static void userial_cleanup(void)
{
usb_debugfs_remove();
destroy_workqueue(gserial_wq);
tty_unregister_driver(gs_tty_driver);
put_tty_driver(gs_tty_driver);
gs_tty_driver = NULL;
}
/**
* gserial_cleanup - remove TTY-over-USB driver and devices
* Context: may sleep
*
* This is called to free all resources allocated by @gserial_setup().
* Accordingly, it may need to wait until some open /dev/ files have
* closed.
*
* The caller must have issued @gserial_disconnect() for any ports
* that had previously been connected, so that there is never any
* I/O pending when it's called.
*/
void gserial_cleanup(void)
{
unsigned i;
struct gs_port *port;
if (!gs_tty_driver)
return;
/* start sysfs and /dev/ttyGS* node removal */
for (i = 0; i < n_ports; i++)
tty_unregister_device(gs_tty_driver, i);
for (i = 0; i < n_ports; i++) {
/* prevent new opens */
mutex_lock(&ports[i].lock);
port = ports[i].port;
ports[i].port = NULL;
mutex_unlock(&ports[i].lock);
cancel_work_sync(&port->push);
/* wait for old opens to finish */
wait_event(port->close_wait, gs_closed(port));
WARN_ON(port->port_usb != NULL);
kfree(port);
}
n_ports = 0;
usb_debugfs_remove();
destroy_workqueue(gserial_wq);
tty_unregister_driver(gs_tty_driver);
put_tty_driver(gs_tty_driver);
gs_tty_driver = NULL;
pr_debug("%s: cleaned up ttyGS* support\n", __func__);
}
