TTY: switch tty_flip_buffer_push

Now, we start converting tty buffer functions to actually use
tty_port. This will allow us to get rid of the need of tty in many
call sites. Only tty_port will needed and hence no more
tty_port_tty_get in those paths.

Now, the one where most of tty_port_tty_get gets removed:
tty_flip_buffer_push.

IOW we also closed all the races in drivers not using tty_port_tty_get
at all yet.

Also we move tty_flip_buffer_push declaration from include/linux/tty.h
to include/linux/tty_flip.h to all others while we are changing it
anyway.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

85 files changed, 224 insertions, 468 deletions

diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 2d1357acbc23..4c7d70172193 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -251,7 +251,6 @@ static void receive_chars(struct serial_state *info)
 {
         int status;
         int serdatr;
-        struct tty_struct *tty = info->tport.tty;
         unsigned char ch, flag;
         struct  async_icount *icount;
         int oe = 0;
@@ -314,7 +313,7 @@ static void receive_chars(struct serial_state *info)
 #endif
             flag = TTY_BREAK;
             if (info->tport.flags & ASYNC_SAK)
-              do_SAK(tty);
+              do_SAK(info->tport.tty);
           } else if (status & UART_LSR_PE)
             flag = TTY_PARITY;
           else if (status & UART_LSR_FE)
@@ -331,7 +330,7 @@ static void receive_chars(struct serial_state *info)
         tty_insert_flip_char(&info->tport, ch, flag);
         if (oe == 1)
                 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&info->tport);
 out:
         return;
 }
diff --git a/drivers/tty/bfin_jtag_comm.c b/drivers/tty/bfin_jtag_comm.c
index 143c38579cb5..a93a424873fa 100644
--- a/drivers/tty/bfin_jtag_comm.c
+++ b/drivers/tty/bfin_jtag_comm.c
@@ -95,18 +95,16 @@ bfin_jc_emudat_manager(void *arg)
 
                 /* if incoming data is ready, eat it */
                 if (bfin_read_DBGSTAT() & EMUDIF) {
-                        if (tty != NULL) {
-                                uint32_t emudat = bfin_read_emudat();
-                                if (inbound_len == 0) {
-                                        pr_debug("incoming length: 0x%08x\n", emudat);
-                                        inbound_len = emudat;
-                                } else {
-                                        size_t num_chars = (4 <= inbound_len ? 4 : inbound_len);
-                                        pr_debug("  incoming data: 0x%08x (pushing %zu)\n", emudat, num_chars);
-                                        inbound_len -= num_chars;
-                                        tty_insert_flip_string(&port, (unsigned char *)&emudat, num_chars);
-                                        tty_flip_buffer_push(tty);
-                                }
+                        uint32_t emudat = bfin_read_emudat();
+                        if (inbound_len == 0) {
+                                pr_debug("incoming length: 0x%08x\n", emudat);
+                                inbound_len = emudat;
+                        } else {
+                                size_t num_chars = (4 <= inbound_len ? 4 : inbound_len);
+                                pr_debug("  incoming data: 0x%08x (pushing %zu)\n", emudat, num_chars);
+                                inbound_len -= num_chars;
+                                tty_insert_flip_string(&port, (unsigned char *)&emudat, num_chars);
+                                tty_flip_buffer_push(&port);
                         }
                 }
 
diff --git a/drivers/tty/ehv_bytechan.c b/drivers/tty/ehv_bytechan.c
index 5164f9a57017..ed92622b8949 100644
--- a/drivers/tty/ehv_bytechan.c
+++ b/drivers/tty/ehv_bytechan.c
@@ -371,16 +371,11 @@ console_initcall(ehv_bc_console_init);
 static irqreturn_t ehv_bc_tty_rx_isr(int irq, void *data)
 {
         struct ehv_bc_data *bc = data;
-        struct tty_struct *ttys = tty_port_tty_get(&bc->port);
         unsigned int rx_count, tx_count, len;
         int count;
         char buffer[EV_BYTE_CHANNEL_MAX_BYTES];
         int ret;
 
-        /* ttys could be NULL during a hangup */
-        if (!ttys)
-                return IRQ_HANDLED;
-
         /* Find out how much data needs to be read, and then ask the TTY layer
          * if it can handle that much.  We want to ensure that every byte we
          * read from the byte channel will be accepted by the TTY layer.
@@ -422,9 +417,7 @@ static irqreturn_t ehv_bc_tty_rx_isr(int irq, void *data)
         }
 
         /* Tell the tty layer that we're done. */
-        tty_flip_buffer_push(ttys);
-
-        tty_kref_put(ttys);
+        tty_flip_buffer_push(&bc->port);
 
         return IRQ_HANDLED;
 }
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index 8c2fe3a0e091..eb255e807c06 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -691,7 +691,7 @@ int hvc_poll(struct hvc_struct *hp)
                    a minimum for performance. */
                 timeout = MIN_TIMEOUT;
 
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&hp->port);
         }
         tty_kref_put(tty);
 
diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index 7bfc0a924b2f..1956593ee89d 100644
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -623,7 +623,7 @@ static int hvcs_io(struct hvcs_struct *hvcsd)
         spin_unlock_irqrestore(&hvcsd->lock, flags);
         /* This is synch because tty->low_latency == 1 */
         if(got)
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&hvcsd->port);
 
         if (!got) {
                 /* Do this _after_ the flip_buffer_push */
diff --git a/drivers/tty/hvc/hvsi.c b/drivers/tty/hvc/hvsi.c
index 1f528b8ebf5f..dc591290120b 100644
--- a/drivers/tty/hvc/hvsi.c
+++ b/drivers/tty/hvc/hvsi.c
@@ -465,7 +465,7 @@ static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct *tty,
         compact_inbuf(hp, packet);
 
         if (flip)
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&hp->port);
 
         return 1;
 }
@@ -511,7 +511,7 @@ static irqreturn_t hvsi_interrupt(int irq, void *arg)
                 /* we weren't hung up and we weren't throttled, so we can
                  * deliver the rest now */
                 hvsi_send_overflow(hp);
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&hp->port);
         }
         spin_unlock_irqrestore(&hp->lock, flags);
 
@@ -998,7 +998,7 @@ static void hvsi_unthrottle(struct tty_struct *tty)
         spin_lock_irqsave(&hp->lock, flags);
         if (hp->n_throttle) {
                 hvsi_send_overflow(hp);
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&hp->port);
         }
         spin_unlock_irqrestore(&hp->lock, flags);
 
diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c
index c43da7445432..8fd72ff9436e 100644
--- a/drivers/tty/ipwireless/tty.c
+++ b/drivers/tty/ipwireless/tty.c
@@ -160,15 +160,9 @@ static void ipw_close(struct tty_struct *linux_tty, struct file *filp)
 void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
                         unsigned int length)
 {
-        struct tty_struct *linux_tty;
         int work = 0;
 
         mutex_lock(&tty->ipw_tty_mutex);
-        linux_tty = tty->port.tty;
-        if (linux_tty == NULL) {
-                mutex_unlock(&tty->ipw_tty_mutex);
-                return;
-        }
 
         if (!tty->port.count) {
                 mutex_unlock(&tty->ipw_tty_mutex);
@@ -187,7 +181,7 @@ void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
          * This may sleep if ->low_latency is set
          */
         if (work)
-                tty_flip_buffer_push(linux_tty);
+                tty_flip_buffer_push(&tty->port);
 }
 
 static void ipw_write_packet_sent_callback(void *callback_data,
diff --git a/drivers/tty/isicom.c b/drivers/tty/isicom.c
index c70144f55fc0..858291ca889c 100644
--- a/drivers/tty/isicom.c
+++ b/drivers/tty/isicom.c
@@ -637,7 +637,7 @@ static irqreturn_t isicom_interrupt(int irq, void *dev_id)
                         tty_insert_flip_char(&port->port, 0, TTY_BREAK);
                         if (port->port.flags & ASYNC_SAK)
                                 do_SAK(tty);
-                        tty_flip_buffer_push(tty);
+                        tty_flip_buffer_push(&port->port);
                         break;
 
                 case 2: /* Statistics            */
@@ -671,7 +671,7 @@ static irqreturn_t isicom_interrupt(int irq, void *dev_id)
                                 byte_count -= 2;
                         }
                 }
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&port->port);
         }
         outw(0x0000, base+0x04); /* enable interrupts */
         spin_unlock(&card->card_lock);
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index e9cdfdfe06e9..ad34a202a34d 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -2145,7 +2145,7 @@ end_intr:
          * recursive locking.
          */
         spin_unlock(&port->slock);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&port->port);
         spin_lock(&port->slock);
 }
 
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 4a3342d21c8f..d84dcfeadce3 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -1141,7 +1141,6 @@ static void gsm_control_modem(struct gsm_mux *gsm, u8 *data, int clen)
 static void gsm_control_rls(struct gsm_mux *gsm, u8 *data, int clen)
 {
         struct tty_port *port;
-        struct tty_struct *tty;
         unsigned int addr = 0 ;
         u8 bits;
         int len = clen;
@@ -1174,12 +1173,8 @@ static void gsm_control_rls(struct gsm_mux *gsm, u8 *data, int clen)
         if (bits & 8)
                 tty_insert_flip_char(port, 0, TTY_FRAME);
 
-        /* See if we have an uplink tty */
-        tty = tty_port_tty_get(port);
-        if (tty) {
-                tty_flip_buffer_push(tty);
-                tty_kref_put(tty);
-        }
+        tty_flip_buffer_push(port);
+
         gsm_control_reply(gsm, CMD_RLS, data, clen);
 }
 
@@ -1552,36 +1547,37 @@ static void gsm_dlci_data(struct gsm_dlci *dlci, u8 *data, int clen)
 {
         /* krefs .. */
         struct tty_port *port = &dlci->port;
-        struct tty_struct *tty = tty_port_tty_get(port);
+        struct tty_struct *tty;
         unsigned int modem = 0;
         int len = clen;
 
         if (debug & 16)
-                pr_debug("%d bytes for tty %p\n", len, tty);
-        if (tty) {
-                switch (dlci->adaption)  {
-                /* Unsupported types */
-                /* Packetised interruptible data */
-                case 4:
-                        break;
-                /* Packetised uininterruptible voice/data */
-                case 3:
-                        break;
-                /* Asynchronous serial with line state in each frame */
-                case 2:
-                        while (gsm_read_ea(&modem, *data++) == 0) {
-                                len--;
-                                if (len == 0)
-                                        return;
-                        }
+                pr_debug("%d bytes for tty\n", len);
+        switch (dlci->adaption)  {
+        /* Unsupported types */
+        /* Packetised interruptible data */
+        case 4:
+                break;
+        /* Packetised uininterruptible voice/data */
+        case 3:
+                break;
+        /* Asynchronous serial with line state in each frame */
+        case 2:
+                while (gsm_read_ea(&modem, *data++) == 0) {
+                        len--;
+                        if (len == 0)
+                                return;
+                }
+                tty = tty_port_tty_get(port);
+                if (tty) {
                         gsm_process_modem(tty, dlci, modem, clen);
-                /* Line state will go via DLCI 0 controls only */
-                case 1:
-                default:
-                        tty_insert_flip_string(port, data, len);
-                        tty_flip_buffer_push(tty);
+                        tty_kref_put(tty);
                 }
-                tty_kref_put(tty);
+        /* Line state will go via DLCI 0 controls only */
+        case 1:
+        default:
+                tty_insert_flip_string(port, data, len);
+                tty_flip_buffer_push(port);
         }
 }
 
