USB: ti_usb_3410_5052: switch to generic TIOCMIWAIT implementation

Switch to the generic TIOCMIWAIT implementation which does not suffer
from the races involved when using the deprecated sleep_on functions.

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>

diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 9997725383742cea348553707f20ecca76f666c6..07268591b0d1fa7d958736a9fda4d2efa7586cf0 100644 (file)
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -232,6 +232,7 @@ static struct usb_serial_driver ti_1port_device = {
        .set_termios            = ti_set_termios,
        .tiocmget               = ti_tiocmget,
        .tiocmset               = ti_tiocmset,
+       .tiocmiwait             = usb_serial_generic_tiocmiwait,
        .get_icount             = usb_serial_generic_get_icount,
        .break_ctl              = ti_break,
        .read_int_callback      = ti_interrupt_callback,
@@ -262,6 +263,7 @@ static struct usb_serial_driver ti_2port_device = {
        .set_termios            = ti_set_termios,
        .tiocmget               = ti_tiocmget,
        .tiocmset               = ti_tiocmset,
+       .tiocmiwait             = usb_serial_generic_tiocmiwait,
        .get_icount             = usb_serial_generic_get_icount,
        .break_ctl              = ti_break,
        .read_int_callback      = ti_interrupt_callback,
@@ -731,8 +733,6 @@ static int ti_ioctl(struct tty_struct *tty,
 {
        struct usb_serial_port *port = tty->driver_data;
        struct ti_port *tport = usb_get_serial_port_data(port);
-       struct async_icount cnow;
-       struct async_icount cprev;
 
        dev_dbg(&port->dev, "%s - cmd = 0x%04X\n", __func__, cmd);
 
@@ -748,29 +748,6 @@ static int ti_ioctl(struct tty_struct *tty,
                dev_dbg(&port->dev, "%s - TIOCSSERIAL\n", __func__);
                return ti_set_serial_info(tty, tport,
                                (struct serial_struct __user *)arg);
-       case TIOCMIWAIT:
-               dev_dbg(&port->dev, "%s - TIOCMIWAIT\n", __func__);
-               cprev = port->icount;
-               while (1) {
-                       interruptible_sleep_on(&port->delta_msr_wait);
-                       if (signal_pending(current))
-                               return -ERESTARTSYS;
-
-                       if (port->serial->disconnected)
-                               return -EIO;
-
-                       cnow = port->icount;
-                       if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
-                           cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
-                               return -EIO; /* no change => error */
-                       if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
-                           ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
-                           ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
-                           ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)))
-                               return 0;
-                       cprev = cnow;
-               }
-               break;
        }
        return -ENOIOCTLCMD;
 }
@@ -1364,7 +1341,7 @@ static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
                        icount->dcd++;
                if (msr & TI_MSR_DELTA_RI)
                        icount->rng++;
-               wake_up_interruptible(&tport->tp_port->delta_msr_wait);
+               wake_up_interruptible(&tport->tp_port->port.delta_msr_wait);
                spin_unlock_irqrestore(&tport->tp_lock, flags);
        }