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Message-Id: <1357224789-2853-6-git-send-email-jslaby@suse.cz>
Date: Thu, 3 Jan 2013 15:53:05 +0100
From: Jiri Slaby <jslaby@...e.cz>
To: gregkh@...uxfoundation.org
Cc: alan@...ux.intel.com, jirislaby@...il.com,
linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] TTY: move low_latency to tty_port
One point is to have less places where we actually need tty pointer.
The other is that low_latency is bound to buffer processing and
buffers are now in tty_port. So it makes sense to move low_latency to
tty_port too.
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
arch/ia64/hp/sim/simserial.c | 2 +-
arch/mn10300/kernel/mn10300-serial.c | 6 +++---
drivers/char/pcmcia/synclink_cs.c | 2 +-
drivers/isdn/gigaset/interface.c | 2 +-
drivers/net/caif/caif_serial.c | 2 +-
drivers/net/irda/irtty-sir.c | 2 +-
drivers/s390/char/con3215.c | 2 +-
drivers/s390/char/sclp_tty.c | 2 +-
drivers/s390/char/sclp_vt220.c | 2 +-
drivers/s390/char/tty3270.c | 4 ++--
drivers/tty/amiserial.c | 4 ++--
drivers/tty/ipwireless/tty.c | 2 +-
drivers/tty/mxser.c | 2 +-
drivers/tty/serial/cpm_uart/cpm_uart_core.c | 2 +-
drivers/tty/serial/crisv10.c | 4 ++--
drivers/tty/serial/ifx6x60.c | 2 +-
drivers/tty/serial/ioc3_serial.c | 2 +-
drivers/tty/serial/ioc4_serial.c | 2 +-
drivers/tty/serial/max3100.c | 2 +-
drivers/tty/serial/mpsc.c | 2 +-
drivers/tty/serial/mrst_max3110.c | 2 +-
drivers/tty/serial/msm_serial_hs.c | 2 +-
drivers/tty/serial/serial_core.c | 7 +++----
drivers/tty/synclink.c | 2 +-
drivers/tty/synclink_gt.c | 2 +-
drivers/tty/synclinkmp.c | 2 +-
drivers/tty/tty_buffer.c | 9 +++++----
include/linux/tty.h | 5 +++--
net/irda/ircomm/ircomm_tty.c | 2 +-
29 files changed, 42 insertions(+), 41 deletions(-)
diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
index f8ae5d8..942022a 100644
--- a/arch/ia64/hp/sim/simserial.c
+++ b/arch/ia64/hp/sim/simserial.c
@@ -436,7 +436,7 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
struct tty_port *port = &info->port;
tty->driver_data = info;
- tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
/*
* figure out which console to use (should be one already)
diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c
index 54ef40c..ae61bd6 100644
--- a/arch/mn10300/kernel/mn10300-serial.c
+++ b/arch/mn10300/kernel/mn10300-serial.c
@@ -537,7 +537,7 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
count = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE);
count = tty_buffer_request_room(port, count);
if (count == 0) {
- if (!tty->low_latency)
+ if (!port->low_latency)
tty_flip_buffer_push(tty);
return;
}
@@ -546,7 +546,7 @@ try_again:
/* pull chars out of the hat */
ix = ACCESS_ONCE(port->rx_outp);
if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0) {
- if (push && !tty->low_latency)
+ if (push && !port->low_latency)
tty_flip_buffer_push(tty);
return;
}
@@ -678,7 +678,7 @@ insert:
count--;
if (count <= 0) {
- if (!tty->low_latency)
+ if (!port->low_latency)
tty_flip_buffer_push(tty);
return;
}
diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index f125f35..47cbacf 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -2522,7 +2522,7 @@ static int mgslpc_open(struct tty_struct *tty, struct file * filp)
goto cleanup;
}
- tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) {
diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c
index dd2a57e..6dcecd4 100644
--- a/drivers/isdn/gigaset/interface.c
+++ b/drivers/isdn/gigaset/interface.c
@@ -164,7 +164,7 @@ static int if_open(struct tty_struct *tty, struct file *filp)
if (cs->port.count == 1) {
tty_port_tty_set(&cs->port, tty);
- tty->low_latency = 1;
+ cs->port.low_latency = 1;
}
mutex_unlock(&cs->mutex);
diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c
index 5de74e7..666891a 100644
--- a/drivers/net/caif/caif_serial.c
+++ b/drivers/net/caif/caif_serial.c
@@ -91,7 +91,7 @@ static inline void update_tty_status(struct ser_device *ser)
ser->tty->hw_stopped << 4 |
ser->tty->flow_stopped << 3 |
ser->tty->packet << 2 |
- ser->tty->low_latency << 1 |
+ ser->tty->port->low_latency << 1 |
ser->tty->warned;
}
static inline void debugfs_init(struct ser_device *ser, struct tty_struct *tty)
diff --git a/drivers/net/irda/irtty-sir.c b/drivers/net/irda/irtty-sir.c
index 6e4d4b6..a412671 100644
--- a/drivers/net/irda/irtty-sir.c
+++ b/drivers/net/irda/irtty-sir.c
@@ -210,7 +210,7 @@ static int irtty_do_write(struct sir_dev *dev, const unsigned char *ptr, size_t
* been received, which can now be decapsulated and delivered for
* further processing
*
- * calling context depends on underlying driver and tty->low_latency!