diff --git a/drivers/tty/nozomi.c b/drivers/tty/nozomi.c
index 941fe8060ea5..afdd7732d925 100644
--- a/drivers/tty/nozomi.c
+++ b/drivers/tty/nozomi.c
@@ -1272,15 +1272,11 @@ static irqreturn_t interrupt_handler(int irq, void *dev_id)
 
 exit_handler:
         spin_unlock(&dc->spin_mutex);
-        for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
-                struct tty_struct *tty;
-                if (test_and_clear_bit(a, &dc->flip)) {
-                        tty = tty_port_tty_get(&dc->port[a].port);
-                        if (tty)
-                                tty_flip_buffer_push(tty);
-                        tty_kref_put(tty);
-                }
-        }
+
+        for (a = 0; a < NOZOMI_MAX_PORTS; a++)
+                if (test_and_clear_bit(a, &dc->flip))
+                        tty_flip_buffer_push(&dc->port[a].port);
+
         return IRQ_HANDLED;
 none:
         spin_unlock(&dc->spin_mutex);
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 3c285d398f38..32d027c303aa 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -123,7 +123,7 @@ static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
                 c = tty_insert_flip_string(to->port, buf, c);
                 /* And shovel */
                 if (c) {
-                        tty_flip_buffer_push(to);
+                        tty_flip_buffer_push(to->port);
                         tty_wakeup(tty);
                 }
         }
diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index 5848a767001a..8073cc0dff59 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -315,9 +315,8 @@ static inline int rocket_paranoia_check(struct r_port *info,
  *  that receive data is present on a serial port.  Pulls data from FIFO, moves it into the 
  *  tty layer.  
  */
-static void rp_do_receive(struct r_port *info,
-                          struct tty_struct *tty,
-                          CHANNEL_t * cp, unsigned int ChanStatus)
+static void rp_do_receive(struct r_port *info, CHANNEL_t *cp,
+                unsigned int ChanStatus)
 {
         unsigned int CharNStat;
         int ToRecv, wRecv, space;
@@ -416,7 +415,7 @@ static void rp_do_receive(struct r_port *info,
                         cbuf[ToRecv - 1] = sInB(sGetTxRxDataIO(cp));
         }
         /*  Push the data up to the tty layer */
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&info->port);
 }
 
 /*
@@ -495,7 +494,6 @@ static void rp_do_transmit(struct r_port *info)
 static void rp_handle_port(struct r_port *info)
 {
         CHANNEL_t *cp;
-        struct tty_struct *tty;
         unsigned int IntMask, ChanStatus;
 
         if (!info)
@@ -506,12 +504,7 @@ static void rp_handle_port(struct r_port *info)
                                 "info->flags & NOT_INIT\n");
                 return;
         }
-        tty = tty_port_tty_get(&info->port);
-        if (!tty) {
-                printk(KERN_WARNING "rp: WARNING: rp_handle_port called with "
-                                "tty==NULL\n");
-                return;
-        }
+
         cp = &info->channel;
 
         IntMask = sGetChanIntID(cp) & info->intmask;
@@ -520,7 +513,7 @@ static void rp_handle_port(struct r_port *info)
 #endif
         ChanStatus = sGetChanStatus(cp);
         if (IntMask & RXF_TRIG) {       /* Rx FIFO trigger level */
-                rp_do_receive(info, tty, cp, ChanStatus);
+                rp_do_receive(info, cp, ChanStatus);
         }
         if (IntMask & DELTA_CD) {       /* CD change  */
 #if (defined(ROCKET_DEBUG_OPEN) || defined(ROCKET_DEBUG_INTR) || defined(ROCKET_DEBUG_HANGUP))
@@ -528,10 +521,15 @@ static void rp_handle_port(struct r_port *info)
                        (ChanStatus & CD_ACT) ? "on" : "off");
 #endif
                 if (!(ChanStatus & CD_ACT) && info->cd_status) {
+                        struct tty_struct *tty;
 #ifdef ROCKET_DEBUG_HANGUP
                         printk(KERN_INFO "CD drop, calling hangup.\n");
 #endif
-                        tty_hangup(tty);
+                        tty = tty_port_tty_get(&info->port);
+                        if (tty) {
+                                tty_hangup(tty);
+                                tty_kref_put(tty);
+                        }
                 }
                 info->cd_status = (ChanStatus & CD_ACT) ? 1 : 0;
                 wake_up_interruptible(&info->port.open_wait);
@@ -544,7 +542,6 @@ static void rp_handle_port(struct r_port *info)
                 printk(KERN_INFO "DSR change...\n");
         }
 #endif
-        tty_kref_put(tty);
 }
 
 /*
diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
index a44345a2dbb4..c7e8b60b6177 100644
--- a/drivers/tty/serial/21285.c
+++ b/drivers/tty/serial/21285.c
@@ -85,7 +85,6 @@ static void serial21285_enable_ms(struct uart_port *port)
 static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
 {
         struct uart_port *port = dev_id;
-        struct tty_struct *tty = port->state->port.tty;
         unsigned int status, ch, flag, rxs, max_count = 256;
 
         status = *CSR_UARTFLG;
@@ -115,7 +114,7 @@ static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
 
                 status = *CSR_UARTFLG;
         }
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&port->state->port);
 
         return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c
index 5fb6577b94dc..0d771ec16750 100644
--- a/drivers/tty/serial/8250/8250.c
+++ b/drivers/tty/serial/8250/8250.c
@@ -1323,7 +1323,6 @@ unsigned char
 serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr)
 {
         struct uart_port *port = &up->port;
-        struct tty_struct *tty = port->state->port.tty;
         unsigned char ch;
         int max_count = 256;
         char flag;
@@ -1388,7 +1387,7 @@ ignore_char:
                 lsr = serial_in(up, UART_LSR);
         } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
         spin_unlock(&port->lock);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&port->state->port);
         spin_lock(&port->lock);
         return lsr;
 }
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index 872f14ae43d2..84b90fd48063 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -139,7 +139,7 @@ static void altera_jtaguart_rx_chars(struct altera_jtaguart *pp)
                 uart_insert_char(port, 0, 0, ch, flag);
         }
 
-        tty_flip_buffer_push(port->state->port.tty);
+        tty_flip_buffer_push(&port->state->port);
 }
 
 static void altera_jtaguart_tx_chars(struct altera_jtaguart *pp)
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index 684a0808e1c7..e133c8814bb5 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -231,7 +231,7 @@ static void altera_uart_rx_chars(struct altera_uart *pp)
                                  flag);
         }
 
-        tty_flip_buffer_push(port->state->port.tty);
+        tty_flip_buffer_push(&port->state->port);
 }
 
 static void altera_uart_tx_chars(struct altera_uart *pp)
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
index 22317dd16474..c36840519527 100644
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -116,7 +116,6 @@ static void pl010_enable_ms(struct uart_port *port)
 
 static void pl010_rx_chars(struct uart_amba_port *uap)
 {
-        struct tty_struct *tty = uap->port.state->port.tty;
         unsigned int status, ch, flag, rsr, max_count = 256;
 
         status = readb(uap->port.membase + UART01x_FR);
@@ -165,7 +164,7 @@ static void pl010_rx_chars(struct uart_amba_port *uap)
                 status = readb(uap->port.membase + UART01x_FR);
         }
         spin_unlock(&uap->port.lock);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&uap->port.state->port);
         spin_lock(&uap->port.lock);
 }
 
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index e1257d17f5f0..3ea5408fcbeb 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -699,7 +699,6 @@ static void pl011_dma_rx_chars(struct uart_amba_port *uap,
                                bool readfifo)
 {
         struct tty_port *port = &uap->port.state->port;
-        struct tty_struct *tty = port->tty;
         struct pl011_sgbuf *sgbuf = use_buf_b ?
                 &uap->dmarx.sgbuf_b : &uap->dmarx.sgbuf_a;
         struct device *dev = uap->dmarx.chan->device->dev;
@@ -754,7 +753,7 @@ static void pl011_dma_rx_chars(struct uart_amba_port *uap,
         dev_vdbg(uap->port.dev,
                  "Took %d chars from DMA buffer and %d chars from the FIFO\n",
                  dma_count, fifotaken);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(port);
         spin_lock(&uap->port.lock);
 }
 
@@ -1076,12 +1075,10 @@ static void pl011_enable_ms(struct uart_port *port)
 
 static void pl011_rx_chars(struct uart_amba_port *uap)
 {
-        struct tty_struct *tty = uap->port.state->port.tty;
-
         pl011_fifo_to_tty(uap);
 
         spin_unlock(&uap->port.lock);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&uap->port.state->port);
         /*
          * If we were temporarily out of DMA mode for a while,
          * attempt to switch back to DMA mode again.
diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
index 59ae2b53e765..6331464d9101 100644
--- a/drivers/tty/serial/apbuart.c
+++ b/drivers/tty/serial/apbuart.c
@@ -78,7 +78,6 @@ static void apbuart_enable_ms(struct uart_port *port)
 
 static void apbuart_rx_chars(struct uart_port *port)
 {
-        struct tty_struct *tty = port->state->port.tty;
         unsigned int status, ch, rsr, flag;
         unsigned int max_chars = port->fifosize;
 
@@ -126,7 +125,7 @@ static void apbuart_rx_chars(struct uart_port *port)
                 status = UART_GET_STATUS(port);
         }
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&port->state->port);
 }
 
 static void apbuart_tx_chars(struct uart_port *port)
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 6ca5dd615f9e..27f20c57abed 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -298,10 +298,8 @@ static void ar933x_uart_set_termios(struct uart_port *port,
 static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
 {
         struct tty_port *port = &up->port.state->port;
-        struct tty_struct *tty;
         int max_count = 256;
 
-        tty = tty_port_tty_get(port);
         do {
                 unsigned int rdata;
                 unsigned char ch;
@@ -324,10 +322,7 @@ static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
                         tty_insert_flip_char(port, ch, TTY_NORMAL);
         } while (max_count-- > 0);
 
-        if (tty) {
-                tty_flip_buffer_push(tty);
-                tty_kref_put(tty);
-        }
+        tty_flip_buffer_push(port);
 }
 
 static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index b46860104312..da734222e537 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -211,12 +211,8 @@ static void arc_serial_start_tx(struct uart_port *port)
 
 static void arc_serial_rx_chars(struct arc_uart_port *uart)
 {
-        struct tty_struct *tty = tty_port_tty_get(&uart->port.state->port);
         unsigned int status, ch, flg = 0;
 
-        if (!tty)
-                return;
-
         /*
          * UART has 4 deep RX-FIFO. Driver's recongnition of this fact
          * is very subtle. Here's how ...
@@ -252,10 +248,8 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart)
                 uart_insert_char(&uart->port, status, RXOERR, ch, flg);
 
 done:
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&uart->port.state->port);
         }
-
-        tty_kref_put(tty);
 }
 
 /*
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 929567038c5a..d4a7c241b751 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -774,7 +774,7 @@ static void atmel_rx_from_ring(struct uart_port *port)
          * uart_start(), which takes the lock.
          */
         spin_unlock(&port->lock);
-        tty_flip_buffer_push(port->state->port.tty);
+        tty_flip_buffer_push(&port->state->port);
         spin_lock(&port->lock);
 }
 
