mxser: use tty_port

Switch mxser to use the new tty_port structure

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index 4b81a85c5b53d1002252514b9e95c3cc60c0bb43..e83ccee03161fd0e83fe7ce4d1f3e4f6e5cac6b2 100644 (file)
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -222,8 +222,8 @@ struct mxser_mon_ext {
 struct mxser_board;
 
 struct mxser_port {
+       struct tty_port port;
        struct mxser_board *board;
-       struct tty_struct *tty;
 
        unsigned long ioaddr;
        unsigned long opmode_ioaddr;
@@ -234,7 +234,6 @@ struct mxser_port {
        int rx_low_water;
        int baud_base;          /* max. speed */
        int type;               /* UART type */
-       int flags;              /* defined in tty.h */
 
        int x_char;             /* xon/xoff character */
        int IER;                /* Interrupt Enable Register */
@@ -249,15 +248,12 @@ struct mxser_port {
        unsigned char err_shadow;
        unsigned long event;
 
-       int count;              /* # of fd on device */
-       int blocked_open;       /* # of blocked opens */
        struct async_icount icount; /* kernel counters for 4 input interrupts */
        int timeout;
 
        int read_status_mask;
        int ignore_status_mask;
        int xmit_fifo_size;
-       unsigned char *xmit_buf;
        int xmit_head;
        int xmit_tail;
        int xmit_cnt;
@@ -267,7 +263,6 @@ struct mxser_port {
        struct mxser_mon mon_data;
 
        spinlock_t slock;
-       wait_queue_head_t open_wait;
        wait_queue_head_t delta_msr_wait;
 };
 
@@ -575,7 +570,7 @@ static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
         */
        if ((filp->f_flags & O_NONBLOCK) ||
                        test_bit(TTY_IO_ERROR, &tty->flags)) {
-               port->flags |= ASYNC_NORMAL_ACTIVE;
+               port->port.flags |= ASYNC_NORMAL_ACTIVE;
                return 0;
        }
 
@@ -585,32 +580,32 @@ static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
        /*
         * Block waiting for the carrier detect and the line to become
         * free (i.e., not in use by the callout).  While we are in
-        * this loop, port->count is dropped by one, so that
+        * this loop, port->port.count is dropped by one, so that
         * mxser_close() knows when to free things.  We restore it upon
         * exit, either normal or abnormal.
         */
        retval = 0;
-       add_wait_queue(&port->open_wait, &wait);
+       add_wait_queue(&port->port.open_wait, &wait);
 
        spin_lock_irqsave(&port->slock, flags);
        if (!tty_hung_up_p(filp))
-               port->count--;
+               port->port.count--;
        spin_unlock_irqrestore(&port->slock, flags);
-       port->blocked_open++;
+       port->port.blocked_open++;
        while (1) {
                spin_lock_irqsave(&port->slock, flags);
                outb(inb(port->ioaddr + UART_MCR) |
                        UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
                spin_unlock_irqrestore(&port->slock, flags);
                set_current_state(TASK_INTERRUPTIBLE);
-               if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
-                       if (port->flags & ASYNC_HUP_NOTIFY)
+               if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
+                       if (port->port.flags & ASYNC_HUP_NOTIFY)
                                retval = -EAGAIN;
                        else
                                retval = -ERESTARTSYS;
                        break;
                }
-               if (!(port->flags & ASYNC_CLOSING) &&
+               if (!(port->port.flags & ASYNC_CLOSING) &&
                                (do_clocal ||
                                (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
                        break;
@@ -621,13 +616,13 @@ static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
                schedule();
        }
        set_current_state(TASK_RUNNING);
-       remove_wait_queue(&port->open_wait, &wait);
+       remove_wait_queue(&port->port.open_wait, &wait);
        if (!tty_hung_up_p(filp))
-               port->count++;
-       port->blocked_open--;
+               port->port.count++;
+       port->port.blocked_open--;
        if (retval)
                return retval;
-       port->flags |= ASYNC_NORMAL_ACTIVE;
+       port->port.flags |= ASYNC_NORMAL_ACTIVE;
        return 0;
 }
 
