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author | Johan Hovold <jhovold@gmail.com> | 2013-03-21 12:37:34 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-25 13:52:28 -0700 |
commit | 6c75e26067c8b8a17aea1bb54b9a8dc9d229c5e8 (patch) | |
tree | 734172d2847952f5c22c294c733cec8e69d3e75f /drivers/usb/serial/ti_usb_3410_5052.c | |
parent | 783ca3557b83b915d1b7a47240e7ab6acca0aac8 (diff) | |
download | op-kernel-dev-6c75e26067c8b8a17aea1bb54b9a8dc9d229c5e8.zip op-kernel-dev-6c75e26067c8b8a17aea1bb54b9a8dc9d229c5e8.tar.gz |
USB: ti_usb_3410_5052: 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.
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>
Diffstat (limited to 'drivers/usb/serial/ti_usb_3410_5052.c')
-rw-r--r-- | drivers/usb/serial/ti_usb_3410_5052.c | 29 |
1 files changed, 3 insertions, 26 deletions
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c index 9997725..0726859 100644 --- a/drivers/usb/serial/ti_usb_3410_5052.c +++ b/drivers/usb/serial/ti_usb_3410_5052.c @@ -232,6 +232,7 @@ static struct usb_serial_driver ti_1port_device = { .set_termios = ti_set_termios, .tiocmget = ti_tiocmget, .tiocmset = ti_tiocmset, + .tiocmiwait = usb_serial_generic_tiocmiwait, .get_icount = usb_serial_generic_get_icount, .break_ctl = ti_break, .read_int_callback = ti_interrupt_callback, @@ -262,6 +263,7 @@ static struct usb_serial_driver ti_2port_device = { .set_termios = ti_set_termios, .tiocmget = ti_tiocmget, .tiocmset = ti_tiocmset, + .tiocmiwait = usb_serial_generic_tiocmiwait, .get_icount = usb_serial_generic_get_icount, .break_ctl = ti_break, .read_int_callback = ti_interrupt_callback, @@ -731,8 +733,6 @@ static int ti_ioctl(struct tty_struct *tty, { struct usb_serial_port *port = tty->driver_data; struct ti_port *tport = 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); @@ -748,29 +748,6 @@ static int ti_ioctl(struct tty_struct *tty, dev_dbg(&port->dev, "%s - TIOCSSERIAL\n", __func__); return ti_set_serial_info(tty, tport, (struct serial_struct __user *)arg); - case TIOCMIWAIT: - dev_dbg(&port->dev, "%s - TIOCMIWAIT\n", __func__); - cprev = port->icount; - while (1) { - interruptible_sleep_on(&port->delta_msr_wait); - if (signal_pending(current)) - return -ERESTARTSYS; - - if (port->serial->disconnected) - return -EIO; - - cnow = port->icount; - 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; - } - break; } return -ENOIOCTLCMD; } @@ -1364,7 +1341,7 @@ static void ti_handle_new_msr(struct ti_port *tport, __u8 msr) icount->dcd++; if (msr & TI_MSR_DELTA_RI) icount->rng++; - wake_up_interruptible(&tport->tp_port->delta_msr_wait); + wake_up_interruptible(&tport->tp_port->port.delta_msr_wait); spin_unlock_irqrestore(&tport->tp_lock, flags); } |