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USB: quatech2: switch to generic TIOCMIWAIT implementation 

Switch to the generic TIOCMIWAIT implementation.

This also fixes the issue with processes waiting for
modem-status-changes not being woken up at disconnect.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-03-21 12:37:23 +01:00 committed by Greg Kroah-Hartman
parent 0a4142fb9c
commit b59597047a
1 changed files with 2 additions and 48 deletions
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50
drivers/usb/serial/quatech2.c
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@ -492,49 +492,6 @@ static int get_serial_info(struct usb_serial_port *port,
return 0;
}
static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
{
struct qt2_port_private *priv = usb_get_serial_port_data(port);
struct async_icount prev, cur;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
prev = port->icount;
spin_unlock_irqrestore(&priv->lock, flags);
while (1) {
wait_event_interruptible(port->delta_msr_wait,
(port->serial->disconnected ||
(port->icount.rng != prev.rng) ||
(port->icount.dsr != prev.dsr) ||
(port->icount.dcd != prev.dcd) ||
(port->icount.cts != prev.cts)));
if (signal_pending(current))
return -ERESTARTSYS;
if (port->serial->disconnected)
return -EIO;
spin_lock_irqsave(&priv->lock, flags);
cur = port->icount;
spin_unlock_irqrestore(&priv->lock, flags);
if ((prev.rng == cur.rng) &&
(prev.dsr == cur.dsr) &&
(prev.dcd == cur.dcd) &&
(prev.cts == cur.cts))
return -EIO;
if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
(arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
(arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
(arg & TIOCM_CTS && (prev.cts != cur.cts)))
return 0;
}
return 0;
}
static int qt2_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
@ -544,10 +501,6 @@ static int qt2_ioctl(struct tty_struct *tty,
case TIOCGSERIAL:
return get_serial_info(port,
(struct serial_struct __user *)arg);
case TIOCMIWAIT:
return wait_modem_info(port, arg);
default:
break;
}
@ -942,7 +895,7 @@ static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
if (newMSR & UART_MSR_TERI)
port->icount.rng++;
wake_up_interruptible(&port->delta_msr_wait);
wake_up_interruptible(&port->port.delta_msr_wait);
}
}
@ -1072,6 +1025,7 @@ static struct usb_serial_driver qt2_device = {
.break_ctl = qt2_break_ctl,
.tiocmget = qt2_tiocmget,
.tiocmset = qt2_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.get_icount = usb_serial_generic_get_icount,
.ioctl = qt2_ioctl,
.set_termios = qt2_set_termios,