+ * calling context depends on underlying driver and tty->port->low_latency!
* for example (low_latency: 1 / 0):
* serial.c: uart-interrupt / softint
* usbserial: urb-complete-interrupt / softint
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index 4c6743d..41b75c5 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -968,7 +968,7 @@ static int tty3215_open(struct tty_struct *tty, struct file * filp)
tty_port_tty_set(&raw->port, tty);
- tty->low_latency = 0; /* don't use bottom half for pushing chars */
+ raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
/*
* Start up 3215 device
*/
diff --git a/drivers/s390/char/sclp_tty.c b/drivers/s390/char/sclp_tty.c
index 3ffddbb..19b7c51 100644
--- a/drivers/s390/char/sclp_tty.c
+++ b/drivers/s390/char/sclp_tty.c
@@ -65,7 +65,7 @@ sclp_tty_open(struct tty_struct *tty, struct file *filp)
{
tty_port_tty_set(&sclp_port, tty);
tty->driver_data = NULL;
- tty->low_latency = 0;
+ sclp_port.low_latency = 0;
return 0;
}
diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c
index b5507f1..0eca99b 100644
--- a/drivers/s390/char/sclp_vt220.c
+++ b/drivers/s390/char/sclp_vt220.c
@@ -495,7 +495,7 @@ sclp_vt220_open(struct tty_struct *tty, struct file *filp)
{
if (tty->count == 1) {
tty_port_tty_set(&sclp_vt220_port, tty);
- tty->low_latency = 0;
+ sclp_vt220_port.low_latency = 0;
if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
tty->winsize.ws_row = 24;
tty->winsize.ws_col = 80;
diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c
index 43ea059..3860e79 100644
--- a/drivers/s390/char/tty3270.c
+++ b/drivers/s390/char/tty3270.c
@@ -860,7 +860,7 @@ static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
tty->driver_data = tp;
tty->winsize.ws_row = tp->view.rows - 2;
tty->winsize.ws_col = tp->view.cols;
- tty->low_latency = 0;
+ tp->port.low_latency = 0;
/* why to reassign? */
tty_port_tty_set(&tp->port, tty);
tp->inattr = TF_INPUT;
@@ -893,7 +893,7 @@ static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
}
tty_port_tty_set(&tp->port, tty);
- tty->low_latency = 0;
+ tp->port.low_latency = 0;
tty->winsize.ws_row = tp->view.rows - 2;
tty->winsize.ws_col = tp->view.cols;
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 2e670d0..2d1357a 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1099,7 +1099,7 @@ static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
state->custom_divisor = new_serial.custom_divisor;
port->close_delay = new_serial.close_delay * HZ/100;
port->closing_wait = new_serial.closing_wait * HZ/100;
- tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
check_and_exit:
if (port->flags & ASYNC_INITIALIZED) {
@@ -1528,7 +1528,7 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
if (serial_paranoia_check(info, tty->name, "rs_open"))
return -ENODEV;
- tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
retval = startup(tty, info);
if (retval) {
diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c
index a3ad5e1..c43da74 100644
--- a/drivers/tty/ipwireless/tty.c
+++ b/drivers/tty/ipwireless/tty.c
@@ -106,7 +106,7 @@ static int ipw_open(struct tty_struct *linux_tty, struct file *filp)
tty->port.tty = linux_tty;
linux_tty->driver_data = tty;
- linux_tty->low_latency = 1;
+ tty->port.low_latency = 1;
if (tty->tty_type == TTYTYPE_MODEM)
ipwireless_ppp_open(tty->network);
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 450c450..e9cdfdf 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -1264,7 +1264,7 @@ static int mxser_set_serial_info(struct tty_struct *tty,
(new_serial.flags & ASYNC_FLAGS));
port->close_delay = new_serial.close_delay * HZ / 100;
port->closing_wait = new_serial.closing_wait * HZ / 100;
- tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
(new_serial.baud_base != info->baud_base ||
new_serial.custom_divisor !=
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index 108122f..0bb2437 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -508,7 +508,7 @@ static void cpm_uart_set_termios(struct uart_port *port,
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
if (baud < HW_BUF_SPD_THRESHOLD ||
- (pinfo->port.state && pinfo->port.state->port.tty->low_latency))
+ (pinfo->port.state && pinfo->port.state->port.low_latency))
pinfo->rx_fifosize = 1;
else
