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TTY: move low_latency to tty_port

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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@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2013-01-03 15:53:05 +01:00 committed by Greg Kroah-Hartman
parent 05c7cd3990
commit d6c53c0e9b
29 changed files with 42 additions and 41 deletions
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2
arch/ia64/hp/sim/simserial.c
View File

@ -436,7 +436,7 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
struct tty_port *port = &info->port; struct tty_port *port = &info->port;
tty->driver_data = info; 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) * figure out which console to use (should be one already)

6
arch/mn10300/kernel/mn10300-serial.c
View File

@ -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 = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE);
count = tty_buffer_request_room(port, count); count = tty_buffer_request_room(port, count);
if (count == 0) { if (count == 0) {
if (!tty->low_latency) if (!port->low_latency)
tty_flip_buffer_push(tty); tty_flip_buffer_push(tty);
return; return;
} }
@ -546,7 +546,7 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
/* pull chars out of the hat */ /* pull chars out of the hat */
ix = ACCESS_ONCE(port->rx_outp); ix = ACCESS_ONCE(port->rx_outp);
if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0) { 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); tty_flip_buffer_push(tty);
return; return;
} }
@ -678,7 +678,7 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
count--; count--;
if (count <= 0) { if (count <= 0) {
if (!tty->low_latency) if (!port->low_latency)
tty_flip_buffer_push(tty); tty_flip_buffer_push(tty);
return; return;
} }

2
drivers/char/pcmcia/synclink_cs.c
View File

@ -2522,7 +2522,7 @@ static int mgslpc_open(struct tty_struct *tty, struct file * filp)
goto cleanup; 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); spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) { if (info->netcount) {

2
drivers/isdn/gigaset/interface.c
View File

@ -164,7 +164,7 @@ static int if_open(struct tty_struct *tty, struct file *filp)
if (cs->port.count == 1) { if (cs->port.count == 1) {
tty_port_tty_set(&cs->port, tty); tty_port_tty_set(&cs->port, tty);
tty->low_latency = 1; cs->port.low_latency = 1;
} }
mutex_unlock(&cs->mutex); mutex_unlock(&cs->mutex);

2
drivers/net/caif/caif_serial.c
View File

@ -91,7 +91,7 @@ static inline void update_tty_status(struct ser_device *ser)
ser->tty->hw_stopped << 4 | ser->tty->hw_stopped << 4 |
ser->tty->flow_stopped << 3 | ser->tty->flow_stopped << 3 |
ser->tty->packet << 2 | ser->tty->packet << 2 |
ser->tty->low_latency << 1 | ser->tty->port->low_latency << 1 |
ser->tty->warned; ser->tty->warned;
} }
static inline void debugfs_init(struct ser_device *ser, struct tty_struct *tty) static inline void debugfs_init(struct ser_device *ser, struct tty_struct *tty)

2
drivers/net/irda/irtty-sir.c
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@ -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 * been received, which can now be decapsulated and delivered for
* further processing * 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): * for example (low_latency: 1 / 0):
* serial.c: uart-interrupt / softint * serial.c: uart-interrupt / softint
* usbserial: urb-complete-interrupt / softint * usbserial: urb-complete-interrupt / softint

2
drivers/s390/char/con3215.c
View File

@ -968,7 +968,7 @@ static int tty3215_open(struct tty_struct *tty, struct file * filp)
tty_port_tty_set(&raw->port, tty); 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 * Start up 3215 device
*/ */

2
drivers/s390/char/sclp_tty.c
View File

@ -65,7 +65,7 @@ sclp_tty_open(struct tty_struct *tty, struct file *filp)
{ {
tty_port_tty_set(&sclp_port, tty); tty_port_tty_set(&sclp_port, tty);
tty->driver_data = NULL; tty->driver_data = NULL;
tty->low_latency = 0; sclp_port.low_latency = 0;
return 0; return 0;
} }

