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USB: mct_u232: switch to generic TIOCMIWAIT implementation 

Switch to the generic TIOCMIWAIT implementation.

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 12:37:13 +01:00 committed by Greg Kroah-Hartman
parent 468c740ee5
commit 128434ab56
1 changed files with 2 additions and 56 deletions
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58
drivers/usb/serial/mct_u232.c
View File

@ -35,7 +35,6 @@
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial.h>
#include <linux/ioctl.h>
#include "mct_u232.h"
#define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
@ -57,8 +56,6 @@ static void mct_u232_break_ctl(struct tty_struct *tty, int break_state);
static int mct_u232_tiocmget(struct tty_struct *tty);
static int mct_u232_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static int mct_u232_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg);
static void mct_u232_throttle(struct tty_struct *tty);
static void mct_u232_unthrottle(struct tty_struct *tty);
@ -93,10 +90,10 @@ static struct usb_serial_driver mct_u232_device = {
.break_ctl = mct_u232_break_ctl,
.tiocmget = mct_u232_tiocmget,
.tiocmset = mct_u232_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.attach = mct_u232_startup,
.port_probe = mct_u232_port_probe,
.port_remove = mct_u232_port_remove,
.ioctl = mct_u232_ioctl,
.get_icount = usb_serial_generic_get_icount,
};
@ -595,7 +592,7 @@ static void mct_u232_read_int_callback(struct urb *urb)
tty_kref_put(tty);
}
#endif
wake_up_interruptible(&port->delta_msr_wait);
wake_up_interruptible(&port->port.delta_msr_wait);
spin_unlock_irqrestore(&priv->lock, flags);
exit:
retval = usb_submit_urb(urb, GFP_ATOMIC);
@ -783,57 +780,6 @@ static void mct_u232_unthrottle(struct tty_struct *tty)
}
}
static int mct_u232_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
DEFINE_WAIT(wait);
struct usb_serial_port *port = tty->driver_data;
struct mct_u232_private *mct_u232_port = usb_get_serial_port_data(port);
struct async_icount cnow, cprev;
unsigned long flags;
dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
switch (cmd) {
case TIOCMIWAIT:
dev_dbg(&port->dev, "%s TIOCMIWAIT", __func__);
spin_lock_irqsave(&mct_u232_port->lock, flags);
cprev = port->icount;
spin_unlock_irqrestore(&mct_u232_port->lock, flags);
for ( ; ; ) {
prepare_to_wait(&port->delta_msr_wait,
&wait, TASK_INTERRUPTIBLE);
schedule();
finish_wait(&port->delta_msr_wait, &wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
if (port->serial->disconnected)
return -EIO;
spin_lock_irqsave(&mct_u232_port->lock, flags);
cnow = port->icount;
spin_unlock_irqrestore(&mct_u232_port->lock, flags);
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;
}
}
return -ENOIOCTLCMD;
}
module_usb_serial_driver(serial_drivers, id_table);
MODULE_AUTHOR(DRIVER_AUTHOR);