pinfo->rx_fifosize = RX_BUF_SIZE;
diff --git a/drivers/tty/serial/crisv10.c b/drivers/tty/serial/crisv10.c
index c82601d..52449ad 100644
--- a/drivers/tty/serial/crisv10.c
+++ b/drivers/tty/serial/crisv10.c
@@ -3462,7 +3462,7 @@ set_serial_info(struct e100_serial *info,
info->type = new_serial.type;
info->close_delay = new_serial.close_delay;
info->closing_wait = new_serial.closing_wait;
- info->port.tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ info->port.low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
check_and_exit:
if (info->flags & ASYNC_INITIALIZED) {
@@ -4106,7 +4106,7 @@ rs_open(struct tty_struct *tty, struct file * filp)
tty->driver_data = info;
info->port.tty = tty;
- tty->low_latency = !!(info->flags & ASYNC_LOW_LATENCY);
+ info->port.low_latency = !!(info->flags & ASYNC_LOW_LATENCY);
/*
* If the port is in the middle of closing, bail out now
diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c
index bfb634e..4bc6e47 100644
--- a/drivers/tty/serial/ifx6x60.c
+++ b/drivers/tty/serial/ifx6x60.c
@@ -615,7 +615,7 @@ static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty)
tty->driver_data = ifx_dev;
/* allows flip string push from int context */
- tty->low_latency = 1;
+ port->low_latency = 1;
/* set flag to allows data transfer */
set_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags);
diff --git a/drivers/tty/serial/ioc3_serial.c b/drivers/tty/serial/ioc3_serial.c
index 0f25ce4..edbdc4e 100644
--- a/drivers/tty/serial/ioc3_serial.c
+++ b/drivers/tty/serial/ioc3_serial.c
@@ -1000,7 +1000,7 @@ ioc3_change_speed(struct uart_port *the_port,
the_port->ignore_status_mask = N_ALL_INPUT;
- state->port.tty->low_latency = 1;
+ state->port.low_latency = 1;
if (iflag & IGNPAR)
the_port->ignore_status_mask &= ~(N_PARITY_ERROR
diff --git a/drivers/tty/serial/ioc4_serial.c b/drivers/tty/serial/ioc4_serial.c
index 22343da..bd53669 100644
--- a/drivers/tty/serial/ioc4_serial.c
+++ b/drivers/tty/serial/ioc4_serial.c
@@ -1740,7 +1740,7 @@ ioc4_change_speed(struct uart_port *the_port,
the_port->ignore_status_mask = N_ALL_INPUT;
- state->port.tty->low_latency = 1;
+ state->port.low_latency = 1;
if (iflag & IGNPAR)
the_port->ignore_status_mask &= ~(N_PARITY_ERROR
diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
index dd6277e..cdc74bc 100644
--- a/drivers/tty/serial/max3100.c
+++ b/drivers/tty/serial/max3100.c
@@ -529,7 +529,7 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios,
MAX3100_STATUS_OE;
/* we are sending char from a workqueue so enable */
- s->port.state->port.tty->low_latency = 1;
+ s->port.state->port.low_latency = 1;
if (s->poll_time > 0)
del_timer_sync(&s->timer);
diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
index 4bcbc66..6f2d2ce 100644
--- a/drivers/tty/serial/mpsc.c
+++ b/drivers/tty/serial/mpsc.c
@@ -970,7 +970,7 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
#endif
/* Following use of tty struct directly is deprecated */
if (tty_buffer_request_room(port, bytes_in) < bytes_in) {
- if (tty->low_latency)
+ if (port->low_latency)
tty_flip_buffer_push(tty);
/*
* If this failed then we will throw away the bytes
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
index 3b8df7b..4632db7 100644
--- a/drivers/tty/serial/mrst_max3110.c
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -495,7 +495,7 @@ static int serial_m3110_startup(struct uart_port *port)
| WC_BAUD_DR2;
/* as we use thread to handle tx/rx, need set low latency */
- port->state->port.tty->low_latency = 1;
+ port->state->port.low_latency = 1;
if (max->irq) {
max->read_thread = NULL;
diff --git a/drivers/tty/serial/msm_serial_hs.c b/drivers/tty/serial/msm_serial_hs.c
index 11b7f5b..c356fff 100644
--- a/drivers/tty/serial/msm_serial_hs.c
+++ b/drivers/tty/serial/msm_serial_hs.c
@@ -1400,7 +1400,7 @@ static int msm_hs_startup(struct uart_port *uport)
/* do not let tty layer execute RX in global workqueue, use a
* dedicated workqueue managed by this driver */
- uport->state->port.tty->low_latency = 1;
+ uport->state->port.low_latency = 1;
/* turn on uart clk */
ret = msm_hs_init_clk_locked(uport);
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 7805609..da8a025 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -866,9 +866,7 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