2
drivers/s390/char/sclp_vt220.c
View File

@ -495,7 +495,7 @@ sclp_vt220_open(struct tty_struct *tty, struct file *filp)
{ {
if (tty->count == 1) { if (tty->count == 1) {
tty_port_tty_set(&sclp_vt220_port, tty); 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) { if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
tty->winsize.ws_row = 24; tty->winsize.ws_row = 24;
tty->winsize.ws_col = 80; tty->winsize.ws_col = 80;

4
drivers/s390/char/tty3270.c
View File

@ -860,7 +860,7 @@ static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
tty->driver_data = tp; tty->driver_data = tp;
tty->winsize.ws_row = tp->view.rows - 2; tty->winsize.ws_row = tp->view.rows - 2;
tty->winsize.ws_col = tp->view.cols; tty->winsize.ws_col = tp->view.cols;
tty->low_latency = 0; tp->port.low_latency = 0;
/* why to reassign? */ /* why to reassign? */
tty_port_tty_set(&tp->port, tty); tty_port_tty_set(&tp->port, tty);
tp->inattr = TF_INPUT; 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_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_row = tp->view.rows - 2;
tty->winsize.ws_col = tp->view.cols; tty->winsize.ws_col = tp->view.cols;

4
drivers/tty/amiserial.c
View File

@ -1099,7 +1099,7 @@ static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
state->custom_divisor = new_serial.custom_divisor; state->custom_divisor = new_serial.custom_divisor;
port->close_delay = new_serial.close_delay * HZ/100; port->close_delay = new_serial.close_delay * HZ/100;
port->closing_wait = new_serial.closing_wait * 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: check_and_exit:
if (port->flags & ASYNC_INITIALIZED) { 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")) if (serial_paranoia_check(info, tty->name, "rs_open"))
return -ENODEV; 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); retval = startup(tty, info);
if (retval) { if (retval) {

2
drivers/tty/ipwireless/tty.c
View File

@ -106,7 +106,7 @@ static int ipw_open(struct tty_struct *linux_tty, struct file *filp)
tty->port.tty = linux_tty; tty->port.tty = linux_tty;
linux_tty->driver_data = tty; linux_tty->driver_data = tty;
linux_tty->low_latency = 1; tty->port.low_latency = 1;
if (tty->tty_type == TTYTYPE_MODEM) if (tty->tty_type == TTYTYPE_MODEM)
ipwireless_ppp_open(tty->network); ipwireless_ppp_open(tty->network);

2
drivers/tty/mxser.c
View File

@ -1264,7 +1264,7 @@ static int mxser_set_serial_info(struct tty_struct *tty,
(new_serial.flags & ASYNC_FLAGS)); (new_serial.flags & ASYNC_FLAGS));
port->close_delay = new_serial.close_delay * HZ / 100; port->close_delay = new_serial.close_delay * HZ / 100;
port->closing_wait = new_serial.closing_wait * 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 && if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
(new_serial.baud_base != info->baud_base || (new_serial.baud_base != info->baud_base ||
new_serial.custom_divisor != new_serial.custom_divisor !=

2
drivers/tty/serial/cpm_uart/cpm_uart_core.c
View File

@ -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); baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
if (baud < HW_BUF_SPD_THRESHOLD || 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; pinfo->rx_fifosize = 1;
else else
pinfo->rx_fifosize = RX_BUF_SIZE; pinfo->rx_fifosize = RX_BUF_SIZE;

4
drivers/tty/serial/crisv10.c
View File

@ -3462,7 +3462,7 @@ set_serial_info(struct e100_serial *info,
info->type = new_serial.type; info->type = new_serial.type;
info->close_delay = new_serial.close_delay; info->close_delay = new_serial.close_delay;
info->closing_wait = new_serial.closing_wait; 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: check_and_exit:
if (info->flags & ASYNC_INITIALIZED) { if (info->flags & ASYNC_INITIALIZED) {
@ -4106,7 +4106,7 @@ rs_open(struct tty_struct *tty, struct file * filp)
tty->driver_data = info; tty->driver_data = info;
info->port.tty = tty; 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 * If the port is in the middle of closing, bail out now

