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USB: ftdi_sio: 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.

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 12:36:56 +01:00 committed by Greg Kroah-Hartman
parent cb1676a61a
commit f307e5cd3f
1 changed files with 2 additions and 34 deletions
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36
drivers/usb/serial/ftdi_sio.c
View File

@ -954,6 +954,7 @@ static struct usb_serial_driver ftdi_sio_device = {
.prepare_write_buffer = ftdi_prepare_write_buffer,
.tiocmget = ftdi_tiocmget,
.tiocmset = ftdi_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.get_icount = ftdi_get_icount,
.ioctl = ftdi_ioctl,
.set_termios = ftdi_set_termios,
@ -1824,8 +1825,6 @@ static int ftdi_sio_port_remove(struct usb_serial_port *port)
{
struct ftdi_private *priv = usb_get_serial_port_data(port);
wake_up_interruptible(&port->delta_msr_wait);
remove_sysfs_attrs(port);
kfree(priv);
@ -1953,7 +1952,7 @@ static int ftdi_process_packet(struct usb_serial_port *port,
if (diff_status & FTDI_RS0_RLSD)
port->icount.dcd++;
wake_up_interruptible(&port->delta_msr_wait);
wake_up_interruptible(&port->port.delta_msr_wait);
priv->prev_status = status;
}
@ -2376,8 +2375,6 @@ static int ftdi_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
struct async_icount cnow;
struct async_icount cprev;
dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
@ -2391,35 +2388,6 @@ static int ftdi_ioctl(struct tty_struct *tty,
case TIOCSSERIAL: /* sets serial port data */
return set_serial_info(tty, port,
(struct serial_struct __user *) arg);
/*
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
* - mask passed in arg for lines of interest
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
* Caller should use TIOCGICOUNT to see which one it was.
*
* This code is borrowed from linux/drivers/char/serial.c
*/
case TIOCMIWAIT:
cprev = port->icount;
for (;;) {
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 (((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;
}
case TIOCSERGETLSR:
return get_lsr_info(port, (struct serial_struct __user *)arg);
break;