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/ti_usb_3410_5052.c | 30 +++---------------------------
1 file changed, 3 insertions(+), 27 deletions(-)
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c
b/drivers/usb/serial/ti_usb_3410_5052.c
index cd19859..ebee7b9 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -73,7 +73,6 @@ struct ti_port {
unsigned int tp_uart_base_addr;
int tp_flags;
int tp_closing_wait;/* in .01 secs */
- wait_queue_head_t tp_msr_wait; /* wait for msr change */
wait_queue_head_t tp_write_wait;
struct ti_device *tp_tdev;
struct usb_serial_port *tp_port;
@@ -233,6 +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,
@@ -263,6 +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,
@@ -429,7 +430,6 @@ static int ti_port_probe(struct usb_serial_port *port)
else
tport->tp_uart_base_addr = TI_UART2_BASE_ADDR;
tport->tp_closing_wait = closing_wait;
- init_waitqueue_head(&tport->tp_msr_wait);
init_waitqueue_head(&tport->tp_write_wait);
if (kfifo_alloc(&tport->write_fifo, TI_WRITE_BUF_SIZE, GFP_KERNEL)) {
kfree(tport);
@@ -449,7 +449,6 @@ static int ti_port_remove(struct usb_serial_port *port)
struct ti_port *tport;
tport = usb_get_serial_port_data(port);
- wake_up_interruptible(&tport->tp_msr_wait);
kfifo_free(&tport->write_fifo);
kfree(tport);
@@ -734,8 +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);
@@ -751,27 +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(&tport->tp_msr_wait);
- 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;
- }
- break;
}
return -ENOIOCTLCMD;
}
@@ -1365,7 +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_msr_wait);
+ wake_up_interruptible(&tport->tp_port->delta_msr_wait);
spin_unlock_irqrestore(&tport->tp_lock, flags);
}
--
1.8.1.1
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