serial: move delta_msr_wait into the tty_port

This is used by various drivers not just serial and can be extracted
as commonality

Signed-off-by: Alan Cox <alan@linux.intel.com>

drivers/char/cyclades.c

@@ -729,7 +729,7 @@ static void cyy_chip_modem(struct cyclades_card *cinfo, int chip,
 		if (mdm_change & CyRI)
 			info->icount.rng++;
 
-		wake_up_interruptible(&info->delta_msr_wait);
+		wake_up_interruptible(&info->port.delta_msr_wait);
 	}
 
 	if ((mdm_change & CyDCD) && (info->port.flags & ASYNC_CHECK_CD)) {
@@ -1197,7 +1197,7 @@ static void cyz_handle_cmd(struct cyclades_card *cinfo)
 			break;
 		}
 		if (delta_count)
-			wake_up_interruptible(&info->delta_msr_wait);
+			wake_up_interruptible(&info->port.delta_msr_wait);
 		if (special_count)
 			tty_schedule_flip(tty);
 		tty_kref_put(tty);
@@ -1464,7 +1464,7 @@ static void cy_shutdown(struct cyclades_port *info, struct tty_struct *tty)
 		spin_lock_irqsave(&card->card_lock, flags);
 
 		/* Clear delta_msr_wait queue to avoid mem leaks. */
-		wake_up_interruptible(&info->delta_msr_wait);
+		wake_up_interruptible(&info->port.delta_msr_wait);
 
 		if (info->port.xmit_buf) {
 			unsigned char *temp;
@@ -2788,7 +2788,7 @@ cy_ioctl(struct tty_struct *tty, struct file *file,
 		/* note the counters on entry */
 		cnow = info->icount;
 		spin_unlock_irqrestore(&info->card->card_lock, flags);
-		ret_val = wait_event_interruptible(info->delta_msr_wait,
+		ret_val = wait_event_interruptible(info->port.delta_msr_wait,
 				cy_cflags_changed(info, arg, &cnow));
 		break;
 
@@ -3153,7 +3153,6 @@ static int __devinit cy_init_card(struct cyclades_card *cinfo)
 		info->port.close_delay = 5 * HZ / 10;
 		info->port.flags = STD_COM_FLAGS;
 		init_completion(&info->shutdown_wait);
-		init_waitqueue_head(&info->delta_msr_wait);
 
 		if (cy_is_Z(cinfo)) {
 			struct FIRM_ID *firm_id = cinfo->base_addr + ID_ADDRESS;

drivers/char/esp.c

@@ -572,7 +572,7 @@ static void check_modem_status(struct esp_struct *info)
 			info->icount.dcd++;
 		if (status & UART_MSR_DCTS)
 			info->icount.cts++;
-		wake_up_interruptible(&info->delta_msr_wait);
+		wake_up_interruptible(&info->port.delta_msr_wait);
 	}
 
 	if ((info->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
@@ -927,7 +927,7 @@ static void shutdown(struct esp_struct *info)
 	 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 	 * here so the queue might never be waken up
 	 */
-	wake_up_interruptible(&info->delta_msr_wait);
+	wake_up_interruptible(&info->port.delta_msr_wait);
 	wake_up_interruptible(&info->break_wait);
 
 	/* stop a DMA transfer on the port being closed */
@@ -1800,7 +1800,7 @@ static int rs_ioctl(struct tty_struct *tty, struct file *file,
 		spin_unlock_irqrestore(&info->lock, flags);
 		while (1) {
 			/* FIXME: convert to new style wakeup */
-			interruptible_sleep_on(&info->delta_msr_wait);
+			interruptible_sleep_on(&info->port.delta_msr_wait);
 			/* see if a signal did it */
 			if (signal_pending(current))
 				return -ERESTARTSYS;
@@ -2452,7 +2452,6 @@ static int __init espserial_init(void)
 		info->config.flow_off = flow_off;
 		info->config.pio_threshold = pio_threshold;
 		info->next_port = ports;
-		init_waitqueue_head(&info->delta_msr_wait);
 		init_waitqueue_head(&info->break_wait);
 		ports = info;
 		printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",