@@ -636,7 +631,7 @@ static int mxser_set_baud(struct mxser_port *info, long newspd)
        int quot = 0, baud;
        unsigned char cval;
 
-       if (!info->tty || !info->tty->termios)
+       if (!info->port.tty || !info->port.tty->termios)
                return -1;
 
        if (!(info->ioaddr))
@@ -647,13 +642,13 @@ static int mxser_set_baud(struct mxser_port *info, long newspd)
 
        if (newspd == 134) {
                quot = 2 * info->baud_base / 269;
-               tty_encode_baud_rate(info->tty, 134, 134);
+               tty_encode_baud_rate(info->port.tty, 134, 134);
        } else if (newspd) {
                quot = info->baud_base / newspd;
                if (quot == 0)
                        quot = 1;
                baud = info->baud_base/quot;
-               tty_encode_baud_rate(info->tty, baud, baud);
+               tty_encode_baud_rate(info->port.tty, baud, baud);
        } else {
                quot = 0;
        }
@@ -679,7 +674,7 @@ static int mxser_set_baud(struct mxser_port *info, long newspd)
        outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 
 #ifdef BOTHER
-       if (C_BAUD(info->tty) == BOTHER) {
+       if (C_BAUD(info->port.tty) == BOTHER) {
                quot = info->baud_base % newspd;
                quot *= 8;
                if (quot % newspd > newspd / 2) {
@@ -707,14 +702,14 @@ static int mxser_change_speed(struct mxser_port *info,
        int ret = 0;
        unsigned char status;
 
-       if (!info->tty || !info->tty->termios)
+       if (!info->port.tty || !info->port.tty->termios)
                return ret;
-       cflag = info->tty->termios->c_cflag;
+       cflag = info->port.tty->termios->c_cflag;
        if (!(info->ioaddr))
                return ret;
 
-       if (mxser_set_baud_method[info->tty->index] == 0)
-               mxser_set_baud(info, tty_get_baud_rate(info->tty));
+       if (mxser_set_baud_method[info->port.tty->index] == 0)
+               mxser_set_baud(info, tty_get_baud_rate(info->port.tty));
 
        /* byte size and parity */
        switch (cflag & CSIZE) {
@@ -777,15 +772,15 @@ static int mxser_change_speed(struct mxser_port *info,
        info->IER &= ~UART_IER_MSI;
        info->MCR &= ~UART_MCR_AFE;
        if (cflag & CRTSCTS) {
-               info->flags |= ASYNC_CTS_FLOW;
+               info->port.flags |= ASYNC_CTS_FLOW;
                info->IER |= UART_IER_MSI;
                if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
                        info->MCR |= UART_MCR_AFE;
                } else {
                        status = inb(info->ioaddr + UART_MSR);
-                       if (info->tty->hw_stopped) {
+                       if (info->port.tty->hw_stopped) {
                                if (status & UART_MSR_CTS) {
-                                       info->tty->hw_stopped = 0;
+                                       info->port.tty->hw_stopped = 0;
                                        if (info->type != PORT_16550A &&
                                                        !info->board->chip_flag) {
                                                outb(info->IER & ~UART_IER_THRI,
@@ -795,11 +790,11 @@ static int mxser_change_speed(struct mxser_port *info,
                                                outb(info->IER, info->ioaddr +
                                                                UART_IER);
                                        }
-                                       tty_wakeup(info->tty);
+                                       tty_wakeup(info->port.tty);
                                }
                        } else {
                                if (!(status & UART_MSR_CTS)) {
-                                       info->tty->hw_stopped = 1;
+                                       info->port.tty->hw_stopped = 1;
                                        if ((info->type != PORT_16550A) &&
                                                        (!info->board->chip_flag)) {
                                                info->IER &= ~UART_IER_THRI;
@@ -810,13 +805,13 @@ static int mxser_change_speed(struct mxser_port *info,
                        }
                }
        } else {
-               info->flags &= ~ASYNC_CTS_FLOW;
+               info->port.flags &= ~ASYNC_CTS_FLOW;
        }
        outb(info->MCR, info->ioaddr + UART_MCR);
        if (cflag & CLOCAL) {
-               info->flags &= ~ASYNC_CHECK_CD;
+               info->port.flags &= ~ASYNC_CHECK_CD;
        } else {
-               info->flags |= ASYNC_CHECK_CD;
+               info->port.flags |= ASYNC_CHECK_CD;
                info->IER |= UART_IER_MSI;
        }
        outb(info->IER, info->ioaddr + UART_IER);
@@ -825,21 +820,21 @@ static int mxser_change_speed(struct mxser_port *info,
         * Set up parity check flag
         */
        info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
-       if (I_INPCK(info->tty))
+       if (I_INPCK(info->port.tty))
                info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
-       if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
+       if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
                info->read_status_mask |= UART_LSR_BI;
 
