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USB: pl2303: 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.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2014-01-02 22:49:23 +01:00 committed by Greg Kroah-Hartman
parent dbfd2866ac
commit a4bcb29459
1 changed files with 8 additions and 41 deletions
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49
drivers/usb/serial/pl2303.c
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@ -712,46 +712,6 @@ static int pl2303_carrier_raised(struct usb_serial_port *port)
return 0;
}
static int pl2303_tiocmiwait(struct tty_struct *tty, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
struct pl2303_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 pl2303_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
@ -830,7 +790,14 @@ static void pl2303_update_line_status(struct usb_serial_port *port,
usb_serial_handle_break(port);
if (delta & UART_STATE_MSR_MASK) {
if (delta & UART_CTS)
port->icount.cts++;
if (delta & UART_DSR)
port->icount.dsr++;
if (delta & UART_RING)
port->icount.rng++;
if (delta & UART_DCD) {
port->icount.dcd++;
tty = tty_port_tty_get(&port->port);
if (tty) {
usb_serial_handle_dcd_change(port, tty,
@ -950,7 +917,7 @@ static struct usb_serial_driver pl2303_device = {
.set_termios = pl2303_set_termios,
.tiocmget = pl2303_tiocmget,
.tiocmset = pl2303_tiocmset,
.tiocmiwait = pl2303_tiocmiwait,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.process_read_urb = pl2303_process_read_urb,
.read_int_callback = pl2303_read_int_callback,
.probe = pl2303_probe,