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usb_serial: Use the shutdown() operation

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As Alan Stern pointed out - now we have tty_port_open the shutdown method
and locking allow us to whack the other bits into the full helper methods
and provide a shutdown op which the tty port code will synchronize with 
setup for us.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2009-10-06 16:06:36 +01:00 committed by Greg Kroah-Hartman
parent d774a56d23
commit e1108a63e1
1 changed files with 11 additions and 28 deletions
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39
drivers/usb/serial/usb-serial.c
View file

@ -254,15 +254,12 @@ static int serial_activate(struct tty_port *tport, struct tty_struct *tty)
struct usb_serial *serial = port->serial;
int retval;
if (mutex_lock_interruptible(&port->mutex))
return -ERESTARTSYS;
mutex_lock(&serial->disc_mutex);
if (serial->disconnected)
retval = -ENODEV;
else
retval = port->serial->type->open(tty, port);
mutex_unlock(&serial->disc_mutex);
mutex_unlock(&port->mutex);
return retval;
}
@ -276,57 +273,40 @@ static int serial_open(struct tty_struct *tty, struct file *filp)
/**
* serial_down - shut down hardware
* @port: port to shut down
* @tport: tty port to shut down
*
* Shut down a USB serial port unless it is the console. We never
* shut down the console hardware as it will always be in use.
* shut down the console hardware as it will always be in use. Serialized
* against activate by the tport mutex and kept to matching open/close pairs
* of calls by the ASYNCB_INITIALIZED flag.
*/
static void serial_down(struct usb_serial_port *port)
static void serial_down(struct tty_port *tport)
{
struct usb_serial_port *port =
container_of(tport, struct usb_serial_port, port);
struct usb_serial_driver *drv = port->serial->type;
/*
* The console is magical. Do not hang up the console hardware
* or there will be tears.
*/
if (port->console)
return;
/* Don't call the close method if the hardware hasn't been
* initialized.
*/
if (!test_and_clear_bit(ASYNCB_INITIALIZED, &port->port.flags))
return;
mutex_lock(&port->mutex);
if (drv->close)
drv->close(port);
mutex_unlock(&port->mutex);
}
static void serial_hangup(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d", __func__, port->number);
serial_down(port);
tty_port_hangup(&port->port);
}
static void serial_close(struct tty_struct *tty, struct file *filp)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d", __func__, port->number);
if (tty_hung_up_p(filp))
return;
if (tty_port_close_start(&port->port, tty, filp) == 0)
return;
serial_down(port);
tty_port_close_end(&port->port, tty);
tty_port_tty_set(&port->port, NULL);
tty_port_close(&port->port, tty, filp);
}
/**
@ -716,6 +696,7 @@ static const struct tty_port_operations serial_port_ops = {
.carrier_raised = serial_carrier_raised,
.dtr_rts = serial_dtr_rts,
.activate = serial_activate,
.shutdown = serial_down,
};
int usb_serial_probe(struct usb_interface *interface,
@ -914,6 +895,8 @@ int usb_serial_probe(struct usb_interface *interface,
port->port.ops = &serial_port_ops;
port->serial = serial;
spin_lock_init(&port->lock);
/* Keep this for private driver use for the moment but
should probably go away */
mutex_init(&port->mutex);
INIT_WORK(&port->work, usb_serial_port_work);
serial->port[i] = port;