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 <jhov...@gmail.com>
---
drivers/usb/serial/ftdi_sio.c | 39 ++-------------------------------------
1 file changed, 2 insertions(+), 37 deletions(-)
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index e3133e8..478f2b4 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -67,7 +67,6 @@ struct ftdi_private {
*/
int flags; /* some ASYNC_xxxx flags are supported */
unsigned long last_dtr_rts; /* saved modem control outputs */
- wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
char prev_status; /* Used for TIOCMIWAIT */
char transmit_empty; /* If transmitter is empty or not */
__u16 interface; /* FT2232C, FT2232H or FT4232H port interface
@@ -955,6 +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,
@@ -1685,7 +1685,6 @@ static int ftdi_sio_port_probe(struct usb_serial_port
*port)
}
mutex_init(&priv->cfg_lock);
- init_waitqueue_head(&priv->delta_msr_wait);
priv->flags = ASYNC_LOW_LATENCY;
@@ -1826,8 +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_all(&priv->delta_msr_wait);
-
remove_sysfs_attrs(port);
kfree(priv);
@@ -1955,7 +1952,7 @@ static int ftdi_process_packet(struct usb_serial_port
*port,
if (diff_status & FTDI_RS0_RLSD)
port->icount.dcd++;
- wake_up_interruptible_all(&priv->delta_msr_wait);
+ wake_up_interruptible_all(&port->delta_msr_wait);
priv->prev_status = status;
}
@@ -2378,9 +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 ftdi_private *priv = 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);
@@ -2394,35 +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(&priv->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;
--
1.8.1.1
--
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