@@ -782,7 +782,6 @@ static void atmel_rx_from_dma(struct uart_port *port)
 {
         struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         struct atmel_dma_buffer *pdc;
         int rx_idx = atmel_port->pdc_rx_idx;
         unsigned int head;
@@ -850,7 +849,7 @@ static void atmel_rx_from_dma(struct uart_port *port)
          * uart_start(), which takes the lock.
          */
         spin_unlock(&port->lock);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(tport);
         spin_lock(&port->lock);
 
         UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
index de30b1909728..719594e5fc21 100644
--- a/drivers/tty/serial/bcm63xx_uart.c
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -236,14 +236,12 @@ static const char *bcm_uart_type(struct uart_port *port)
 static void bcm_uart_do_rx(struct uart_port *port)
 {
         struct tty_port *port = &port->state->port;
-        struct tty_struct *tty;
         unsigned int max_count;
 
         /* limit number of char read in interrupt, should not be
          * higher than fifo size anyway since we're much faster than
          * serial port */
         max_count = 32;
-        tty = port->tty;
         do {
                 unsigned int iestat, c, cstat;
                 char flag;
@@ -305,7 +303,7 @@ static void bcm_uart_do_rx(struct uart_port *port)
 
         } while (--max_count);
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(port);
 }
 
 /*
diff --git a/drivers/tty/serial/bfin_sport_uart.c b/drivers/tty/serial/bfin_sport_uart.c
index e4d3ac2e8992..487c173b0f72 100644
--- a/drivers/tty/serial/bfin_sport_uart.c
+++ b/drivers/tty/serial/bfin_sport_uart.c
@@ -150,7 +150,6 @@ static irqreturn_t sport_uart_rx_irq(int irq, void *dev_id)
 {
         struct sport_uart_port *up = dev_id;
         struct tty_port *port = &up->port.state->port;
-        struct tty_struct *tty = tport->tty;
         unsigned int ch;
 
         spin_lock(&up->port.lock);
@@ -162,7 +161,8 @@ static irqreturn_t sport_uart_rx_irq(int irq, void *dev_id)
                 if (!uart_handle_sysrq_char(&up->port, ch))
                         tty_insert_flip_char(port, ch, TTY_NORMAL);
         }
-        tty_flip_buffer_push(tty);
+        /* XXX this won't deadlock with lowlat? */
+        tty_flip_buffer_push(port);
 
         spin_unlock(&up->port.lock);
 
diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index 2e2b2c1cb722..12dceda9db33 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -223,7 +223,6 @@ static void bfin_serial_enable_ms(struct uart_port *port)
 #ifdef CONFIG_SERIAL_BFIN_PIO
 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 {
-        struct tty_struct *tty = NULL;
         unsigned int status, ch, flg;
         static struct timeval anomaly_start = { .tv_sec = 0 };
 
@@ -242,11 +241,9 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
                         return;
                 }
 
-        if (!uart->port.state || !uart->port.state->port.tty)
+        if (!uart->port.state)
                 return;
 #endif
-        tty = uart->port.state->port.tty;
-
         if (ANOMALY_05000363) {
                 /* The BF533 (and BF561) family of processors have a nice anomaly
                  * where they continuously generate characters for a "single" break.
@@ -325,7 +322,7 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
         uart_insert_char(&uart->port, status, OE, ch, flg);
 
  ignore_char:
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&uart->port.state->port);
 }
 
 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
@@ -426,7 +423,6 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 
 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 {
-        struct tty_struct *tty = uart->port.state->port.tty;
         int i, flg, status;
 
         status = UART_GET_LSR(uart);
@@ -471,7 +467,7 @@ static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
         }
 
  dma_ignore_char:
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&uart->port.state->port);
 }
 
 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index 3fd2526d121e..bfb17968c8db 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -85,12 +85,8 @@ static void uart_clps711x_enable_ms(struct uart_port *port)
 static irqreturn_t uart_clps711x_int_rx(int irq, void *dev_id)
 {
         struct uart_port *port = dev_id;
-        struct tty_struct *tty = tty_port_tty_get(&port->state->port);
         unsigned int status, ch, flg;
 
-        if (!tty)
-                return IRQ_HANDLED;
-
         for (;;) {
                 status = clps_readl(SYSFLG(port));
                 if (status & SYSFLG_URXFE)
@@ -130,9 +126,7 @@ static irqreturn_t uart_clps711x_int_rx(int irq, void *dev_id)
                 uart_insert_char(port, status, UARTDR_OVERR, ch, flg);
         }
 
-        tty_flip_buffer_push(tty);
-
-        tty_kref_put(tty);
+        tty_flip_buffer_push(&port->state->port);
 
         return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index 0bb24378a3c0..97f4e1858649 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -246,7 +246,6 @@ static void cpm_uart_int_rx(struct uart_port *port)
         unsigned char ch;
         u8 *cp;
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
         cbd_t __iomem *bdp;
         u16 status;
@@ -323,7 +322,7 @@ static void cpm_uart_int_rx(struct uart_port *port)
         pinfo->rx_cur = bdp;
 
         /* activate BH processing */
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(tport);
 
         return;
 
diff --git a/drivers/tty/serial/crisv10.c b/drivers/tty/serial/crisv10.c
index 52449adc09ac..45acf103433e 100644
--- a/drivers/tty/serial/crisv10.c
+++ b/drivers/tty/serial/crisv10.c
@@ -2104,17 +2104,10 @@ static int force_eop_if_needed(struct e100_serial *info)
 
 static void flush_to_flip_buffer(struct e100_serial *info)
 {
-        struct tty_struct *tty;
         struct etrax_recv_buffer *buffer;
         unsigned long flags;
 
         local_irq_save(flags);
-        tty = info->port.tty;
-
-        if (!tty) {
-                local_irq_restore(flags);
-                return;
-        }
 
         while ((buffer = info->first_recv_buffer) != NULL) {
                 unsigned int count = buffer->length;
@@ -2138,7 +2131,7 @@ static void flush_to_flip_buffer(struct e100_serial *info)
         local_irq_restore(flags);
 
         /* This includes a check for low-latency */
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&info->port);
 }
 
 static void check_flush_timeout(struct e100_serial *info)
@@ -2274,12 +2267,6 @@ static
 struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info)
 {
         unsigned long data_read;
-        struct tty_struct *tty = info->port.tty;
-
-        if (!tty) {
-                printk("!NO TTY!\n");
-                return info;
-        }
 
         /* Read data and status at the same time */
         data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]);
@@ -2382,7 +2369,7 @@ more_data:
                 goto more_data;
         }
 
-        tty_flip_buffer_push(info->port.tty);
+        tty_flip_buffer_push(&info->port);
         return info;
 }
 
diff --git a/drivers/tty/serial/dz.c b/drivers/tty/serial/dz.c
index 6491b8644a7f..2f2b2e538a54 100644
--- a/drivers/tty/serial/dz.c
+++ b/drivers/tty/serial/dz.c
@@ -187,7 +187,6 @@ static inline void dz_receive_chars(struct dz_mux *mux)
 {
         struct uart_port *uport;
         struct dz_port *dport = &mux->dport[0];
-        struct tty_struct *tty = NULL;
         struct uart_icount *icount;
         int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 };
         unsigned char ch, flag;
@@ -197,7 +196,6 @@ static inline void dz_receive_chars(struct dz_mux *mux)
         while ((status = dz_in(dport, DZ_RBUF)) & DZ_DVAL) {
                 dport = &mux->dport[LINE(status)];
                 uport = &dport->port;
-                tty = uport->state->port.tty;   /* point to the proper dev */
 
                 ch = UCHAR(status);             /* grab the char */
                 flag = TTY_NORMAL;
@@ -249,7 +247,7 @@ static inline void dz_receive_chars(struct dz_mux *mux)
         }
         for (i = 0; i < DZ_NB_PORT; i++)
                 if (lines_rx[i])
-                        tty_flip_buffer_push(mux->dport[i].port.state->port.tty);
+                        tty_flip_buffer_push(&mux->dport[i].port.state->port);
 }
 
 /*
diff --git a/drivers/tty/serial/efm32-uart.c b/drivers/tty/serial/efm32-uart.c
index bdf67b0cb8b6..de14bd7dce10 100644
--- a/drivers/tty/serial/efm32-uart.c
+++ b/drivers/tty/serial/efm32-uart.c
@@ -249,12 +249,9 @@ static irqreturn_t efm32_uart_rxirq(int irq, void *data)
         int handled = IRQ_NONE;
         struct uart_port *port = &efm_port->port;
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty;
 
         spin_lock(&port->lock);
 
-        tty = tty_kref_get(tport->tty);
-
         if (irqflag & UARTn_IF_RXDATAV) {
                 efm32_uart_write32(efm_port, UARTn_IF_RXDATAV, UARTn_IFC);
                 efm32_uart_rx_chars(efm_port);
@@ -270,10 +267,7 @@ static irqreturn_t efm32_uart_rxirq(int irq, void *data)
                 handled = IRQ_HANDLED;
         }
 
-        if (tty) {
-                tty_flip_buffer_push(tty);
-                tty_kref_put(tty);
-        }
+        tty_flip_buffer_push(tport);
 
         spin_unlock(&port->lock);
 
diff --git a/drivers/tty/serial/icom.c b/drivers/tty/serial/icom.c
index 54903ee5e5ab..bc9e6b017b05 100644
--- a/drivers/tty/serial/icom.c
+++ b/drivers/tty/serial/icom.c
@@ -735,7 +735,6 @@ static void recv_interrupt(u16 port_int_reg, struct icom_port *icom_port)
 {
         short int count, rcv_buff;
         struct tty_port *port = &icom_port->uart_port.state->port;
-        struct tty_struct *tty = port->tty;
         unsigned short int status;
         struct uart_icount *icount;
         unsigned long offset;
@@ -835,7 +834,7 @@ ignore_char:
                 status = cpu_to_le16(icom_port->statStg->rcv[rcv_buff].flags);
         }
         icom_port->next_rcv = rcv_buff;
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(port);
 }
 
 static void process_interrupt(u16 port_int_reg,
diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c
index 4bc6e47890b4..6a6668bbb330 100644
--- a/drivers/tty/serial/ifx6x60.c
+++ b/drivers/tty/serial/ifx6x60.c
@@ -669,12 +669,8 @@ static const struct tty_operations ifx_spi_serial_ops = {
 static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev,
                                     unsigned char *chars, size_t size)
 {
-        struct tty_struct *tty = tty_port_tty_get(&ifx_dev->tty_port);
-        if (!tty)
-                return;
         tty_insert_flip_string(&ifx_dev->tty_port, chars, size);
-        tty_flip_buffer_push(tty);
-        tty_kref_put(tty);
+        tty_flip_buffer_push(&ifx_dev->tty_port);
 }
 
