tty: Fix various bogus WARN checks in the usb serial layer

We are now refcounted and all the port.count checking is no longer valid
and in fact produces false warnings.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 9c7e1d5..3873660 100644 (file)
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -358,10 +358,6 @@ static int serial_write(struct tty_struct *tty, const unsigned char *buf,
 
        dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
 
-       /* count is managed under the mutex lock for the tty so cannot
-          drop to zero until after the last close completes */
-       WARN_ON(!port->port.count);
-
        /* pass on to the driver specific version of this function */
        retval = port->serial->type->write(tty, port, buf, count);
 
@@ -373,7 +369,6 @@ static int serial_write_room(struct tty_struct *tty)
 {
        struct usb_serial_port *port = tty->driver_data;
        dbg("%s - port %d", __func__, port->number);
-       WARN_ON(!port->port.count);
        /* pass on to the driver specific version of this function */
        return port->serial->type->write_room(tty);
 }
@@ -396,7 +391,6 @@ static void serial_throttle(struct tty_struct *tty)
        struct usb_serial_port *port = tty->driver_data;
        dbg("%s - port %d", __func__, port->number);
 
-       WARN_ON(!port->port.count);
        /* pass on to the driver specific version of this function */
        if (port->serial->type->throttle)
                port->serial->type->throttle(tty);
@@ -407,7 +401,6 @@ static void serial_unthrottle(struct tty_struct *tty)
        struct usb_serial_port *port = tty->driver_data;
        dbg("%s - port %d", __func__, port->number);
 
-       WARN_ON(!port->port.count);
        /* pass on to the driver specific version of this function */
        if (port->serial->type->unthrottle)
                port->serial->type->unthrottle(tty);
@@ -421,8 +414,6 @@ static int serial_ioctl(struct tty_struct *tty, struct file *file,
 
        dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
 
-       WARN_ON(!port->port.count);
-
        /* pass on to the driver specific version of this function
           if it is available */
        if (port->serial->type->ioctl) {
@@ -437,7 +428,6 @@ static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
        struct usb_serial_port *port = tty->driver_data;
        dbg("%s - port %d", __func__, port->number);
 
-       WARN_ON(!port->port.count);
        /* pass on to the driver specific version of this function
           if it is available */
        if (port->serial->type->set_termios)
@@ -452,7 +442,6 @@ static int serial_break(struct tty_struct *tty, int break_state)
 
        dbg("%s - port %d", __func__, port->number);
 
-       WARN_ON(!port->port.count);
        /* pass on to the driver specific version of this function
           if it is available */
        if (port->serial->type->break_ctl)
@@ -513,7 +502,6 @@ static int serial_tiocmget(struct tty_struct *tty, struct file *file)
 
        dbg("%s - port %d", __func__, port->number);
 
-       WARN_ON(!port->port.count);
        if (port->serial->type->tiocmget)
                return port->serial->type->tiocmget(tty, file);
        return -EINVAL;
@@ -526,7 +514,6 @@ static int serial_tiocmset(struct tty_struct *tty, struct file *file,
 
        dbg("%s - port %d", __func__, port->number);
 
-       WARN_ON(!port->port.count);
        if (port->serial->type->tiocmset)
                return port->serial->type->tiocmset(tty, file, set, clear);
        return -EINVAL;