drivers/char/mxser.c

@@ -258,7 +258,6 @@ struct mxser_port {
 	struct mxser_mon mon_data;
 
 	spinlock_t slock;
-	wait_queue_head_t delta_msr_wait;
 };
 
 struct mxser_board {
@@ -818,7 +817,7 @@ static void mxser_check_modem_status(struct tty_struct *tty,
 	if (status & UART_MSR_DCTS)
 		port->icount.cts++;
 	port->mon_data.modem_status = status;
-	wake_up_interruptible(&port->delta_msr_wait);
+	wake_up_interruptible(&port->port.delta_msr_wait);
 
 	if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 		if (status & UART_MSR_DCD)
@@ -973,7 +972,7 @@ static void mxser_shutdown(struct tty_struct *tty)
 	 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 	 * here so the queue might never be waken up
 	 */
-	wake_up_interruptible(&info->delta_msr_wait);
+	wake_up_interruptible(&info->port.delta_msr_wait);
 
 	/*
 	 * Free the IRQ, if necessary
@@ -1762,7 +1761,7 @@ static int mxser_ioctl(struct tty_struct *tty, struct file *file,
 		cnow = info->icount;	/* note the counters on entry */
 		spin_unlock_irqrestore(&info->slock, flags);
 
-		return wait_event_interruptible(info->delta_msr_wait,
+		return wait_event_interruptible(info->port.delta_msr_wait,
 				mxser_cflags_changed(info, arg, &cnow));
 	/*
 	 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
@@ -2414,7 +2413,6 @@ static int __devinit mxser_initbrd(struct mxser_board *brd,
 		info->port.close_delay = 5 * HZ / 10;
 		info->port.closing_wait = 30 * HZ;
 		info->normal_termios = mxvar_sdriver->init_termios;
-		init_waitqueue_head(&info->delta_msr_wait);
 		memset(&info->mon_data, 0, sizeof(struct mxser_mon));
 		info->err_shadow = 0;
 		spin_lock_init(&info->slock);

drivers/char/tty_port.c

@@ -23,6 +23,7 @@ void tty_port_init(struct tty_port *port)
 	memset(port, 0, sizeof(*port));
 	init_waitqueue_head(&port->open_wait);
 	init_waitqueue_head(&port->close_wait);
+	init_waitqueue_head(&port->delta_msr_wait);
 	mutex_init(&port->mutex);
 	spin_lock_init(&port->lock);
 	port->close_delay = (50 * HZ) / 100;
@@ -124,6 +125,7 @@ void tty_port_hangup(struct tty_port *port)
 	port->tty = NULL;
 	spin_unlock_irqrestore(&port->lock, flags);
 	wake_up_interruptible(&port->open_wait);
+	wake_up_interruptible(&port->delta_msr_wait);
 	tty_port_shutdown(port);
 }
 EXPORT_SYMBOL(tty_port_hangup);

drivers/serial/8250.c

@@ -1510,7 +1510,7 @@ static unsigned int check_modem_status(struct uart_8250_port *up)
 		if (status & UART_MSR_DCTS)
 			uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
 
-		wake_up_interruptible(&up->port.state->delta_msr_wait);
+		wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 	}
 
 	return status;

drivers/serial/amba-pl010.c

@@ -225,7 +225,7 @@ static void pl010_modem_status(struct uart_amba_port *uap)
 	if (delta & UART01x_FR_CTS)
 		uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
 
-	wake_up_interruptible(&uap->port.state->delta_msr_wait);
+	wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
 }
 
 static irqreturn_t pl010_int(int irq, void *dev_id)

drivers/serial/amba-pl011.c

@@ -226,7 +226,7 @@ static void pl011_modem_status(struct uart_amba_port *uap)
 	if (delta & UART01x_FR_CTS)
 		uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
 