 /**
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index f60c4028b6e1..be26345bf6a4 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -518,7 +518,6 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
         unsigned int rx, flg, ignored = 0;
         struct tty_struct *tty = sport->port.state->port.tty;
         struct tty_port *port = &sport->port.state->port;
-        struct tty_struct *tty = port->tty;
         unsigned long flags, temp;
 
         spin_lock_irqsave(&sport->port.lock, flags);
@@ -576,7 +575,7 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 
 out:
         spin_unlock_irqrestore(&sport->port.lock, flags);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(port);
         return IRQ_HANDLED;
 }
 
diff --git a/drivers/tty/serial/ioc3_serial.c b/drivers/tty/serial/ioc3_serial.c
index edbdc4e45075..6e4c715c5d26 100644
--- a/drivers/tty/serial/ioc3_serial.c
+++ b/drivers/tty/serial/ioc3_serial.c
@@ -1393,7 +1393,6 @@ static inline int do_read(struct uart_port *the_port, char *buf, int len)
  */
 static int receive_chars(struct uart_port *the_port)
 {
-        struct tty_struct *tty;
         unsigned char ch[MAX_CHARS];
         int read_count = 0, read_room, flip = 0;
         struct uart_state *state = the_port->state;
@@ -1403,14 +1402,11 @@ static int receive_chars(struct uart_port *the_port)
         /* Make sure all the pointers are "good" ones */
         if (!state)
                 return 0;
-        if (!state->port.tty)
-                return 0;
 
         if (!(port->ip_flags & INPUT_ENABLE))
                 return 0;
 
         spin_lock_irqsave(&the_port->lock, pflags);
-        tty = state->port.tty;
 
         read_count = do_read(the_port, ch, MAX_CHARS);
         if (read_count > 0) {
@@ -1422,7 +1418,7 @@ static int receive_chars(struct uart_port *the_port)
         spin_unlock_irqrestore(&the_port->lock, pflags);
 
         if (flip)
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&state->port);
 
         return read_count;
 }
diff --git a/drivers/tty/serial/ioc4_serial.c b/drivers/tty/serial/ioc4_serial.c
index 86f64ed89b45..e2520abcb1c4 100644
--- a/drivers/tty/serial/ioc4_serial.c
+++ b/drivers/tty/serial/ioc4_serial.c
@@ -2340,7 +2340,6 @@ static inline int do_read(struct uart_port *the_port, unsigned char *buf,
  */
 static void receive_chars(struct uart_port *the_port)
 {
-        struct tty_struct *tty;
         unsigned char ch[IOC4_MAX_CHARS];
         int read_count, request_count = IOC4_MAX_CHARS;
         struct uart_icount *icount;
@@ -2350,11 +2349,8 @@ static void receive_chars(struct uart_port *the_port)
         /* Make sure all the pointers are "good" ones */
         if (!state)
                 return;
-        if (!state->port.tty)
-                return;
 
         spin_lock_irqsave(&the_port->lock, pflags);
-        tty = state->port.tty;
 
         request_count = tty_buffer_request_room(&state->port, IOC4_MAX_CHARS);
 
@@ -2369,7 +2365,7 @@ static void receive_chars(struct uart_port *the_port)
 
         spin_unlock_irqrestore(&the_port->lock, pflags);
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&state->port);
 }
 
 /**
diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c
index c9ce00dd1f8a..00f250ae14c5 100644
--- a/drivers/tty/serial/jsm/jsm_tty.c
+++ b/drivers/tty/serial/jsm/jsm_tty.c
@@ -654,7 +654,7 @@ void jsm_input(struct jsm_channel *ch)
         spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
 
         /* Tell the tty layer its okay to "eat" the data now */
-        tty_flip_buffer_push(tp);
+        tty_flip_buffer_push(port);
 
         jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, "finish\n");
 }
diff --git a/drivers/tty/serial/kgdb_nmi.c b/drivers/tty/serial/kgdb_nmi.c
index ba2ef627d9c6..26a50b0c868b 100644
--- a/drivers/tty/serial/kgdb_nmi.c
+++ b/drivers/tty/serial/kgdb_nmi.c
@@ -202,7 +202,6 @@ bool kgdb_nmi_poll_knock(void)
 static void kgdb_nmi_tty_receiver(unsigned long data)
 {
         struct kgdb_nmi_tty_priv *priv = (void *)data;
-        struct tty_struct *tty;
         char ch;
 
         tasklet_schedule(&priv->tlet);
@@ -210,16 +209,9 @@ static void kgdb_nmi_tty_receiver(unsigned long data)
         if (likely(!kgdb_nmi_tty_enabled || !kfifo_len(&priv->fifo)))
                 return;
 
-        /* Port is there, but tty might be hung up, check. */
-        tty = tty_port_tty_get(kgdb_nmi_port);
-        if (!tty)
-                return;
-
         while (kfifo_out(&priv->fifo, &ch, 1))
                 tty_insert_flip_char(&priv->port, ch, TTY_NORMAL);
-        tty_flip_buffer_push(priv->port.tty);
-
-        tty_kref_put(tty);
+        tty_flip_buffer_push(&priv->port);
 }
 
 static int kgdb_nmi_tty_activate(struct tty_port *port, struct tty_struct *tty)
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index 1933fe3c98dd..15733da757c6 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -163,21 +163,15 @@ static int
 lqasc_rx_chars(struct uart_port *port)
 {
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tty_port_tty_get(tport);
         unsigned int ch = 0, rsr = 0, fifocnt;
 
-        if (!tty) {
-                dev_dbg(port->dev, "%s:tty is busy now", __func__);
-                return -EBUSY;
-        }
-        fifocnt =
-                ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
+        fifocnt = ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
         while (fifocnt--) {
                 u8 flag = TTY_NORMAL;
                 ch = ltq_r8(port->membase + LTQ_ASC_RBUF);
                 rsr = (ltq_r32(port->membase + LTQ_ASC_STATE)
                         & ASCSTATE_ANY) | UART_DUMMY_UER_RX;
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(tport);
                 port->icount.rx++;
 
                 /*
@@ -219,9 +213,10 @@ lqasc_rx_chars(struct uart_port *port)
                          */
                         tty_insert_flip_char(tport, 0, TTY_OVERRUN);
         }
+
         if (ch != 0)
-                tty_flip_buffer_push(tty);
-        tty_kref_put(tty);
+                tty_flip_buffer_push(tport);
+
         return 0;
 }
 
diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index 5cd180564c03..c8448e6f52e5 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -259,16 +259,6 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
 {
         struct tty_port *tport = &port->state->port;
         unsigned int tmp, flag;
-        struct tty_struct *tty = tty_port_tty_get(tport);
-
-        if (!tty) {
-                /* Discard data: no tty available */
-                while (!(readl(LPC32XX_HSUART_FIFO(port->membase)) &
-                         LPC32XX_HSU_RX_EMPTY))
-                        ;
-
-                return;
-        }
 
         /* Read data from FIFO and push into terminal */
         tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
@@ -289,8 +279,7 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
 
                 tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
         }
-        tty_flip_buffer_push(tty);
-        tty_kref_put(tty);
+        tty_flip_buffer_push(tport);
 }
 
 static void __serial_lpc32xx_tx(struct uart_port *port)
@@ -367,8 +356,7 @@ static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
         /* Data received? */
         if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT)) {
                 __serial_lpc32xx_rx(port);
-                if (tty)
-                        tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(tport);
         }
 
         /* Transmit data request? */
diff --git a/drivers/tty/serial/m32r_sio.c b/drivers/tty/serial/m32r_sio.c
index 2e9a390f2ac4..bb1afa0922e1 100644
--- a/drivers/tty/serial/m32r_sio.c
+++ b/drivers/tty/serial/m32r_sio.c
@@ -301,7 +301,6 @@ static void m32r_sio_enable_ms(struct uart_port *port)
 static void receive_chars(struct uart_sio_port *up, int *status)
 {
         struct tty_port *port = &up->port.state->port;
-        struct tty_struct *tty = tport->tty;
         unsigned char ch;
         unsigned char flag;
         int max_count = 256;
@@ -369,7 +368,7 @@ static void receive_chars(struct uart_sio_port *up, int *status)
         ignore_char:
                 *status = serial_in(up, UART_LSR);
         } while ((*status & UART_LSR_DR) && (max_count-- > 0));
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(port);
 }
 
 static void transmit_chars(struct uart_sio_port *up)
diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
index e238e80cd981..791e1dfb8b11 100644
--- a/drivers/tty/serial/max3100.c
+++ b/drivers/tty/serial/max3100.c
@@ -311,8 +311,8 @@ static void max3100_work(struct work_struct *w)
                         }
                 }
 
-                if (rxchars > 16 && s->port.state->port.tty != NULL) {
-                        tty_flip_buffer_push(s->port.state->port.tty);
+                if (rxchars > 16) {
+                        tty_flip_buffer_push(&s->port.state->port);
                         rxchars = 0;
                 }
                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@@ -324,8 +324,8 @@ static void max3100_work(struct work_struct *w)
                   (!uart_circ_empty(xmit) &&
                    !uart_tx_stopped(&s->port))));
 
-        if (rxchars > 0 && s->port.state->port.tty != NULL)
-                tty_flip_buffer_push(s->port.state->port.tty);
+        if (rxchars > 0)
+                tty_flip_buffer_push(&s->port.state->port);
 }
 
 static irqreturn_t max3100_irq(int irqno, void *dev_id)
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index a801f6872cad..0c2422cb04ea 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -460,10 +460,6 @@ static int max310x_set_ref_clk(struct max310x_port *s)
 static void max310x_handle_rx(struct max310x_port *s, unsigned int rxlen)
 {
         unsigned int sts = 0, ch = 0, flag;
-        struct tty_struct *tty = tty_port_tty_get(&s->port.state->port);
-
-        if (!tty)
-                return;
 
         if (unlikely(rxlen >= MAX310X_FIFO_SIZE)) {
                 dev_warn(s->port.dev, "Possible RX FIFO overrun %d\n", rxlen);
@@ -516,9 +512,7 @@ static void max310x_handle_rx(struct max310x_port *s, unsigned int rxlen)
                                  ch, flag);
         }
 
-        tty_flip_buffer_push(tty);
-
-        tty_kref_put(tty);
+        tty_flip_buffer_push(&s->port.state->port);
 }
 
 static void max310x_handle_tx(struct max310x_port *s)
diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
index fcd56ab6053f..7ed99274572f 100644
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -310,7 +310,7 @@ static void mcf_rx_chars(struct mcf_uart *pp)
                 uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
         }
 
-        tty_flip_buffer_push(port->state->port.tty);
+        tty_flip_buffer_push(&port->state->port);
 }
 
 /****************************************************************************/
diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c
index 60d585ab4870..5f4765a7a5c5 100644
--- a/drivers/tty/serial/mfd.c
+++ b/drivers/tty/serial/mfd.c
@@ -388,12 +388,8 @@ void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
         struct hsu_dma_chan *chan = up->rxc;
         struct uart_port *port = &up->port;
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         int count;
 
-        if (!tty)
-                return;
-
         /*
          * First need to know how many is already transferred,
          * then check if its a timeout DMA irq, and return
@@ -438,7 +434,7 @@ void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
                                          | (0x1 << 16)
                                          | (0x1 << 24)  /* timeout bit, see HSU Errata 1 */
                                          );
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(tport);
 
         chan_writel(chan, HSU_CH_CR, 0x3);
 
@@ -461,13 +457,9 @@ static void serial_hsu_stop_rx(struct uart_port *port)
 
 static inline void receive_chars(struct uart_hsu_port *up, int *status)
 {
-        struct tty_struct *tty = up->port.state->port.tty;
         unsigned int ch, flag;
         unsigned int max_count = 256;
 