        info->ignore_status_mask = 0;
 
-       if (I_IGNBRK(info->tty)) {
+       if (I_IGNBRK(info->port.tty)) {
                info->ignore_status_mask |= UART_LSR_BI;
                info->read_status_mask |= UART_LSR_BI;
                /*
                 * If we're ignore parity and break indicators, ignore
                 * overruns too.  (For real raw support).
                 */
-               if (I_IGNPAR(info->tty)) {
+               if (I_IGNPAR(info->port.tty)) {
                        info->ignore_status_mask |=
                                                UART_LSR_OE |
                                                UART_LSR_PE |
@@ -851,16 +846,16 @@ static int mxser_change_speed(struct mxser_port *info,
                }
        }
        if (info->board->chip_flag) {
-               mxser_set_must_xon1_value(info->ioaddr, START_CHAR(info->tty));
-               mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(info->tty));
-               if (I_IXON(info->tty)) {
+               mxser_set_must_xon1_value(info->ioaddr, START_CHAR(info->port.tty));
+               mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(info->port.tty));
+               if (I_IXON(info->port.tty)) {
                        mxser_enable_must_rx_software_flow_control(
                                        info->ioaddr);
                } else {
                        mxser_disable_must_rx_software_flow_control(
                                        info->ioaddr);
                }
-               if (I_IXOFF(info->tty)) {
+               if (I_IXOFF(info->port.tty)) {
                        mxser_enable_must_tx_software_flow_control(
                                        info->ioaddr);
                } else {
@@ -890,15 +885,15 @@ static void mxser_check_modem_status(struct mxser_port *port, int status)
        port->mon_data.modem_status = status;
        wake_up_interruptible(&port->delta_msr_wait);
 
-       if ((port->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
+       if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
                if (status & UART_MSR_DCD)
-                       wake_up_interruptible(&port->open_wait);
+                       wake_up_interruptible(&port->port.open_wait);
        }
 
-       if (port->flags & ASYNC_CTS_FLOW) {
-               if (port->tty->hw_stopped) {
+       if (port->port.flags & ASYNC_CTS_FLOW) {
+               if (port->port.tty->hw_stopped) {
                        if (status & UART_MSR_CTS) {
-                               port->tty->hw_stopped = 0;
+                               port->port.tty->hw_stopped = 0;
 
                                if ((port->type != PORT_16550A) &&
                                                (!port->board->chip_flag)) {
@@ -908,11 +903,11 @@ static void mxser_check_modem_status(struct mxser_port *port, int status)
                                        outb(port->IER, port->ioaddr +
                                                        UART_IER);
                                }
-                               tty_wakeup(port->tty);
+                               tty_wakeup(port->port.tty);
                        }
                } else {
                        if (!(status & UART_MSR_CTS)) {
-                               port->tty->hw_stopped = 1;
+                               port->port.tty->hw_stopped = 1;
                                if (port->type != PORT_16550A &&
                                                !port->board->chip_flag) {
                                        port->IER &= ~UART_IER_THRI;
@@ -935,23 +930,23 @@ static int mxser_startup(struct mxser_port *info)
 
        spin_lock_irqsave(&info->slock, flags);
 