-	wake_up_interruptible(&uap->port.state->delta_msr_wait);
+	wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
 }
 
 static irqreturn_t pl011_int(int irq, void *dev_id)

drivers/serial/atmel_serial.c

@@ -776,7 +776,7 @@ static void atmel_tasklet_func(unsigned long data)
 		if (status_change & ATMEL_US_CTS)
 			uart_handle_cts_change(port, !(status & ATMEL_US_CTS));
 
-		wake_up_interruptible(&port->state->delta_msr_wait);
+		wake_up_interruptible(&port->state->port.delta_msr_wait);
 
 		atmel_port->irq_status_prev = status;
 	}

drivers/serial/icom.c

@@ -695,7 +695,7 @@ static inline void check_modem_status(struct icom_port *icom_port)
 					       delta_status & ICOM_CTS);
 
 		wake_up_interruptible(&icom_port->uart_port.state->
-				      delta_msr_wait);
+				      port.delta_msr_wait);
 		old_status = status;
 	}
 	spin_unlock(&icom_port->uart_port.lock);

drivers/serial/imx.c

@@ -224,7 +224,7 @@ static void imx_mctrl_check(struct imx_port *sport)
 	if (changed & TIOCM_CTS)
 		uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
 
-	wake_up_interruptible(&sport->port.state->delta_msr_wait);
+	wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
 }
 
 /*
@@ -388,7 +388,7 @@ static irqreturn_t imx_rtsint(int irq, void *dev_id)
 
 	writel(USR1_RTSD, sport->port.membase + USR1);
 	uart_handle_cts_change(&sport->port, !!val);
-	wake_up_interruptible(&sport->port.state->delta_msr_wait);
+	wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
 
 	spin_unlock_irqrestore(&sport->port.lock, flags);
 	return IRQ_HANDLED;

drivers/serial/ioc3_serial.c

@@ -1287,7 +1287,7 @@ static inline int do_read(struct uart_port *the_port, char *buf, int len)
 							(port->ip_port, 0);
 						wake_up_interruptible
 						    (&the_port->state->
-						     delta_msr_wait);
+						     port.delta_msr_wait);
 					}
 
 					/* If we had any data to return, we
@@ -1491,7 +1491,7 @@ ioc3uart_intr_one(struct ioc3_submodule *is,
 				uart_handle_dcd_change(the_port,
 						shadow & SHADOW_DCD);
 				wake_up_interruptible
-				    (&the_port->state->delta_msr_wait);
+				    (&the_port->state->port.delta_msr_wait);
 			} else if ((port->ip_notify & N_DDCD)
 				   && !(shadow & SHADOW_DCD)) {
 				/* Flag delta DCD/no DCD */
@@ -1511,7 +1511,7 @@ ioc3uart_intr_one(struct ioc3_submodule *is,
 				uart_handle_cts_change(the_port, shadow
 						& SHADOW_CTS);
 				wake_up_interruptible
-				    (&the_port->state->delta_msr_wait);
+				    (&the_port->state->port.delta_msr_wait);
 			}
 		}
 
@@ -1728,7 +1728,7 @@ static void ic3_shutdown(struct uart_port *the_port)
 		return;
 
 	state = the_port->state;
-	wake_up_interruptible(&state->delta_msr_wait);
+	wake_up_interruptible(&state->port.delta_msr_wait);
 
 	spin_lock_irqsave(&the_port->lock, port_flags);
 	set_notification(port, N_ALL, 0);

drivers/serial/ioc4_serial.c

@@ -1882,7 +1882,7 @@ static void handle_intr(void *arg, uint32_t sio_ir)
 				the_port = port->ip_port;
 				the_port->icount.dcd = 1;
 				wake_up_interruptible
-					    (&the_port->state->delta_msr_wait);
+					    (&the_port->state->port.delta_msr_wait);
 			} else if ((port->ip_notify & N_DDCD)
 					&& !(shadow & IOC4_SHADOW_DCD)) {
 				/* Flag delta DCD/no DCD */
@@ -1904,7 +1904,7 @@ static void handle_intr(void *arg, uint32_t sio_ir)
 				the_port->icount.cts =
 					(shadow & IOC4_SHADOW_CTS) ? 1 : 0;
 				wake_up_interruptible
-					(&the_port->state->delta_msr_wait);
+					(&the_port->state->port.delta_msr_wait);
 			}
 		}
 