-        if (!tty)
-                return;
-
         do {
                 ch = serial_in(up, UART_RX);
                 flag = TTY_NORMAL;
@@ -523,7 +515,7 @@ static inline void receive_chars(struct uart_hsu_port *up, int *status)
         ignore_char:
                 *status = serial_in(up, UART_LSR);
         } while ((*status & UART_LSR_DR) && max_count--);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&up->port.state->port);
 }
 
 static void transmit_chars(struct uart_hsu_port *up)
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
index 0145aeb7721c..c0e1fad51be7 100644
--- a/drivers/tty/serial/mpc52xx_uart.c
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -942,7 +942,6 @@ static inline int
 mpc52xx_uart_int_rx_chars(struct uart_port *port)
 {
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         unsigned char ch, flag;
         unsigned short status;
 
@@ -1000,7 +999,7 @@ mpc52xx_uart_int_rx_chars(struct uart_port *port)
         }
 
         spin_unlock(&port->lock);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(tport);
         spin_lock(&port->lock);
 
         return psc_ops->raw_rx_rdy(port);
diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
index 6f2d2ceb326a..bc24f4931670 100644
--- a/drivers/tty/serial/mpsc.c
+++ b/drivers/tty/serial/mpsc.c
@@ -938,7 +938,6 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
 {
         struct mpsc_rx_desc *rxre;
         struct tty_port *port = &pi->port.state->port;
-        struct tty_struct *tty = port->tty;
         u32     cmdstat, bytes_in, i;
         int     rc = 0;
         u8      *bp;
@@ -971,7 +970,7 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
                 /* Following use of tty struct directly is deprecated */
                 if (tty_buffer_request_room(port, bytes_in) < bytes_in) {
                         if (port->low_latency)
-                                tty_flip_buffer_push(tty);
+                                tty_flip_buffer_push(port);
                         /*
                          * If this failed then we will throw away the bytes
                          * but must do so to clear interrupts.
@@ -1081,7 +1080,7 @@ next_frame:
         if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
                 mpsc_start_rx(pi);
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(port);
         return rc;
 }
 
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
index 4632db7a24b7..f641c232beca 100644
--- a/drivers/tty/serial/mrst_max3110.c
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -340,7 +340,6 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
 {
         struct uart_port *port = &max->port;
         struct tty_port *tport;
-        struct tty_struct *tty;
         char buf[M3110_RX_FIFO_DEPTH];
         int r, w, usable;
 
@@ -349,9 +348,6 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
                 return 0;
 
         tport = &port->state->port;
-        tty = tty_port_tty_get(tport);
-        if (!tty)
-                return 0;
 
         for (r = 0, w = 0; r < len; r++) {
                 if (str[r] & MAX3110_BREAK &&
@@ -366,10 +362,8 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
                 }
         }
 
-        if (!w) {
-                tty_kref_put(tty);
+        if (!w)
                 return 0;
-        }
 
         for (r = 0; w; r += usable, w -= usable) {
                 usable = tty_buffer_request_room(tport, w);
@@ -378,8 +372,7 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
                         port->icount.rx += usable;
                 }
         }
-        tty_flip_buffer_push(tty);
-        tty_kref_put(tty);
+        tty_flip_buffer_push(tport);
 
         return r;
 }
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index cb787c0e279a..b11e99797fd8 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -92,7 +92,6 @@ static void msm_enable_ms(struct uart_port *port)
 static void handle_rx_dm(struct uart_port *port, unsigned int misr)
 {
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         unsigned int sr;
         int count = 0;
         struct msm_port *msm_port = UART_TO_MSM(port);
@@ -138,7 +137,7 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
                 count -= 4;
         }
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(tport);
         if (misr & (UART_IMR_RXSTALE))
                 msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
         msm_write(port, 0xFFFFFF, UARTDM_DMRX);
@@ -148,7 +147,6 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
 static void handle_rx(struct uart_port *port)
 {
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         unsigned int sr;
 
         /*
@@ -191,7 +189,7 @@ static void handle_rx(struct uart_port *port)
                         tty_insert_flip_char(tport, c, flag);
         }
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(tport);
 }
 
 static void reset_dm_count(struct uart_port *port)
diff --git a/drivers/tty/serial/msm_serial_hs.c b/drivers/tty/serial/msm_serial_hs.c
index c356ffff3c71..4a942c78347e 100644
--- a/drivers/tty/serial/msm_serial_hs.c
+++ b/drivers/tty/serial/msm_serial_hs.c
@@ -981,9 +981,8 @@ static void msm_hs_tty_flip_buffer_work(struct work_struct *work)
 {
         struct msm_hs_port *msm_uport =
                         container_of(work, struct msm_hs_port, rx.tty_work);
-        struct tty_struct *tty = msm_uport->uport.state->port.tty;
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&msm_uport->uport.state->port);
 }
 
 /*
diff --git a/drivers/tty/serial/msm_smd_tty.c b/drivers/tty/serial/msm_smd_tty.c
index b43b4ec39269..e722ff163d91 100644
--- a/drivers/tty/serial/msm_smd_tty.c
+++ b/drivers/tty/serial/msm_smd_tty.c
@@ -80,7 +80,7 @@ static void smd_tty_notify(void *priv, unsigned event)
                         pr_err("OOPS - smd_tty_buffer mismatch?!");
                 }
 
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&info->port);
         }
 
         /* XXX only when writable and necessary */
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index 83b21686020e..7fd6aaaacd8e 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -244,7 +244,6 @@ static void mux_read(struct uart_port *port)
 {
         struct tty_port *tport = &port->state->port;
         int data;
-        struct tty_struct *tty = tport->tty;
         __u32 start_count = port->icount.rx;
 
         while(1) {
@@ -270,9 +269,8 @@ static void mux_read(struct uart_port *port)
                 tty_insert_flip_char(tport, data & 0xFF, TTY_NORMAL);
         }
         
-        if (start_count != port->icount.rx) {
-                tty_flip_buffer_push(tty);
-        }
+        if (start_count != port->icount.rx)
+                tty_flip_buffer_push(tport);
 }
 
 /**
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 37a0046ef531..df0ba32f88ad 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -364,7 +364,6 @@ out:
 
 static void mxs_auart_rx_chars(struct mxs_auart_port *s)
 {
-        struct tty_struct *tty = s->port.state->port.tty;
         u32 stat = 0;
 
         for (;;) {
@@ -375,7 +374,7 @@ static void mxs_auart_rx_chars(struct mxs_auart_port *s)
         }
 
         writel(stat, s->port.membase + AUART_STAT);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&s->port.state->port);
 }
 
 static int mxs_auart_request_port(struct uart_port *u)
@@ -458,7 +457,6 @@ static void dma_rx_callback(void *arg)
 {
         struct mxs_auart_port *s = (struct mxs_auart_port *) arg;
         struct tty_port *port = &s->port.state->port;
-        struct tty_struct *tty = port->tty;
         int count;
         u32 stat;
 
@@ -472,7 +470,7 @@ static void dma_rx_callback(void *arg)
         tty_insert_flip_string(port, s->rx_dma_buf, count);
 
         writel(stat, s->port.membase + AUART_STAT);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(port);
 
         /* start the next DMA for RX. */
         mxs_auart_dma_prep_rx(s);
diff --git a/drivers/tty/serial/netx-serial.c b/drivers/tty/serial/netx-serial.c
index d40da78e7c85..b9a40ed70be2 100644
--- a/drivers/tty/serial/netx-serial.c
+++ b/drivers/tty/serial/netx-serial.c
@@ -199,7 +199,6 @@ static void netx_txint(struct uart_port *port)
 static void netx_rxint(struct uart_port *port)
 {
         unsigned char rx, flg, status;
-        struct tty_struct *tty = port->state->port.tty;
 
         while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
                 rx = readl(port->membase + UART_DR);
@@ -237,8 +236,7 @@ static void netx_rxint(struct uart_port *port)
                 uart_insert_char(port, status, SR_OE, rx, flg);
         }
 
-        tty_flip_buffer_push(tty);
-        return;
+        tty_flip_buffer_push(&port->state->port);
 }
 
 static irqreturn_t netx_int(int irq, void *dev_id)
diff --git a/drivers/tty/serial/nwpserial.c b/drivers/tty/serial/nwpserial.c
index 10d64a3697fb..77287c54f331 100644
--- a/drivers/tty/serial/nwpserial.c
+++ b/drivers/tty/serial/nwpserial.c
@@ -129,7 +129,6 @@ static irqreturn_t nwpserial_interrupt(int irq, void *dev_id)
 {
         struct nwpserial_port *up = dev_id;
         struct tty_port *port = &up->port.state->port;
-        struct tty_struct *tty = port->tty;
         irqreturn_t ret;
         unsigned int iir;
         unsigned char ch;
@@ -150,7 +149,7 @@ static irqreturn_t nwpserial_interrupt(int irq, void *dev_id)
                         tty_insert_flip_char(port, ch, TTY_NORMAL);
         } while (dcr_read(up->dcr_host, UART_LSR) & UART_LSR_DR);
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(port);
         ret = IRQ_HANDLED;
 
         /* clear interrupt */
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index ec90651d661a..6f3dbf740f05 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -483,7 +483,6 @@ static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
 {
         struct uart_omap_port *up = dev_id;
-        struct tty_struct *tty = up->port.state->port.tty;
         unsigned int iir, lsr;
         unsigned int type;
         irqreturn_t ret = IRQ_NONE;
@@ -530,7 +529,7 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id)
 
         spin_unlock(&up->port.lock);
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&up->port.state->port);
 
         pm_runtime_mark_last_busy(up->dev);
         pm_runtime_put_autosuspend(up->dev);
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 967f1cb311f3..8b40a1fc9681 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -593,17 +593,9 @@ static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
 {
         struct uart_port *port = &priv->port;
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty;
-
-        tty = tty_port_tty_get(tport);
-        if (!tty) {
-                dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
-                return -EBUSY;
-        }
 
         tty_insert_flip_string(tport, buf, size);
-        tty_flip_buffer_push(tty);
-        tty_kref_put(tty);
+        tty_flip_buffer_push(tport);
 
         return 0;
 }
@@ -744,19 +736,12 @@ static void pch_dma_rx_complete(void *arg)
 {
         struct eg20t_port *priv = arg;
         struct uart_port *port = &priv->port;
-        struct tty_struct *tty = tty_port_tty_get(&port->state->port);
         int count;
 
-        if (!tty) {
-                dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
-                return;
-        }
-
         dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
         count = dma_push_rx(priv, priv->trigger_level);
         if (count)
-                tty_flip_buffer_push(tty);
-        tty_kref_put(tty);
+                tty_flip_buffer_push(&port->state->port);
         async_tx_ack(priv->desc_rx);
         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
                                             PCH_UART_HAL_RX_ERR_INT);
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 73a3f295e7c4..b1785f58b6e3 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -227,21 +227,19 @@ static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
         write_zsreg(uap, R1, uap->curregs[1]);
 }
 
-static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
+static bool pmz_receive_chars(struct uart_pmac_port *uap)
 {
         struct tty_port *port;
-        struct tty_struct *tty = NULL;
         unsigned char ch, r1, drop, error, flag;
         int loops = 0;
 