-       if (info->flags & ASYNC_INITIALIZED) {
+       if (info->port.flags & ASYNC_INITIALIZED) {
                free_page(page);
                spin_unlock_irqrestore(&info->slock, flags);
                return 0;
        }
 
        if (!info->ioaddr || !info->type) {
-               if (info->tty)
-                       set_bit(TTY_IO_ERROR, &info->tty->flags);
+               if (info->port.tty)
+                       set_bit(TTY_IO_ERROR, &info->port.tty->flags);
                free_page(page);
                spin_unlock_irqrestore(&info->slock, flags);
                return 0;
        }
-       if (info->xmit_buf)
+       if (info->port.xmit_buf)
                free_page(page);
        else
-               info->xmit_buf = (unsigned char *) page;
+               info->port.xmit_buf = (unsigned char *) page;
 
        /*
         * Clear the FIFO buffers and disable them
@@ -973,8 +968,8 @@ static int mxser_startup(struct mxser_port *info)
        if (inb(info->ioaddr + UART_LSR) == 0xff) {
                spin_unlock_irqrestore(&info->slock, flags);
                if (capable(CAP_SYS_ADMIN)) {
-                       if (info->tty)
-                               set_bit(TTY_IO_ERROR, &info->tty->flags);
+                       if (info->port.tty)
+                               set_bit(TTY_IO_ERROR, &info->port.tty->flags);
                        return 0;
                } else
                        return -ENODEV;
@@ -1012,15 +1007,15 @@ static int mxser_startup(struct mxser_port *info)
        (void) inb(info->ioaddr + UART_IIR);
        (void) inb(info->ioaddr + UART_MSR);
 
-       if (info->tty)
-               clear_bit(TTY_IO_ERROR, &info->tty->flags);
+       if (info->port.tty)
+               clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 
        /*
         * and set the speed of the serial port
         */
        mxser_change_speed(info, NULL);
-       info->flags |= ASYNC_INITIALIZED;
+       info->port.flags |= ASYNC_INITIALIZED;
        spin_unlock_irqrestore(&info->slock, flags);
 
        return 0;
@@ -1034,7 +1029,7 @@ static void mxser_shutdown(struct mxser_port *info)
 {
        unsigned long flags;
 
-       if (!(info->flags & ASYNC_INITIALIZED))
+       if (!(info->port.flags & ASYNC_INITIALIZED))
                return;
 
        spin_lock_irqsave(&info->slock, flags);
@@ -1048,15 +1043,15 @@ static void mxser_shutdown(struct mxser_port *info)
        /*
         * Free the IRQ, if necessary
         */
-       if (info->xmit_buf) {
-               free_page((unsigned long) info->xmit_buf);
-               info->xmit_buf = NULL;
+       if (info->port.xmit_buf) {
+               free_page((unsigned long) info->port.xmit_buf);
+               info->port.xmit_buf = NULL;
        }
 
        info->IER = 0;
        outb(0x00, info->ioaddr + UART_IER);
 
-       if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
+       if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
                info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
        outb(info->MCR, info->ioaddr + UART_MCR);
 
@@ -1072,10 +1067,10 @@ static void mxser_shutdown(struct mxser_port *info)
        /* read data port to reset things */
        (void) inb(info->ioaddr + UART_RX);
 