@@ -2237,7 +2237,7 @@ static inline int do_read(struct uart_port *the_port, unsigned char *buf,
 						the_port->icount.dcd = 0;
 						wake_up_interruptible
 						    (&the_port->state->
-							delta_msr_wait);
+							port.delta_msr_wait);
 					}
 
 					/* If we had any data to return, we
@@ -2439,7 +2439,7 @@ static void ic4_shutdown(struct uart_port *the_port)
 	state = the_port->state;
 	port->ip_port = NULL;
 
-	wake_up_interruptible(&state->delta_msr_wait);
+	wake_up_interruptible(&state->port.delta_msr_wait);
 
 	if (state->port.tty)
 		set_bit(TTY_IO_ERROR, &state->port.tty->flags);

drivers/serial/ip22zilog.c

@@ -354,7 +354,7 @@ static void ip22zilog_status_handle(struct uart_ip22zilog_port *up,
 			uart_handle_cts_change(&up->port,
 					       (status & CTS));
 
-		wake_up_interruptible(&up->port.state->delta_msr_wait);
+		wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 	}
 
 	up->prev_status = status;

drivers/serial/msm_serial.c

@@ -169,7 +169,7 @@ static void handle_delta_cts(struct uart_port *port)
 {
 	msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
 	port->icount.cts++;
-	wake_up_interruptible(&port->state->delta_msr_wait);
+	wake_up_interruptible(&port->state->port.delta_msr_wait);
 }
 
 static irqreturn_t msm_irq(int irq, void *dev_id)

drivers/serial/pmac_zilog.c

@@ -369,7 +369,7 @@ static void pmz_status_handle(struct uart_pmac_port *uap)
 			uart_handle_cts_change(&uap->port,
 					       !(status & CTS));
 
-		wake_up_interruptible(&uap->port.state->delta_msr_wait);
+		wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
 	}
 
 	if (status & BRK_ABRT)

drivers/serial/pnx8xxx_uart.c

@@ -100,7 +100,7 @@ static void pnx8xxx_mctrl_check(struct pnx8xxx_port *sport)
 	if (changed & TIOCM_CTS)
 		uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
 
-	wake_up_interruptible(&sport->port.state->delta_msr_wait);
+	wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
 }
 
 /*

drivers/serial/pxa.c

@@ -220,7 +220,7 @@ static inline void check_modem_status(struct uart_pxa_port *up)
 	if (status & UART_MSR_DCTS)
 		uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
 
-	wake_up_interruptible(&up->port.state->delta_msr_wait);
+	wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 }
 
 /*

drivers/serial/sa1100.c

@@ -117,7 +117,7 @@ static void sa1100_mctrl_check(struct sa1100_port *sport)
 	if (changed & TIOCM_CTS)
 		uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
 
-	wake_up_interruptible(&sport->port.state->delta_msr_wait);
+	wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
 }
 
 /*

drivers/serial/sb1250-duart.c

@@ -440,7 +440,7 @@ static void sbd_status_handle(struct sbd_port *sport)
 
 	if (delta & ((M_DUART_IN_PIN2_VAL | M_DUART_IN_PIN0_VAL) <<
 		     S_DUART_IN_PIN_CHNG))
-		wake_up_interruptible(&uport->state->delta_msr_wait);
+		wake_up_interruptible(&uport->state->port.delta_msr_wait);
 }
 
 static irqreturn_t sbd_interrupt(int irq, void *dev_id)

drivers/serial/serial_core.c

@@ -215,7 +215,8 @@ static int uart_startup(struct uart_state *state, int init_hw)
 static void uart_shutdown(struct uart_state *state)
 {
 	struct uart_port *uport = state->uart_port;
-	struct tty_struct *tty = state->port.tty;
+	struct tty_port *port = &state->port;
+	struct tty_struct *tty = port->tty;
 