         /* Sanity check, make sure the old bug is no longer happening */
-        if (uap->port.state == NULL || uap->port.state->port.tty == NULL) {
+        if (uap->port.state == NULL) {
                 WARN_ON(1);
                 (void)read_zsdata(uap);
-                return NULL;
+                return false;
         }
         port = &uap->port.state->port;
-        tty = port->tty; /* TOCTOU above */
 
         while (1) {
                 error = 0;
@@ -330,11 +328,11 @@ static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
                         break;
         }
 
-        return tty;
+        return true;
  flood:
         pmz_interrupt_control(uap, 0);
         pmz_error("pmz: rx irq flood !\n");
-        return tty;
+        return true;
 }
 
 static void pmz_status_handle(struct uart_pmac_port *uap)
@@ -455,7 +453,7 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
         struct uart_pmac_port *uap_a;
         struct uart_pmac_port *uap_b;
         int rc = IRQ_NONE;
-        struct tty_struct *tty;
+        bool push;
         u8 r3;
 
         uap_a = pmz_get_port_A(uap);
@@ -468,7 +466,7 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
         pmz_debug("irq, r3: %x\n", r3);
 #endif
         /* Channel A */
-        tty = NULL;
+        push = false;
         if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
                 if (!ZS_IS_OPEN(uap_a)) {
                         pmz_debug("ChanA interrupt while not open !\n");
@@ -479,21 +477,21 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
                 if (r3 & CHAEXT)
                         pmz_status_handle(uap_a);
                 if (r3 & CHARxIP)
-                        tty = pmz_receive_chars(uap_a);
+                        push = pmz_receive_chars(uap_a);
                 if (r3 & CHATxIP)
                         pmz_transmit_chars(uap_a);
                 rc = IRQ_HANDLED;
         }
  skip_a:
         spin_unlock(&uap_a->port.lock);
-        if (tty != NULL)
-                tty_flip_buffer_push(tty);
+        if (push)
+                tty_flip_buffer_push(&uap->port.state->port);
 
         if (!uap_b)
                 goto out;
 
         spin_lock(&uap_b->port.lock);
-        tty = NULL;
+        push = false;
         if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
                 if (!ZS_IS_OPEN(uap_b)) {
                         pmz_debug("ChanB interrupt while not open !\n");
@@ -504,15 +502,15 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
                 if (r3 & CHBEXT)
                         pmz_status_handle(uap_b);
                 if (r3 & CHBRxIP)
-                        tty = pmz_receive_chars(uap_b);
+                        push = pmz_receive_chars(uap_b);
                 if (r3 & CHBTxIP)
                         pmz_transmit_chars(uap_b);
                 rc = IRQ_HANDLED;
         }
  skip_b:
         spin_unlock(&uap_b->port.lock);
-        if (tty != NULL)
-                tty_flip_buffer_push(tty);
+        if (push)
+                tty_flip_buffer_push(&uap->port.state->port);
 
  out:
         return rc;
diff --git a/drivers/tty/serial/pnx8xxx_uart.c b/drivers/tty/serial/pnx8xxx_uart.c
index 0aa75a97531c..7e277a5384a7 100644
--- a/drivers/tty/serial/pnx8xxx_uart.c
+++ b/drivers/tty/serial/pnx8xxx_uart.c
@@ -181,7 +181,6 @@ static void pnx8xxx_enable_ms(struct uart_port *port)
 
 static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
 {
-        struct tty_struct *tty = sport->port.state->port.tty;
         unsigned int status, ch, flg;
 
         status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
@@ -238,7 +237,7 @@ static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
                 status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
                          ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
         }
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&sport->port.state->port);
 }
 
 static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport)
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 2764828251f5..3b671bc3f966 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -98,7 +98,6 @@ static void serial_pxa_stop_rx(struct uart_port *port)
 
 static inline void receive_chars(struct uart_pxa_port *up, int *status)
 {
-        struct tty_struct *tty = up->port.state->port.tty;
         unsigned int ch, flag;
         int max_count = 256;
 
@@ -168,7 +167,7 @@ static inline void receive_chars(struct uart_pxa_port *up, int *status)
         ignore_char:
                 *status = serial_in(up, UART_LSR);
         } while ((*status & UART_LSR_DR) && (max_count-- > 0));
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&up->port.state->port);
 
         /* work around Errata #20 according to
          * Intel(R) PXA27x Processor Family
diff --git a/drivers/tty/serial/sa1100.c b/drivers/tty/serial/sa1100.c
index 5d4b9b449b4a..af6b3e3ad24d 100644
--- a/drivers/tty/serial/sa1100.c
+++ b/drivers/tty/serial/sa1100.c
@@ -188,7 +188,6 @@ static void sa1100_enable_ms(struct uart_port *port)
 static void
 sa1100_rx_chars(struct sa1100_port *sport)
 {
-        struct tty_struct *tty = sport->port.state->port.tty;
         unsigned int status, ch, flg;
 
         status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
@@ -233,7 +232,7 @@ sa1100_rx_chars(struct sa1100_port *sport)
                 status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
                          UTSR0_TO_SM(UART_GET_UTSR0(sport));
         }
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&sport->port.state->port);
 }
 
 static void sa1100_tx_chars(struct sa1100_port *sport)
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 0684529eb2ad..3aa3c4c83f8b 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -220,7 +220,6 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id)
 {
         struct s3c24xx_uart_port *ourport = dev_id;
         struct uart_port *port = &ourport->port;
-        struct tty_struct *tty = port->state->port.tty;
         unsigned int ufcon, ch, flag, ufstat, uerstat;
         unsigned long flags;
         int max_count = 64;
@@ -298,7 +297,7 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id)
  ignore_char:
                 continue;
         }
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&port->state->port);
 
  out:
         spin_unlock_irqrestore(&port->lock, flags);
diff --git a/drivers/tty/serial/sb1250-duart.c b/drivers/tty/serial/sb1250-duart.c
index f76b1688c5c8..a7cdec2962dd 100644
--- a/drivers/tty/serial/sb1250-duart.c
+++ b/drivers/tty/serial/sb1250-duart.c
@@ -384,7 +384,7 @@ static void sbd_receive_chars(struct sbd_port *sport)
                 uart_insert_char(uport, status, M_DUART_OVRUN_ERR, ch, flag);
         }
 
-        tty_flip_buffer_push(uport->state->port.tty);
+        tty_flip_buffer_push(&uport->state->port);
 }
 
 static void sbd_transmit_chars(struct sbd_port *sport)
diff --git a/drivers/tty/serial/sc26xx.c b/drivers/tty/serial/sc26xx.c
index 0cd0e4ac12a6..c9735680762d 100644
--- a/drivers/tty/serial/sc26xx.c
+++ b/drivers/tty/serial/sc26xx.c
@@ -136,20 +136,17 @@ static void sc26xx_disable_irq(struct uart_port *port, int mask)
         WRITE_SC(port, IMR, up->imr);
 }
 
-static struct tty_struct *receive_chars(struct uart_port *port)
+static bool receive_chars(struct uart_port *port)
 {
         struct tty_port *tport = NULL;
-        struct tty_struct *tty = NULL;
         int limit = 10000;
         unsigned char ch;
         char flag;
         u8 status;
 
         /* FIXME what is this trying to achieve? */
-        if (port->state != NULL) {              /* Unopened serial console */
+        if (port->state != NULL)                /* Unopened serial console */
                 tport = &port->state->port;
-                tty = tport->tty;
-        }
 
         while (limit-- > 0) {
                 status = READ_SC_PORT(port, SR);
@@ -191,7 +188,7 @@ static struct tty_struct *receive_chars(struct uart_port *port)
 
                 tty_insert_flip_char(tport, ch, flag);
         }
-        return tty;
+        return !!tport;
 }
 
 static void transmit_chars(struct uart_port *port)
@@ -221,36 +218,36 @@ static void transmit_chars(struct uart_port *port)
 static irqreturn_t sc26xx_interrupt(int irq, void *dev_id)
 {
         struct uart_sc26xx_port *up = dev_id;
-        struct tty_struct *tty;
         unsigned long flags;
+        bool push;
         u8 isr;
 
         spin_lock_irqsave(&up->port[0].lock, flags);
 
-        tty = NULL;
+        push = false;
         isr = READ_SC(&up->port[0], ISR);
         if (isr & ISR_TXRDYA)
             transmit_chars(&up->port[0]);
         if (isr & ISR_RXRDYA)
-            tty = receive_chars(&up->port[0]);
+            push = receive_chars(&up->port[0]);
 
         spin_unlock(&up->port[0].lock);
 
-        if (tty)
-                tty_flip_buffer_push(tty);
+        if (push)
+                tty_flip_buffer_push(&up->port[0].state->port);
 
         spin_lock(&up->port[1].lock);
 
-        tty = NULL;
+        push = false;
         if (isr & ISR_TXRDYB)
             transmit_chars(&up->port[1]);
         if (isr & ISR_RXRDYB)
-            tty = receive_chars(&up->port[1]);
+            push = receive_chars(&up->port[1]);
 
         spin_unlock_irqrestore(&up->port[1].lock, flags);
 
-        if (tty)
-                tty_flip_buffer_push(tty);
+        if (push)
+                tty_flip_buffer_push(&up->port[1].state->port);
 
         return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c
index 418b495e3233..2ced871becff 100644
--- a/drivers/tty/serial/sccnxp.c
+++ b/drivers/tty/serial/sccnxp.c
@@ -285,10 +285,6 @@ static void sccnxp_handle_rx(struct uart_port *port)
 {
         u8 sr;
         unsigned int ch, flag;
-        struct tty_struct *tty = tty_port_tty_get(&port->state->port);
-
-        if (!tty)
-                return;
 
         for (;;) {
                 sr = sccnxp_port_read(port, SCCNXP_SR_REG);
@@ -333,9 +329,7 @@ static void sccnxp_handle_rx(struct uart_port *port)
                 uart_insert_char(port, sr, SR_OVR, ch, flag);
         }
 
-        tty_flip_buffer_push(tty);
-
-        tty_kref_put(tty);
+        tty_flip_buffer_push(&port->state->port);
 }
 
 static void sccnxp_handle_tx(struct uart_port *port)
diff --git a/drivers/tty/serial/serial_ks8695.c b/drivers/tty/serial/serial_ks8695.c
index 9bd004f9da89..e1caa99e3d3b 100644
--- a/drivers/tty/serial/serial_ks8695.c
+++ b/drivers/tty/serial/serial_ks8695.c
@@ -153,7 +153,6 @@ static void ks8695uart_disable_ms(struct uart_port *port)
 static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
 {
         struct uart_port *port = dev_id;
-        struct tty_struct *tty = port->state->port.tty;
         unsigned int status, ch, lsr, flg, max_count = 256;
 
         status = UART_GET_LSR(port);            /* clears pending LSR interrupts */
@@ -200,7 +199,7 @@ static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
 ignore_char:
                 status = UART_GET_LSR(port);
         }
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&port->state->port);
 
         return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index b52b21aeb250..fe48a0c2b4ca 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -277,7 +277,6 @@ static void serial_txx9_initialize(struct uart_port *port)
 static inline void
 receive_chars(struct uart_txx9_port *up, unsigned int *status)
 {
-        struct tty_struct *tty = up->port.state->port.tty;
         unsigned char ch;
         unsigned int disr = *status;
         int max_count = 256;
@@ -346,7 +345,7 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
                 disr = sio_in(up, TXX9_SIDISR);
         } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
         spin_unlock(&up->port.lock);
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&up->port.state->port);
         spin_lock(&up->port.lock);
         *status = disr;
 }
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index ecef748f5385..156418619949 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -597,7 +597,6 @@ static void sci_receive_chars(struct uart_port *port)
 {
         struct sci_port *sci_port = to_sci_port(port);
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         int i, count, copied = 0;
         unsigned short status;
         unsigned char flag;
@@ -675,7 +674,7 @@ static void sci_receive_chars(struct uart_port *port)
 
         if (copied) {
                 /* Tell the rest of the system the news. New characters! */
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(tport);
         } else {
                 serial_port_in(port, SCxSR); /* dummy read */
                 serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
@@ -722,7 +721,6 @@ static int sci_handle_errors(struct uart_port *port)
         int copied = 0;
         unsigned short status = serial_port_in(port, SCxSR);
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         struct sci_port *s = to_sci_port(port);
 