port->closing_wait = closing_wait;
if (new_info->xmit_fifo_size)
uport->fifosize = new_info->xmit_fifo_size;
- if (port->tty)
- port->tty->low_latency =
- (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
+ port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
check_and_exit:
retval = 0;
@@ -1564,7 +1562,8 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
*/
tty->driver_data = state;
state->uart_port->state = state;
- tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0;
+ state->port.low_latency =
+ (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0;
tty_port_tty_set(port, tty);
/*
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index b5686b5..a1891ef 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -3416,7 +3416,7 @@ static int mgsl_open(struct tty_struct *tty, struct file * filp)
goto cleanup;
}
- info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) {
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index a0639a0..a7790b5 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -683,7 +683,7 @@ static int open(struct tty_struct *tty, struct file *filp)
}
mutex_lock(&info->port.mutex);
- info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) {
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index 0afabc0..27a29b5 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -762,7 +762,7 @@ static int open(struct tty_struct *tty, struct file *filp)
goto cleanup;
}
- info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) {
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 31873e4..1bfe97a 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -364,7 +364,7 @@ void tty_schedule_flip(struct tty_struct *tty)
{
struct tty_bufhead *buf = &tty->port->buf;
unsigned long flags;
- WARN_ON(tty->low_latency);
+ WARN_ON(tty->port->low_latency);
spin_lock_irqsave(&buf->lock, flags);
if (buf->tail != NULL)
@@ -538,7 +538,7 @@ static void flush_to_ldisc(struct work_struct *work)
*/
void tty_flush_to_ldisc(struct tty_struct *tty)
{
- if (!tty->low_latency)
+ if (!tty->port->low_latency)
flush_work(&tty->port->buf.work);
}
@@ -547,7 +547,8 @@ void tty_flush_to_ldisc(struct tty_struct *tty)
* @tty: tty to push
*
* Queue a push of the terminal flip buffers to the line discipline. This
- * function must not be called from IRQ context if tty->low_latency is set.
+ * function must not be called from IRQ context if port->low_latency is
+ * set.
*
* In the event of the queue being busy for flipping the work will be
* held off and retried later.
@@ -565,7 +566,7 @@ void tty_flip_buffer_push(struct tty_struct *tty)
buf->tail->commit = buf->tail->used;
spin_unlock_irqrestore(&buf->lock, flags);
- if (tty->low_latency)
+ if (tty->port->low_latency)
flush_to_ldisc(&buf->work);
else
schedule_work(&buf->work);
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 8db1b56..f16a47a 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -202,7 +202,8 @@ struct tty_port {
unsigned long iflags; /* TTYP_ internal flags */
#define TTYP_FLUSHING 1 /* Flushing to ldisc in progress */
#define TTYP_FLUSHPENDING 2 /* Queued buffer flush pending */
- unsigned char console:1; /* port is a console */
+ unsigned char console:1, /* port is a console */
+ low_latency:1; /* direct buffer flush */
struct mutex mutex; /* Locking */
struct mutex buf_mutex; /* Buffer alloc lock */
unsigned char *xmit_buf; /* Optional buffer */
@@ -254,7 +255,7 @@ struct tty_struct {
int count;
struct winsize winsize; /* termios mutex */
unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
- unsigned char low_latency:1, warned:1;
+ unsigned char warned:1;
unsigned char ctrl_status; /* ctrl_lock */
unsigned int receive_room; /* Bytes free for queue */
diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
index 14b08e3..2491f6f 100644
--- a/net/irda/ircomm/ircomm_tty.c
+++ b/net/irda/ircomm/ircomm_tty.c
@@ -452,7 +452,7 @@ static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
self->line, self->port.count);
/* Not really used by us, but lets do it anyway */
- tty->low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
/*
* If the port is the middle of closing, bail out now
--
1.8.1
--
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