 	/*
 	 * Set the TTY IO error marker
@@ -223,7 +224,7 @@ static void uart_shutdown(struct uart_state *state)
 	if (tty)
 		set_bit(TTY_IO_ERROR, &tty->flags);
 
-	if (test_and_clear_bit(ASYNCB_INITIALIZED, &state->port.flags)) {
+	if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) {
 		/*
 		 * Turn off DTR and RTS early.
 		 */
@@ -237,7 +238,7 @@ static void uart_shutdown(struct uart_state *state)
 		 * any outstanding file descriptors should be pointing at
 		 * hung_up_tty_fops now.
 		 */
-		wake_up_interruptible(&state->delta_msr_wait);
+		wake_up_interruptible(&port->delta_msr_wait);
 
 		/*
 		 * Free the IRQ and disable the port.
@@ -1004,11 +1005,15 @@ static int uart_do_autoconfig(struct uart_state *state)
  * - mask passed in arg for lines of interest
  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
  * Caller should use TIOCGICOUNT to see which one it was
+ *
+ * FIXME: This wants extracting into a common all driver implementation
+ * of TIOCMWAIT using tty_port.
  */
 static int
 uart_wait_modem_status(struct uart_state *state, unsigned long arg)
 {
 	struct uart_port *uport = state->uart_port;
+	struct tty_port *port = &state->port;
 	DECLARE_WAITQUEUE(wait, current);
 	struct uart_icount cprev, cnow;
 	int ret;
@@ -1025,7 +1030,7 @@ uart_wait_modem_status(struct uart_state *state, unsigned long arg)
 	uport->ops->enable_ms(uport);
 	spin_unlock_irq(&uport->lock);
 
-	add_wait_queue(&state->delta_msr_wait, &wait);
+	add_wait_queue(&port->delta_msr_wait, &wait);
 	for (;;) {
 		spin_lock_irq(&uport->lock);
 		memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
@@ -1053,7 +1058,7 @@ uart_wait_modem_status(struct uart_state *state, unsigned long arg)
 	}
 
 	current->state = TASK_RUNNING;
-	remove_wait_queue(&state->delta_msr_wait, &wait);
+	remove_wait_queue(&port->delta_msr_wait, &wait);
 
 	return ret;
 }
@@ -1430,7 +1435,7 @@ static void uart_hangup(struct tty_struct *tty)
 		clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
 		port->tty = NULL;
 		wake_up_interruptible(&port->open_wait);
-		wake_up_interruptible(&state->delta_msr_wait);
+		wake_up_interruptible(&port->delta_msr_wait);
 	}
 	mutex_unlock(&port->mutex);
 }
@@ -2378,7 +2383,6 @@ int uart_register_driver(struct uart_driver *drv)
 		tty_port_init(port);
 		port->close_delay     = 500;	/* .5 seconds */
 		port->closing_wait    = 30000;	/* 30 seconds */
-		init_waitqueue_head(&state->delta_msr_wait);
 		tasklet_init(&state->tlet, uart_tasklet_action,
 			     (unsigned long)state);
 	}

drivers/serial/serial_ks8695.c

@@ -266,7 +266,7 @@ static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id)
 	if (status & URMS_URTERI)
 		port->icount.rng++;
 
-	wake_up_interruptible(&port->state->delta_msr_wait);
+	wake_up_interruptible(&port->state->port.delta_msr_wait);
 
 	return IRQ_HANDLED;
 }

drivers/serial/serial_lh7a40x.c

@@ -241,7 +241,7 @@ static void lh7a40xuart_modem_status (struct uart_port* port)
 	if (delta & CTS)
 		uart_handle_cts_change (port, status & CTS);
 
-	wake_up_interruptible (&port->state->delta_msr_wait);
+	wake_up_interruptible (&port->state->port.delta_msr_wait);
 }
 
 static irqreturn_t lh7a40xuart_int (int irq, void* dev_id)

drivers/serial/sunsab.c

@@ -297,7 +297,7 @@ static void check_status(struct uart_sunsab_port *up,
 		up->port.icount.dsr++;
 	}
 
