/**
* 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;
#ifdef CONFIG_USB_AUTO_INSTALL
int ret;
#endif
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 */
/*
* port-bridge application will hold one file descriptor to gserial after usb mode switch sometimes
* so wait_event will never get out ,further block kernel thread "suspend" and block console_early_suspend
* which makes the whole system hang.
*/
#ifndef CONFIG_USB_AUTO_INSTALL
wait_event(port->close_wait, gs_closed(port));
#else
ret = wait_event_timeout(port->close_wait, gs_closed(port),HZ/10);
pr_debug("%s timeout %d <\n",__func__,ret);
#endif
WARN_ON(port->port_usb != NULL);
kfree(port);
}
n_ports = 0;
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__);
}
/**
* 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);
tasklet_kill(&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;
tty_unregister_driver(gs_tty_driver);
gs_tty_driver = NULL;
pr_debug("%s: cleaned up ttyGS* support\n", __func__);
}
/**
* 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 */
pr_info("gs_cleanup: unregister tty!\n");
for (i = 0; i < n_ports; i++)
tty_unregister_device(gs_tty_driver, i);
pr_info("gs_cleanup: wait port close!\n");
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);
tasklet_kill(&port->push);
pr_info("gs_cleanup: port%d++\n", i);
/* wait for old opens to finish */
wait_event_timeout(port->close_wait, gs_closed(port), 2*HZ);
if(!gs_closed(port)){
pr_info("%s: port %d still open, forcely close it!\n", __func__, i);
gs_close_forcely(port);
pr_info("%s: wait port %d close event again!\n", __func__, i);
wait_event(port->close_wait, gs_closed(port));
pr_info("%s: wait port %d close event done!\n", __func__, i);
}
pr_info("gs_cleanup: port%d--\n", i);
WARN_ON(port->port_usb != NULL);
kfree(port);
}
n_ports = 0;
tty_unregister_driver(gs_tty_driver);
gs_tty_driver = NULL;
pr_info("%s: cleaned up ttyGS* support\n", __func__);
}
static void gserial_free_port(struct gs_port *port)
{
tasklet_kill(&port->push);
/* wait for old opens to finish */
wait_event(port->port.close_wait, gs_closed(port));
WARN_ON(port->port_usb != NULL);
tty_port_destroy(&port->port);
kfree(port);
}
/**
* 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;
int ret;
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 */
#if 0
wait_event(port->close_wait, gs_closed(port));
#else
ret = wait_event_timeout(port->close_wait, gs_closed(port),HZ/10);
pr_debug("%s timeout %d <\n",__func__,ret);
#endif
WARN_ON(port->port_usb != NULL);
kfree(port);
}
n_ports = 0;
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__);
}
/**
* 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;
#ifdef CONFIG_USB_G_SERIAL_CONSOLE
// unregister_console(&port->port_console);
#endif
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;
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__);
}
void gserial_cleanup(void)
{
unsigned i;
struct gs_port *port;
if (!gs_tty_driver)
return;
for (i = 0; i < n_ports; i++)
tty_unregister_device(gs_tty_driver, i);
for (i = 0; i < n_ports; i++) {
mutex_lock(&ports[i].lock);
port = ports[i].port;
ports[i].port = NULL;
mutex_unlock(&ports[i].lock);
cancel_work_sync(&port->push);
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__);
}