2
drivers/tty/serial/ifx6x60.c
View File

@ -615,7 +615,7 @@ static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty)
tty->driver_data = ifx_dev; tty->driver_data = ifx_dev;
/* allows flip string push from int context */ /* allows flip string push from int context */
tty->low_latency = 1; port->low_latency = 1;
/* set flag to allows data transfer */ /* set flag to allows data transfer */
set_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags); set_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags);

2
drivers/tty/serial/ioc3_serial.c
View File

@ -1000,7 +1000,7 @@ ioc3_change_speed(struct uart_port *the_port,
the_port->ignore_status_mask = N_ALL_INPUT; the_port->ignore_status_mask = N_ALL_INPUT;
state->port.tty->low_latency = 1; state->port.low_latency = 1;
if (iflag & IGNPAR) if (iflag & IGNPAR)
the_port->ignore_status_mask &= ~(N_PARITY_ERROR the_port->ignore_status_mask &= ~(N_PARITY_ERROR

2
drivers/tty/serial/ioc4_serial.c
View File

@ -1740,7 +1740,7 @@ ioc4_change_speed(struct uart_port *the_port,
the_port->ignore_status_mask = N_ALL_INPUT; the_port->ignore_status_mask = N_ALL_INPUT;
state->port.tty->low_latency = 1; state->port.low_latency = 1;
if (iflag & IGNPAR) if (iflag & IGNPAR)
the_port->ignore_status_mask &= ~(N_PARITY_ERROR the_port->ignore_status_mask &= ~(N_PARITY_ERROR

2
drivers/tty/serial/max3100.c
View File

@ -530,7 +530,7 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios,
MAX3100_STATUS_OE; MAX3100_STATUS_OE;
/* we are sending char from a workqueue so enable */ /* 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) if (s->poll_time > 0)
del_timer_sync(&s->timer); del_timer_sync(&s->timer);

2
drivers/tty/serial/mpsc.c
View File

@ -970,7 +970,7 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
#endif #endif
/* Following use of tty struct directly is deprecated */ /* Following use of tty struct directly is deprecated */
if (tty_buffer_request_room(port, bytes_in) < bytes_in) { if (tty_buffer_request_room(port, bytes_in) < bytes_in) {
if (tty->low_latency) if (port->low_latency)
tty_flip_buffer_push(tty); tty_flip_buffer_push(tty);
/* /*
* If this failed then we will throw away the bytes * If this failed then we will throw away the bytes

2
drivers/tty/serial/mrst_max3110.c
View File

@ -495,7 +495,7 @@ static int serial_m3110_startup(struct uart_port *port)
| WC_BAUD_DR2; | WC_BAUD_DR2;
/* as we use thread to handle tx/rx, need set low latency */ /* 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) { if (max->irq) {
max->read_thread = NULL; max->read_thread = NULL;

2
drivers/tty/serial/msm_serial_hs.c
View File

@ -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 /* do not let tty layer execute RX in global workqueue, use a
* dedicated workqueue managed by this driver */ * dedicated workqueue managed by this driver */
uport->state->port.tty->low_latency = 1; uport->state->port.low_latency = 1;
/* turn on uart clk */ /* turn on uart clk */
ret = msm_hs_init_clk_locked(uport); ret = msm_hs_init_clk_locked(uport);

7
drivers/tty/serial/serial_core.c
View File

@ -867,9 +867,7 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
port->closing_wait = closing_wait; port->closing_wait = closing_wait;
if (new_info->xmit_fifo_size) if (new_info->xmit_fifo_size)
uport->fifosize = new_info->xmit_fifo_size; uport->fifosize = new_info->xmit_fifo_size;
if (port->tty) port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
port->tty->low_latency =
(uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
check_and_exit: check_and_exit:
retval = 0; retval = 0;
@ -1565,7 +1563,8 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
*/ */
tty->driver_data = state; tty->driver_data = state;
state->uart_port->state = 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); tty_port_tty_set(port, tty);
/* /*