-       if (info->tty)
-               set_bit(TTY_IO_ERROR, &info->tty->flags);
+       if (info->port.tty)
+               set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 
-       info->flags &= ~ASYNC_INITIALIZED;
+       info->port.flags &= ~ASYNC_INITIALIZED;
 
        if (info->board->chip_flag)
                SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
@@ -1105,12 +1100,12 @@ static int mxser_open(struct tty_struct *tty, struct file *filp)
                return -ENODEV;
 
        tty->driver_data = info;
-       info->tty = tty;
+       info->port.tty = tty;
        /*
         * Start up serial port
         */
        spin_lock_irqsave(&info->slock, flags);
-       info->count++;
+       info->port.count++;
        spin_unlock_irqrestore(&info->slock, flags);
        retval = mxser_startup(info);
        if (retval)
@@ -1170,34 +1165,34 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
                spin_unlock_irqrestore(&info->slock, flags);
                return;
        }
-       if ((tty->count == 1) && (info->count != 1)) {
+       if ((tty->count == 1) && (info->port.count != 1)) {
                /*
                 * Uh, oh.  tty->count is 1, which means that the tty
-                * structure will be freed.  Info->count should always
+                * structure will be freed.  Info->port.count should always
                 * be one in these conditions.  If it's greater than
                 * one, we've got real problems, since it means the
                 * serial port won't be shutdown.
                 */
                printk(KERN_ERR "mxser_close: bad serial port count; "
-                       "tty->count is 1, info->count is %d\n", info->count);
-               info->count = 1;
+                       "tty->count is 1, info->port.count is %d\n", info->port.count);
+               info->port.count = 1;
        }
-       if (--info->count < 0) {
+       if (--info->port.count < 0) {
                printk(KERN_ERR "mxser_close: bad serial port count for "
-                       "ttys%d: %d\n", tty->index, info->count);
-               info->count = 0;
+                       "ttys%d: %d\n", tty->index, info->port.count);
+               info->port.count = 0;
        }
-       if (info->count) {
+       if (info->port.count) {
                spin_unlock_irqrestore(&info->slock, flags);
                return;
        }
-       info->flags |= ASYNC_CLOSING;
+       info->port.flags |= ASYNC_CLOSING;
        spin_unlock_irqrestore(&info->slock, flags);
        /*
         * Save the termios structure, since this port may have
         * separate termios for callout and dialin.
         */
-       if (info->flags & ASYNC_NORMAL_ACTIVE)
+       if (info->port.flags & ASYNC_NORMAL_ACTIVE)
                info->normal_termios = *tty->termios;
        /*
         * Now we wait for the transmit buffer to clear; and we notify
@@ -1216,7 +1211,7 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
        if (info->board->chip_flag)
                info->IER &= ~MOXA_MUST_RECV_ISR;
 
-       if (info->flags & ASYNC_INITIALIZED) {
+       if (info->port.flags & ASYNC_INITIALIZED) {
                outb(info->IER, info->ioaddr + UART_IER);
                /*
                 * Before we drop DTR, make sure the UART transmitter
@@ -1237,14 +1232,14 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
 
        tty->closing = 0;
        info->event = 0;
-       info->tty = NULL;
-       if (info->blocked_open) {
+       info->port.tty = NULL;
+       if (info->port.blocked_open) {
                if (info->close_delay)
                        schedule_timeout_interruptible(info->close_delay);
-               wake_up_interruptible(&info->open_wait);
+               wake_up_interruptible(&info->port.open_wait);
        }
 
-       info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
+       info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
 }
 
 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
@@ -1253,7 +1248,7 @@ static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int cou
        struct mxser_port *info = tty->driver_data;
        unsigned long flags;
 
-       if (!info->xmit_buf)
+       if (!info->port.xmit_buf)
                return 0;
 
        while (1) {
@@ -1262,7 +1257,7 @@ static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int cou
                if (c <= 0)
                        break;
 
-               memcpy(info->xmit_buf + info->xmit_head, buf, c);
+               memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
                spin_lock_irqsave(&info->slock, flags);
                info->xmit_head = (info->xmit_head + c) &
                                  (SERIAL_XMIT_SIZE - 1);
@@ -1294,14 +1289,14 @@ static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
        struct mxser_port *info = tty->driver_data;
        unsigned long flags;
 
