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__); }