         /*
@@ -783,7 +781,7 @@ static int sci_handle_errors(struct uart_port *port)
         }
 
         if (copied)
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(tport);
 
         return copied;
 }
@@ -791,7 +789,6 @@ static int sci_handle_errors(struct uart_port *port)
 static int sci_handle_fifo_overrun(struct uart_port *port)
 {
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         struct sci_port *s = to_sci_port(port);
         struct plat_sci_reg *reg;
         int copied = 0;
@@ -806,7 +803,7 @@ static int sci_handle_fifo_overrun(struct uart_port *port)
                 port->icount.overrun++;
 
                 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(tport);
 
                 dev_notice(port->dev, "overrun error\n");
                 copied++;
@@ -820,7 +817,6 @@ static int sci_handle_breaks(struct uart_port *port)
         int copied = 0;
         unsigned short status = serial_port_in(port, SCxSR);
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         struct sci_port *s = to_sci_port(port);
 
         if (uart_handle_break(port))
@@ -842,7 +838,7 @@ static int sci_handle_breaks(struct uart_port *port)
         }
 
         if (copied)
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(tport);
 
         copied += sci_handle_fifo_overrun(port);
 
@@ -1299,7 +1295,6 @@ static void sci_dma_rx_complete(void *arg)
 {
         struct sci_port *s = arg;
         struct uart_port *port = &s->port;
-        struct tty_struct *tty = port->state->port.tty;
         unsigned long flags;
         int count;
 
@@ -1314,7 +1309,7 @@ static void sci_dma_rx_complete(void *arg)
         spin_unlock_irqrestore(&port->lock, flags);
 
         if (count)
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&port->state->port);
 
         schedule_work(&s->work_rx);
 }
@@ -1408,7 +1403,6 @@ static void work_fn_rx(struct work_struct *work)
         if (dma_async_is_tx_complete(s->chan_rx, s->active_rx, NULL, NULL) !=
             DMA_SUCCESS) {
                 /* Handle incomplete DMA receive */
-                struct tty_struct *tty = port->state->port.tty;
                 struct dma_chan *chan = s->chan_rx;
                 struct shdma_desc *sh_desc = container_of(desc,
                                         struct shdma_desc, async_tx);
@@ -1424,7 +1418,7 @@ static void work_fn_rx(struct work_struct *work)
                 spin_unlock_irqrestore(&port->lock, flags);
 
                 if (count)
-                        tty_flip_buffer_push(tty);
+                        tty_flip_buffer_push(&port->state->port);
 
                 sci_submit_rx(s);
 
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 142217cd01f4..8f3d6c091acc 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -206,11 +206,6 @@ static unsigned int
 sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
 {
         unsigned int ch, rx_count = 0;
-        struct tty_struct *tty;
-
-        tty = tty_port_tty_get(&port->state->port);
-        if (!tty)
-                return -ENODEV;
 
         while (!(rd_regl(port, SIRFUART_RX_FIFO_STATUS) &
                                         SIRFUART_FIFOEMPTY_MASK(port))) {
@@ -224,8 +219,7 @@ sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
         }
 
         port->icount.rx += rx_count;
-        tty_flip_buffer_push(tty);
-        tty_kref_put(tty);
+        tty_flip_buffer_push(&port->state->port);
 
         return rx_count;
 }
diff --git a/drivers/tty/serial/sn_console.c b/drivers/tty/serial/sn_console.c
index 283232c64656..f51ffdc696fd 100644
--- a/drivers/tty/serial/sn_console.c
+++ b/drivers/tty/serial/sn_console.c
@@ -459,7 +459,6 @@ sn_receive_chars(struct sn_cons_port *port, unsigned long flags)
 {
         struct tty_port *tport = NULL;
         int ch;
-        struct tty_struct *tty;
 
         if (!port) {
                 printk(KERN_ERR "sn_receive_chars - port NULL so can't receive\n");
@@ -474,11 +473,6 @@ sn_receive_chars(struct sn_cons_port *port, unsigned long flags)
         if (port->sc_port.state) {
                 /* The serial_core stuffs are initialized, use them */
                 tport = &port->sc_port.state->port;
-                tty = tport->tty;
-        }
-        else {
-                /* Not registered yet - can't pass to tty layer.  */
-                tty = NULL;
         }
 
         while (port->sc_ops->sal_input_pending()) {
@@ -518,15 +512,15 @@ sn_receive_chars(struct sn_cons_port *port, unsigned long flags)
 #endif /* CONFIG_MAGIC_SYSRQ */
 
                 /* record the character to pass up to the tty layer */
-                if (tty) {
+                if (tport) {
                         if (tty_insert_flip_char(tport, ch, TTY_NORMAL) == 0)
                                 break;
                 }
                 port->sc_port.icount.rx++;
         }
 
-        if (tty)
-                tty_flip_buffer_push(tty);
+        if (tport)
+                tty_flip_buffer_push(tport);
 }
 
 /**
diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c
index defe92b19e16..ba60708053e0 100644
--- a/drivers/tty/serial/sunhv.c
+++ b/drivers/tty/serial/sunhv.c
@@ -181,17 +181,17 @@ static struct sunhv_ops bywrite_ops = {
 
 static struct sunhv_ops *sunhv_ops = &bychar_ops;
 
-static struct tty_struct *receive_chars(struct uart_port *port)
+static struct tty_port *receive_chars(struct uart_port *port)
 {
-        struct tty_struct *tty = NULL;
+        struct tty_port *tport = NULL;
 
         if (port->state != NULL)                /* Unopened serial console */
-                tty = port->state->port.tty;
+                tport = &port->state->port;
 
         if (sunhv_ops->receive_chars(port))
                 sun_do_break();
 
-        return tty;
+        return tport;
 }
 
 static void transmit_chars(struct uart_port *port)
@@ -214,16 +214,16 @@ static void transmit_chars(struct uart_port *port)
 static irqreturn_t sunhv_interrupt(int irq, void *dev_id)
 {
         struct uart_port *port = dev_id;
-        struct tty_struct *tty;
+        struct tty_port *tport;
         unsigned long flags;
 
         spin_lock_irqsave(&port->lock, flags);
-        tty = receive_chars(port);
+        tport = receive_chars(port);
         transmit_chars(port);
         spin_unlock_irqrestore(&port->lock, flags);
 
-        if (tty)
-                tty_flip_buffer_push(tty);
+        if (tport)
+                tty_flip_buffer_push(tport);
 
         return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c
index 4abc4d43a8e8..8de2213664e0 100644
--- a/drivers/tty/serial/sunsab.c
+++ b/drivers/tty/serial/sunsab.c
@@ -107,22 +107,19 @@ static __inline__ void sunsab_cec_wait(struct uart_sunsab_port *up)
                 udelay(1);
 }
 
-static struct tty_struct *
+static struct tty_port *
 receive_chars(struct uart_sunsab_port *up,
               union sab82532_irq_status *stat)
 {
         struct tty_port *port = NULL;
-        struct tty_struct *tty = NULL;
         unsigned char buf[32];
         int saw_console_brk = 0;
         int free_fifo = 0;
         int count = 0;
         int i;
 
-        if (up->port.state != NULL) {           /* Unopened serial console */
+        if (up->port.state != NULL)             /* Unopened serial console */
                 port = &up->port.state->port;
-                tty = port->tty;
-        }
 
         /* Read number of BYTES (Character + Status) available. */
         if (stat->sreg.isr0 & SAB82532_ISR0_RPF) {
@@ -139,7 +136,7 @@ receive_chars(struct uart_sunsab_port *up,
         if (stat->sreg.isr0 & SAB82532_ISR0_TIME) {
                 sunsab_cec_wait(up);
                 writeb(SAB82532_CMDR_RFRD, &up->regs->w.cmdr);
-                return tty;
+                return port;
         }
 
         if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
@@ -219,7 +216,7 @@ receive_chars(struct uart_sunsab_port *up,
         if (saw_console_brk)
                 sun_do_break();
 
-        return tty;
+        return port;
 }
 
 static void sunsab_stop_tx(struct uart_port *);
@@ -302,7 +299,7 @@ static void check_status(struct uart_sunsab_port *up,
 static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
 {
         struct uart_sunsab_port *up = dev_id;
-        struct tty_struct *tty;
+        struct tty_port *port = NULL;
         union sab82532_irq_status status;
         unsigned long flags;
         unsigned char gis;
@@ -316,12 +313,11 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
         if (gis & 2)
                 status.sreg.isr1 = readb(&up->regs->r.isr1);
 
-        tty = NULL;
         if (status.stat) {
                 if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
                                          SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
                     (status.sreg.isr1 & SAB82532_ISR1_BRK))
-                        tty = receive_chars(up, &status);
+                        port = receive_chars(up, &status);
                 if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
                     (status.sreg.isr1 & SAB82532_ISR1_CSC))
                         check_status(up, &status);
@@ -331,8 +327,8 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
 
         spin_unlock_irqrestore(&up->port.lock, flags);
 
-        if (tty)
-                tty_flip_buffer_push(tty);
+        if (port)
+                tty_flip_buffer_push(port);
 
         return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
index 52325968b06c..e343d6670854 100644
--- a/drivers/tty/serial/sunsu.c
+++ b/drivers/tty/serial/sunsu.c
@@ -315,11 +315,10 @@ static void sunsu_enable_ms(struct uart_port *port)
         spin_unlock_irqrestore(&up->port.lock, flags);
 }
 
-static struct tty_struct *
+static void
 receive_chars(struct uart_sunsu_port *up, unsigned char *status)
 {
         struct tty_port *port = &up->port.state->port;
-        struct tty_struct *tty = port->tty;
         unsigned char ch, flag;
         int max_count = 256;
         int saw_console_brk = 0;
@@ -391,8 +390,6 @@ receive_chars(struct uart_sunsu_port *up, unsigned char *status)
 
         if (saw_console_brk)
                 sun_do_break();
-
-        return tty;
 }
 
 static void transmit_chars(struct uart_sunsu_port *up)
@@ -461,20 +458,16 @@ static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
         spin_lock_irqsave(&up->port.lock, flags);
 
         do {
-                struct tty_struct *tty;
-
                 status = serial_inp(up, UART_LSR);
-                tty = NULL;
                 if (status & UART_LSR_DR)
-                        tty = receive_chars(up, &status);
+                        receive_chars(up, &status);
                 check_modem_status(up);
                 if (status & UART_LSR_THRE)
                         transmit_chars(up);
 
                 spin_unlock_irqrestore(&up->port.lock, flags);
 