-	wake_up_interruptible(&up->port.state->delta_msr_wait);
+	wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 }
 
 static irqreturn_t sunsab_interrupt(int irq, void *dev_id)

drivers/serial/sunsu.c

@@ -441,7 +441,7 @@ static void check_modem_status(struct uart_sunsu_port *up)
 	if (status & UART_MSR_DCTS)
 		uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
 
-	wake_up_interruptible(&up->port.state->delta_msr_wait);
+	wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 }
 
 static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)

drivers/serial/sunzilog.c

@@ -451,7 +451,7 @@ static void sunzilog_status_handle(struct uart_sunzilog_port *up,
 			uart_handle_cts_change(&up->port,
 					       (status & CTS));
 
-		wake_up_interruptible(&up->port.state->delta_msr_wait);
+		wake_up_interruptible(&up->port.state->port.delta_msr_wait);
 	}
 
 	up->prev_status = status;

drivers/serial/timbuart.c

@@ -231,7 +231,7 @@ static void timbuart_mctrl_check(struct uart_port *port, u32 isr, u32 *ier)
 		iowrite32(CTS_DELTA, port->membase + TIMBUART_ISR);
 		cts = timbuart_get_mctrl(port);
 		uart_handle_cts_change(port, cts & TIOCM_CTS);
-		wake_up_interruptible(&port->state->delta_msr_wait);
+		wake_up_interruptible(&port->state->port.delta_msr_wait);
 	}
 
 	*ier |= CTS_DELTA;

drivers/serial/vr41xx_siu.c

@@ -386,7 +386,7 @@ static inline void check_modem_status(struct uart_port *port)
 	if (msr & UART_MSR_DCTS)
 		uart_handle_cts_change(port, msr & UART_MSR_CTS);
 
-	wake_up_interruptible(&port->state->delta_msr_wait);
+	wake_up_interruptible(&port->state->port.delta_msr_wait);
 }
 
 static inline void transmit_chars(struct uart_port *port)

drivers/serial/zs.c

@@ -686,7 +686,7 @@ static void zs_status_handle(struct zs_port *zport, struct zs_port *zport_a)
 			uport->icount.rng++;
 
 		if (delta)
-			wake_up_interruptible(&uport->state->delta_msr_wait);
+			wake_up_interruptible(&uport->state->port.delta_msr_wait);
 
 		spin_lock(&scc->zlock);
 	}

include/linux/cyclades.h

@@ -578,7 +578,6 @@ struct cyclades_port {
 	struct cyclades_idle_stats	idle_stats;
 	struct cyclades_icount	icount;
 	struct completion       shutdown_wait;
-	wait_queue_head_t       delta_msr_wait;
 	int throttle;
 };
 

include/linux/hayesesp.h

@@ -96,7 +96,6 @@ struct esp_struct {
 	int			xmit_head;
 	int			xmit_tail;
 	int			xmit_cnt;
-	wait_queue_head_t	delta_msr_wait;
 	wait_queue_head_t	break_wait;
 	struct async_icount	icount;	/* kernel counters for the 4 input interrupts */
 	struct hayes_esp_config config; /* port configuration */

include/linux/serial_core.h

@@ -349,7 +349,6 @@ struct uart_state {
 	struct circ_buf		xmit;
 
 	struct tasklet_struct	tlet;
-	wait_queue_head_t	delta_msr_wait;
 	struct uart_port	*uart_port;
 };
 

include/linux/tty.h

@@ -203,6 +203,7 @@ struct tty_port {
 	int			count;		/* Usage count */
 	wait_queue_head_t	open_wait;	/* Open waiters */
 	wait_queue_head_t	close_wait;	/* Close waiters */
+	wait_queue_head_t	delta_msr_wait;	/* Modem status change */
 	unsigned long		flags;		/* TTY flags ASY_*/
 	struct mutex		mutex;		/* Locking */
 	unsigned char		*xmit_buf;	/* Optional buffer */