-       if (!info->xmit_buf)
+       if (!info->port.xmit_buf)
                return 0;
 
        if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
                return 0;
 
        spin_lock_irqsave(&info->slock, flags);
-       info->xmit_buf[info->xmit_head++] = ch;
+       info->port.xmit_buf[info->xmit_head++] = ch;
        info->xmit_head &= SERIAL_XMIT_SIZE - 1;
        info->xmit_cnt++;
        spin_unlock_irqrestore(&info->slock, flags);
@@ -1327,7 +1322,7 @@ static void mxser_flush_chars(struct tty_struct *tty)
 
        if (info->xmit_cnt <= 0 ||
                        tty->stopped ||
-                       !info->xmit_buf ||
+                       !info->port.xmit_buf ||
                        (tty->hw_stopped &&
                         (info->type != PORT_16550A) &&
                         (!info->board->chip_flag)
@@ -1370,10 +1365,10 @@ static int mxser_get_serial_info(struct mxser_port *info,
 {
        struct serial_struct tmp = {
                .type = info->type,
-               .line = info->tty->index,
+               .line = info->port.tty->index,
                .port = info->ioaddr,
                .irq = info->board->irq,
-               .flags = info->flags,
+               .flags = info->port.flags,
                .baud_base = info->baud_base,
                .close_delay = info->close_delay,
                .closing_wait = info->closing_wait,
@@ -1403,33 +1398,33 @@ static int mxser_set_serial_info(struct mxser_port *info,
                        new_serial.port != info->ioaddr)
                return -EINVAL;
 
-       flags = info->flags & ASYNC_SPD_MASK;
+       flags = info->port.flags & ASYNC_SPD_MASK;
 
        if (!capable(CAP_SYS_ADMIN)) {
                if ((new_serial.baud_base != info->baud_base) ||
                                (new_serial.close_delay != info->close_delay) ||
-                               ((new_serial.flags & ~ASYNC_USR_MASK) != (info->flags & ~ASYNC_USR_MASK)))
+                               ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
                        return -EPERM;
-               info->flags = ((info->flags & ~ASYNC_USR_MASK) |
+               info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
                                (new_serial.flags & ASYNC_USR_MASK));
        } else {
                /*
                 * OK, past this point, all the error checking has been done.
                 * At this point, we start making changes.....
                 */
-               info->flags = ((info->flags & ~ASYNC_FLAGS) |
+               info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
                                (new_serial.flags & ASYNC_FLAGS));
                info->close_delay = new_serial.close_delay * HZ / 100;
                info->closing_wait = new_serial.closing_wait * HZ / 100;
-               info->tty->low_latency =
-                               (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
-               info->tty->low_latency = 0;
-               if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
+               info->port.tty->low_latency =
+                               (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+               info->port.tty->low_latency = 0;
+               if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
                                (new_serial.baud_base != info->baud_base ||
                                new_serial.custom_divisor !=
                                info->custom_divisor)) {
                        baud = new_serial.baud_base / new_serial.custom_divisor;
-                       tty_encode_baud_rate(info->tty, baud, baud);
+                       tty_encode_baud_rate(info->port.tty, baud, baud);
                }
        }
 
@@ -1437,8 +1432,8 @@ static int mxser_set_serial_info(struct mxser_port *info,
 
        process_txrx_fifo(info);
 
-       if (info->flags & ASYNC_INITIALIZED) {
-               if (flags != (info->flags & ASYNC_SPD_MASK)) {
+       if (info->port.flags & ASYNC_INITIALIZED) {
+               if (flags != (info->port.flags & ASYNC_SPD_MASK)) {
                        spin_lock_irqsave(&info->slock, sl_flags);
                        mxser_change_speed(info, NULL);
                        spin_unlock_irqrestore(&info->slock, sl_flags);
@@ -1693,12 +1688,12 @@ static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
                                        continue;
                                }
 
-                               if (!port->tty || !port->tty->termios)
+                               if (!port->port.tty || !port->port.tty->termios)
                                        GMStatus[i].cflag =
                                                port->normal_termios.c_cflag;
                                else
                                        GMStatus[i].cflag =
-                                               port->tty->termios->c_cflag;
+                                               port->port.tty->termios->c_cflag;
 
