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authorAlan Cox <alan@linux.intel.com>2009-10-06 16:06:36 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-11 15:18:04 -0800
commite1108a63e10d344284011cccc06328b2cd3e5da3 (patch)
treef5dc7d7ec62187cd8c808063d1187457ea7ccade /drivers/usb
parentd774a56d2353933cf21cc92a9d0012c7b69d09bf (diff)
downloadlinux-e1108a63e10d344284011cccc06328b2cd3e5da3.tar.bz2
usb_serial: Use the shutdown() operation
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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/serial/usb-serial.c39
1 files changed, 11 insertions, 28 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index b0649d92251f..829a46684e1d 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -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;