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USB: io_ti: switch to generic TIOCMIWAIT implementation

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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>
This commit is contained in:
Johan Hovold 2013-03-21 12:37:10 +01:00 committed by Greg Kroah-Hartman
parent cf9a9d66bd
commit 48ee580138
1 changed files with 4 additions and 30 deletions
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34
drivers/usb/serial/io_ti.c
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@ -86,6 +86,7 @@ struct edgeport_port {
int baud_rate;
int close_pending;
int lsr_event;
struct edgeport_serial *edge_serial;
struct usb_serial_port *port;
__u8 bUartMode; /* Port type, 0: RS232, etc. */
@ -1455,7 +1456,7 @@ static void handle_new_msr(struct edgeport_port *edge_port, __u8 msr)
icount->dcd++;
if (msr & EDGEPORT_MSR_DELTA_RI)
icount->rng++;
wake_up_interruptible(&edge_port->port->delta_msr_wait);
wake_up_interruptible(&edge_port->port->port.delta_msr_wait);
}
/* Save the new modem status */
@ -2392,8 +2393,6 @@ static int edge_ioctl(struct tty_struct *tty,
{
struct usb_serial_port *port = tty->driver_data;
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
struct async_icount cnow;
struct async_icount cprev;
dev_dbg(&port->dev, "%s - port %d, cmd = 0x%x\n", __func__, port->number, cmd);
@ -2402,32 +2401,6 @@ static int edge_ioctl(struct tty_struct *tty,
dev_dbg(&port->dev, "%s - TIOCGSERIAL\n", __func__);
return get_serial_info(edge_port,
(struct serial_struct __user *) arg);
case TIOCMIWAIT:
dev_dbg(&port->dev, "%s - TIOCMIWAIT\n", __func__);
cprev = edge_port->port->icount;
while (1) {
interruptible_sleep_on(&port->delta_msr_wait);
/* see if a signal did it */
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;
}
/* not reached */
break;
}
return -ENOIOCTLCMD;
}
@ -2522,7 +2495,6 @@ static int edge_port_remove(struct usb_serial_port *port)
struct edgeport_port *edge_port;
edge_port = usb_get_serial_port_data(port);
edge_remove_sysfs_attrs(port);
kfifo_free(&edge_port->write_fifo);
kfree(edge_port);
@ -2594,6 +2566,7 @@ static struct usb_serial_driver edgeport_1port_device = {
.set_termios = edge_set_termios,
.tiocmget = edge_tiocmget,
.tiocmset = edge_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.get_icount = usb_serial_generic_get_icount,
.write = edge_write,
.write_room = edge_write_room,
@ -2625,6 +2598,7 @@ static struct usb_serial_driver edgeport_2port_device = {
.set_termios = edge_set_termios,
.tiocmget = edge_tiocmget,
.tiocmset = edge_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.get_icount = usb_serial_generic_get_icount,
.write = edge_write,
.write_room = edge_write_room,