                                status = inb(port->ioaddr + UART_MSR);
                                if (status & 0x80 /*UART_MSR_DCD */ )
@@ -1755,14 +1750,14 @@ static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
                                mon_data_ext.modem_status[i] =
                                        port->mon_data.modem_status;
                                mon_data_ext.baudrate[i] =
-                                       tty_get_baud_rate(port->tty);
+                                       tty_get_baud_rate(port->port.tty);
 
-                               if (!port->tty || !port->tty->termios) {
+                               if (!port->port.tty || !port->port.tty->termios) {
                                        cflag = port->normal_termios.c_cflag;
                                        iflag = port->normal_termios.c_iflag;
                                } else {
-                                       cflag = port->tty->termios->c_cflag;
-                                       iflag = port->tty->termios->c_iflag;
+                                       cflag = port->port.tty->termios->c_cflag;
+                                       iflag = port->port.tty->termios->c_iflag;
                                }
 
                                mon_data_ext.databits[i] = cflag & CSIZE;
@@ -1989,7 +1984,7 @@ static int mxser_ioctl(struct tty_struct *tty, struct file *file,
                else
                        info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
 
-               if (info->tty->hw_stopped)
+               if (info->port.tty->hw_stopped)
                        info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
                else
                        info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
@@ -2038,7 +2033,7 @@ static void mxser_stoprx(struct tty_struct *tty)
                }
        }
 
-       if (info->tty->termios->c_cflag & CRTSCTS) {
+       if (info->port.tty->termios->c_cflag & CRTSCTS) {
                info->MCR &= ~UART_MCR_RTS;
                outb(info->MCR, info->ioaddr + UART_MCR);
        }
@@ -2075,7 +2070,7 @@ static void mxser_unthrottle(struct tty_struct *tty)
                }
        }
 
-       if (info->tty->termios->c_cflag & CRTSCTS) {
+       if (info->port.tty->termios->c_cflag & CRTSCTS) {
                info->MCR |= UART_MCR_RTS;
                outb(info->MCR, info->ioaddr + UART_MCR);
        }
@@ -2106,7 +2101,7 @@ static void mxser_start(struct tty_struct *tty)
        unsigned long flags;
 
        spin_lock_irqsave(&info->slock, flags);
-       if (info->xmit_cnt && info->xmit_buf) {
+       if (info->xmit_cnt && info->port.xmit_buf) {
                outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
                info->IER |= UART_IER_THRI;
                outb(info->IER, info->ioaddr + UART_IER);
@@ -2220,10 +2215,10 @@ static void mxser_hangup(struct tty_struct *tty)
        mxser_flush_buffer(tty);
        mxser_shutdown(info);
        info->event = 0;
-       info->count = 0;
-       info->flags &= ~ASYNC_NORMAL_ACTIVE;
-       info->tty = NULL;
-       wake_up_interruptible(&info->open_wait);
+       info->port.count = 0;
+       info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
+       info->port.tty = NULL;
+       wake_up_interruptible(&info->port.open_wait);
 }
 
 /*
@@ -2246,7 +2241,7 @@ static void mxser_rs_break(struct tty_struct *tty, int break_state)
 
 static void mxser_receive_chars(struct mxser_port *port, int *status)
 {
-       struct tty_struct *tty = port->tty;
+       struct tty_struct *tty = port->port.tty;
        unsigned char ch, gdl;
        int ignored = 0;
        int cnt = 0;
@@ -2302,7 +2297,7 @@ intr_old:
                                        flag = TTY_BREAK;
                                        port->icount.brk++;
 
-                                       if (port->flags & ASYNC_SAK)
+                                       if (port->port.flags & ASYNC_SAK)
                                                do_SAK(tty);
                                } else if (*status & UART_LSR_PE) {
                                        flag = TTY_PARITY;
@@ -2333,7 +2328,7 @@ intr_old:
        } while (*status & UART_LSR_DR);
 
 end_intr:
-       mxvar_log.rxcnt[port->tty->index] += cnt;
+       mxvar_log.rxcnt[port->port.tty->index] += cnt;
        port->mon_data.rxcnt += cnt;
        port->mon_data.up_rxcnt += cnt;
 