2
drivers/tty/synclink.c
View File

@ -3415,7 +3415,7 @@ static int mgsl_open(struct tty_struct *tty, struct file * filp)
goto cleanup; 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); spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) { if (info->netcount) {

2
drivers/tty/synclink_gt.c
View File

@ -682,7 +682,7 @@ static int open(struct tty_struct *tty, struct file *filp)
} }
mutex_lock(&info->port.mutex); 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); spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) { if (info->netcount) {

2
drivers/tty/synclinkmp.c
View File

@ -761,7 +761,7 @@ static int open(struct tty_struct *tty, struct file *filp)
goto cleanup; 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); spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) { if (info->netcount) {

9
drivers/tty/tty_buffer.c
View File

@ -364,7 +364,7 @@ void tty_schedule_flip(struct tty_struct *tty)
{ {
struct tty_bufhead *buf = &tty->port->buf; struct tty_bufhead *buf = &tty->port->buf;
unsigned long flags; unsigned long flags;
WARN_ON(tty->low_latency); WARN_ON(tty->port->low_latency);
spin_lock_irqsave(&buf->lock, flags); spin_lock_irqsave(&buf->lock, flags);
if (buf->tail != NULL) 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) void tty_flush_to_ldisc(struct tty_struct *tty)
{ {
if (!tty->low_latency) if (!tty->port->low_latency)
flush_work(&tty->port->buf.work); flush_work(&tty->port->buf.work);
} }
@ -547,7 +547,8 @@ void tty_flush_to_ldisc(struct tty_struct *tty)
* @tty: tty to push * @tty: tty to push
* *
* Queue a push of the terminal flip buffers to the line discipline. This * 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 * In the event of the queue being busy for flipping the work will be
* held off and retried later. * held off and retried later.
@ -565,7 +566,7 @@ void tty_flip_buffer_push(struct tty_struct *tty)
buf->tail->commit = buf->tail->used; buf->tail->commit = buf->tail->used;
spin_unlock_irqrestore(&buf->lock, flags); spin_unlock_irqrestore(&buf->lock, flags);
if (tty->low_latency) if (tty->port->low_latency)
flush_to_ldisc(&buf->work); flush_to_ldisc(&buf->work);
else else
schedule_work(&buf->work); schedule_work(&buf->work);

5
include/linux/tty.h
View File

@ -202,7 +202,8 @@ struct tty_port {
unsigned long iflags; /* TTYP_ internal flags */ unsigned long iflags; /* TTYP_ internal flags */
#define TTYP_FLUSHING 1 /* Flushing to ldisc in progress */ #define TTYP_FLUSHING 1 /* Flushing to ldisc in progress */
#define TTYP_FLUSHPENDING 2 /* Queued buffer flush pending */ #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 mutex; /* Locking */
struct mutex buf_mutex; /* Buffer alloc lock */ struct mutex buf_mutex; /* Buffer alloc lock */
unsigned char *xmit_buf; /* Optional buffer */ unsigned char *xmit_buf; /* Optional buffer */
@ -254,7 +255,7 @@ struct tty_struct {
int count; int count;
struct winsize winsize; /* termios mutex */ struct winsize winsize; /* termios mutex */
unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1; 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 char ctrl_status; /* ctrl_lock */
unsigned int receive_room; /* Bytes free for queue */ unsigned int receive_room; /* Bytes free for queue */

2
net/irda/ircomm/ircomm_tty.c
View File

@ -452,7 +452,7 @@ static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
self->line, self->port.count); self->line, self->port.count);
/* Not really used by us, but lets do it anyway */ /* 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 * If the port is the middle of closing, bail out now