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usb-serial: add missing tests and debug lines

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This patch (as1290) adds some missing tests.  serial_down() isn't
supposed to do anything if the hardware hasn't been initialized, and
serial_close() isn't supposed to do anything if the tty has gotten a
hangup (because serial_hangup() takes care of shutting down the
hardware).

The patch also updates and adds a few debugging lines.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2009-09-01 11:39:51 -04:00 committed by Live-CD User
parent 74556123e0
commit ff8324df11
1 changed files with 17 additions and 4 deletions
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21
drivers/usb/serial/usb-serial.c
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@ -200,6 +200,8 @@ static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
struct usb_serial_port *port;
int retval = -ENODEV;
dbg("%s", __func__);
serial = usb_serial_get_by_index(idx);
if (!serial)
return retval;
@ -250,11 +252,11 @@ static int serial_open (struct tty_struct *tty, struct file *filp)
int retval = 0;
int first = 0;
dbg("%s", __func__);
port = tty->driver_data;
serial = port->serial;
dbg("%s - port %d", __func__, port->number);
if (mutex_lock_interruptible(&port->mutex))
return -ERESTARTSYS;
@ -315,6 +317,12 @@ static void serial_down(struct usb_serial_port *port)
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);
serial = port->serial;
owner = serial->type->driver.owner;
@ -328,10 +336,11 @@ static void serial_down(struct usb_serial_port *port)
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);
/* We must not free port yet - the USB serial layer depends on it's
continued existence */
}
static void serial_close(struct tty_struct *tty, struct file *filp)
@ -340,6 +349,8 @@ static void serial_close(struct tty_struct *tty, struct file *filp)
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);
@ -368,6 +379,8 @@ static void serial_release(struct tty_struct *tty)
if (port->console)
return;
dbg("%s - port %d", __func__, port->number);
/* Standard shutdown processing */
tty_shutdown(tty);