->dev);
port->dev_state = PORT_UNREGISTERED;
}
}
}
serial->type->shutdown(serial);