@@ -2354,18 +2349,18 @@ static void mxser_transmit_chars(struct mxser_port *port)
        if (port->x_char) {
                outb(port->x_char, port->ioaddr + UART_TX);
                port->x_char = 0;
-               mxvar_log.txcnt[port->tty->index]++;
+               mxvar_log.txcnt[port->port.tty->index]++;
                port->mon_data.txcnt++;
                port->mon_data.up_txcnt++;
                port->icount.tx++;
                return;
        }
 
-       if (port->xmit_buf == NULL)
+       if (port->port.xmit_buf == NULL)
                return;
 
-       if ((port->xmit_cnt <= 0) || port->tty->stopped ||
-                       (port->tty->hw_stopped &&
+       if ((port->xmit_cnt <= 0) || port->port.tty->stopped ||
+                       (port->port.tty->hw_stopped &&
                        (port->type != PORT_16550A) &&
                        (!port->board->chip_flag))) {
                port->IER &= ~UART_IER_THRI;
@@ -2376,20 +2371,20 @@ static void mxser_transmit_chars(struct mxser_port *port)
        cnt = port->xmit_cnt;
        count = port->xmit_fifo_size;
        do {
-               outb(port->xmit_buf[port->xmit_tail++],
+               outb(port->port.xmit_buf[port->xmit_tail++],
                        port->ioaddr + UART_TX);
                port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
                if (--port->xmit_cnt <= 0)
                        break;
        } while (--count > 0);
-       mxvar_log.txcnt[port->tty->index] += (cnt - port->xmit_cnt);
+       mxvar_log.txcnt[port->port.tty->index] += (cnt - port->xmit_cnt);
 
        port->mon_data.txcnt += (cnt - port->xmit_cnt);
        port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
        port->icount.tx += (cnt - port->xmit_cnt);
 
        if (port->xmit_cnt < WAKEUP_CHARS)
-               tty_wakeup(port->tty);
+               tty_wakeup(port->port.tty);
 
        if (port->xmit_cnt <= 0) {
                port->IER &= ~UART_IER_THRI;
@@ -2440,9 +2435,9 @@ static irqreturn_t mxser_interrupt(int irq, void *dev_id)
                                if (iir & UART_IIR_NO_INT)
                                        break;
                                iir &= MOXA_MUST_IIR_MASK;
-                               if (!port->tty ||
-                                               (port->flags & ASYNC_CLOSING) ||
-                                               !(port->flags &
+                               if (!port->port.tty ||
+                                               (port->port.flags & ASYNC_CLOSING) ||
+                                               !(port->port.flags &
                                                        ASYNC_INITIALIZED)) {
                                        status = inb(port->ioaddr + UART_LSR);
                                        outb(0x27, port->ioaddr + UART_FCR);
@@ -2558,7 +2553,7 @@ static int __devinit mxser_initbrd(struct mxser_board *brd,
                if (brd->chip_flag != MOXA_OTHER_UART)
                        mxser_enable_must_enchance_mode(info->ioaddr);
 
-               info->flags = ASYNC_SHARE_IRQ;
+               info->port.flags = ASYNC_SHARE_IRQ;
                info->type = brd->uart_type;
 
                process_txrx_fifo(info);
@@ -2567,7 +2562,7 @@ static int __devinit mxser_initbrd(struct mxser_board *brd,
                info->close_delay = 5 * HZ / 10;
                info->closing_wait = 30 * HZ;
                info->normal_termios = mxvar_sdriver->init_termios;
-               init_waitqueue_head(&info->open_wait);
+               tty_port_init(&info->port);
                init_waitqueue_head(&info->delta_msr_wait);
                memset(&info->mon_data, 0, sizeof(struct mxser_mon));
                info->err_shadow = 0;