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USB: f81232: switch to generic tiocmiwait

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Switch to generic tiocmiwait rather than rely on a custom implementation
using racy interruptible_sleep_on().

Note that this driver is mostly stubbed out so neither version of
tiocmiwait will actually work until someone implements
f81232_update_line_status().

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-12-29 19:22:58 +01:00 committed by Greg Kroah-Hartman
parent 49fabf2986
commit c50db82dca
1 changed files with 2 additions and 42 deletions
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44
drivers/usb/serial/f81232.c
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@ -56,7 +56,7 @@ static void f81232_update_line_status(struct usb_serial_port *port,
unsigned int actual_length)
{
/*
* FIXME: Call
* FIXME: Update port->icount, and call
*
* wake_up_interruptible(&port->port.delta_msr_wait);
*
@ -247,46 +247,6 @@ static int f81232_carrier_raised(struct usb_serial_port *port)
return 0;
}
static int f81232_tiocmiwait(struct tty_struct *tty, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
struct f81232_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int prevstatus;
unsigned int status;
unsigned int changed;
spin_lock_irqsave(&priv->lock, flags);
prevstatus = priv->line_status;
spin_unlock_irqrestore(&priv->lock, flags);
while (1) {
interruptible_sleep_on(&port->port.delta_msr_wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
if (port->serial->disconnected)
return -EIO;
spin_lock_irqsave(&priv->lock, flags);
status = priv->line_status;
spin_unlock_irqrestore(&priv->lock, flags);
changed = prevstatus ^ status;
if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
((arg & TIOCM_CD) && (changed & UART_DCD)) ||
((arg & TIOCM_CTS) && (changed & UART_CTS))) {
return 0;
}
prevstatus = status;
}
/* NOTREACHED */
return 0;
}
static int f81232_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
@ -356,7 +316,7 @@ static struct usb_serial_driver f81232_device = {
.set_termios = f81232_set_termios,
.tiocmget = f81232_tiocmget,
.tiocmset = f81232_tiocmset,
.tiocmiwait = f81232_tiocmiwait,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.process_read_urb = f81232_process_read_urb,
.read_int_callback = f81232_read_int_callback,
.port_probe = f81232_port_probe,