-                if (tty)
-                        tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&up->port.state->port);
 
                 spin_lock_irqsave(&up->port.lock, flags);
 
diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
index 4a11be3849f6..27669ff3d446 100644
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -323,19 +323,15 @@ static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
         }
 }
 
-static struct tty_struct *
+static struct tty_port *
 sunzilog_receive_chars(struct uart_sunzilog_port *up,
                        struct zilog_channel __iomem *channel)
 {
         struct tty_port *port = NULL;
-        struct tty_struct *tty;
         unsigned char ch, r1, flag;
 
-        tty = NULL;
-        if (up->port.state != NULL) {           /* Unopened serial console */
+        if (up->port.state != NULL)             /* Unopened serial console */
                 port = &up->port.state->port;
-                tty = port->tty;                /* mouse => tty is NULL */
-        }
 
         for (;;) {
 
@@ -403,7 +399,7 @@ sunzilog_receive_chars(struct uart_sunzilog_port *up,
                         tty_insert_flip_char(port, 0, TTY_OVERRUN);
         }
 
-        return tty;
+        return port;
 }
 
 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
@@ -536,21 +532,21 @@ static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
         while (up) {
                 struct zilog_channel __iomem *channel
                         = ZILOG_CHANNEL_FROM_PORT(&up->port);
-                struct tty_struct *tty;
+                struct tty_port *port;
                 unsigned char r3;
 
                 spin_lock(&up->port.lock);
                 r3 = read_zsreg(channel, R3);
 
                 /* Channel A */
-                tty = NULL;
+                port = NULL;
                 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
                         writeb(RES_H_IUS, &channel->control);
                         ZSDELAY();
                         ZS_WSYNC(channel);
 
                         if (r3 & CHARxIP)
-                                tty = sunzilog_receive_chars(up, channel);
+                                port = sunzilog_receive_chars(up, channel);
                         if (r3 & CHAEXT)
                                 sunzilog_status_handle(up, channel);
                         if (r3 & CHATxIP)
@@ -558,22 +554,22 @@ static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
                 }
                 spin_unlock(&up->port.lock);
 
-                if (tty)
-                        tty_flip_buffer_push(tty);
+                if (port)
+                        tty_flip_buffer_push(port);
 
                 /* Channel B */
                 up = up->next;
                 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
 
                 spin_lock(&up->port.lock);
-                tty = NULL;
+                port = NULL;
                 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
                         writeb(RES_H_IUS, &channel->control);
                         ZSDELAY();
                         ZS_WSYNC(channel);
 
                         if (r3 & CHBRxIP)
-                                tty = sunzilog_receive_chars(up, channel);
+                                port = sunzilog_receive_chars(up, channel);
                         if (r3 & CHBEXT)
                                 sunzilog_status_handle(up, channel);
                         if (r3 & CHBTxIP)
@@ -581,8 +577,8 @@ static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
                 }
                 spin_unlock(&up->port.lock);
 
-                if (tty)
-                        tty_flip_buffer_push(tty);
+                if (port)
+                        tty_flip_buffer_push(port);
 
                 up = up->next;
         }
diff --git a/drivers/tty/serial/timbuart.c b/drivers/tty/serial/timbuart.c
index f40c634f7528..6818410a2bea 100644
--- a/drivers/tty/serial/timbuart.c
+++ b/drivers/tty/serial/timbuart.c
@@ -100,7 +100,7 @@ static void timbuart_rx_chars(struct uart_port *port)
         }
 
         spin_unlock(&port->lock);
-        tty_flip_buffer_push(port->state->port.tty);
+        tty_flip_buffer_push(tport);
         spin_lock(&port->lock);
 
         dev_dbg(port->dev, "%s - total read %d bytes\n",
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index 5caf1f0ebc82..5486505e87c7 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -156,7 +156,7 @@ static irqreturn_t ulite_isr(int irq, void *dev_id)
 
         /* work done? */
         if (n > 1) {
-                tty_flip_buffer_push(port->state->port.tty);
+                tty_flip_buffer_push(&port->state->port);
                 return IRQ_HANDLED;
         } else {
                 return IRQ_NONE;
diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
index 7a2378627fa5..7355303dad99 100644
--- a/drivers/tty/serial/ucc_uart.c
+++ b/drivers/tty/serial/ucc_uart.c
@@ -470,7 +470,6 @@ static void qe_uart_int_rx(struct uart_qe_port *qe_port)
         unsigned char ch, *cp;
         struct uart_port *port = &qe_port->port;
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tport->tty;
         struct qe_bd *bdp;
         u16 status;
         unsigned int flg;
@@ -531,7 +530,7 @@ error_return:
         qe_port->rx_cur = bdp;
 
         /* Activate BH processing */
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(tport);
 
         return;
 
diff --git a/drivers/tty/serial/vr41xx_siu.c b/drivers/tty/serial/vr41xx_siu.c
index 62ee0166bc65..f655997f44af 100644
--- a/drivers/tty/serial/vr41xx_siu.c
+++ b/drivers/tty/serial/vr41xx_siu.c
@@ -313,12 +313,10 @@ static void siu_break_ctl(struct uart_port *port, int ctl)
 
 static inline void receive_chars(struct uart_port *port, uint8_t *status)
 {
-        struct tty_struct *tty;
         uint8_t lsr, ch;
         char flag;
         int max_count = RX_MAX_COUNT;
 
-        tty = port->state->port.tty;
         lsr = *status;
 
         do {
@@ -365,7 +363,7 @@ static inline void receive_chars(struct uart_port *port, uint8_t *status)
                 lsr = siu_read(port, UART_LSR);
         } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
 
-        tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&port->state->port);
 
         *status = lsr;
 }
diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
index 7f4112423f3d..f1a398c672fa 100644
--- a/drivers/tty/serial/vt8500_serial.c
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -137,15 +137,6 @@ static void vt8500_enable_ms(struct uart_port *port)
 static void handle_rx(struct uart_port *port)
 {
         struct tty_port *tport = &port->state->port;
-        struct tty_struct *tty = tty_port_tty_get(tport);
-        if (!tty) {
-                /* Discard data: no tty available */
-                int count = (vt8500_read(port, VT8500_URFIDX) & 0x1f00) >> 8;
-                u16 ch;
-                while (count--)
-                        ch = readw(port->membase + VT8500_RXFIFO);
-                return;
-        }
 
         /*
          * Handle overrun
@@ -178,8 +169,7 @@ static void handle_rx(struct uart_port *port)
                         tty_insert_flip_char(tport, c, flag);
         }
 
-        tty_flip_buffer_push(tty);
-        tty_kref_put(tty);
+        tty_flip_buffer_push(tport);
 }
 
 static void handle_tx(struct uart_port *port)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 9ab910370c56..82a3151e393c 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -147,15 +147,11 @@
 static irqreturn_t xuartps_isr(int irq, void *dev_id)
 {
         struct uart_port *port = (struct uart_port *)dev_id;
-        struct tty_struct *tty;
         unsigned long flags;
         unsigned int isrstatus, numbytes;
         unsigned int data;
         char status = TTY_NORMAL;
 
-        /* Get the tty which could be NULL so don't assume it's valid */
-        tty = tty_port_tty_get(&port->state->port);
-
         spin_lock_irqsave(&port->lock, flags);
 
         /* Read the interrupt status register to determine which
@@ -187,14 +183,11 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
                         } else if (isrstatus & XUARTPS_IXR_OVERRUN)
                                 port->icount.overrun++;
 
-                        if (tty)
-                                uart_insert_char(port, isrstatus,
-                                                XUARTPS_IXR_OVERRUN, data,
-                                                status);
+                        uart_insert_char(port, isrstatus, XUARTPS_IXR_OVERRUN,
+                                        data, status);
                 }
                 spin_unlock(&port->lock);
-                if (tty)
-                        tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&port->state->port);
                 spin_lock(&port->lock);
         }
 
@@ -237,7 +230,6 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 
         /* be sure to release the lock and tty before leaving */
         spin_unlock_irqrestore(&port->lock, flags);
-        tty_kref_put(tty);
 
         return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/zs.c b/drivers/tty/serial/zs.c
index 92c00b24d0df..6a169877109b 100644
--- a/drivers/tty/serial/zs.c
+++ b/drivers/tty/serial/zs.c
@@ -603,7 +603,7 @@ static void zs_receive_chars(struct zs_port *zport)
                 uart_insert_char(uport, status, Rx_OVR, ch, flag);
         }
 
-        tty_flip_buffer_push(uport->state->port.tty);
+        tty_flip_buffer_push(&uport->state->port);
 }
 
 static void zs_raw_transmit_chars(struct zs_port *zport)
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 2f6967d61a80..555fdc0ed0f1 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -1439,7 +1439,6 @@ static void mgsl_isr_receive_data( struct mgsl_struct *info )
         u16 status;
         int work = 0;
         unsigned char DataByte;
-        struct tty_struct *tty = info->port.tty;
         struct  mgsl_icount *icount = &info->icount;
         
         if ( debug_level >= DEBUG_LEVEL_ISR )   
@@ -1501,7 +1500,7 @@ static void mgsl_isr_receive_data( struct mgsl_struct *info )
                         if (status & RXSTATUS_BREAK_RECEIVED) {
                                 flag = TTY_BREAK;
                                 if (info->port.flags & ASYNC_SAK)
-                                        do_SAK(tty);
+                                        do_SAK(info->port.tty);
                         } else if (status & RXSTATUS_PARITY_ERROR)
                                 flag = TTY_PARITY;
                         else if (status & RXSTATUS_FRAMING_ERROR)
@@ -1524,7 +1523,7 @@ static void mgsl_isr_receive_data( struct mgsl_struct *info )
         }
                         
         if(work)
-                tty_flip_buffer_push(tty);
+                tty_flip_buffer_push(&info->port);
 }
 
 /* mgsl_isr_misc()
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index 9a0358a1e0dd..fced6acc74ee 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -1854,7 +1854,6 @@ static void hdlcdev_exit(struct slgt_info *info)
  */
 static void rx_async(struct slgt_info *info)
 {
-        struct tty_struct *tty = info->port.tty;
         struct mgsl_icount *icount = &info->icount;
         unsigned int start, end;
         unsigned char *p;
@@ -1915,8 +1914,8 @@ static void rx_async(struct slgt_info *info)
                         break;
         }
 
-        if (tty && chars)
-                tty_flip_buffer_push(tty);
+        if (chars)
+                tty_flip_buffer_push(&info->port);
 }
 
 /*
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index 419f58ff4a13..e4a2904af565 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -2167,7 +2167,6 @@ static void isr_rxrdy(SLMP_INFO * info)
 {
         u16 status;
         unsigned char DataByte;
-        struct tty_struct *tty = info->port.tty;
         struct  mgsl_icount *icount = &info->icount;
 
         if ( debug_level >= DEBUG_LEVEL_ISR )
@@ -2225,8 +2224,7 @@ static void isr_rxrdy(SLMP_INFO * info)
                         icount->frame,icount->overrun);
         }
 
-        if ( tty )
-                tty_flip_buffer_push(tty);
+        tty_flip_buffer_push(&info->port);
 }
 
 static void isr_txeom(SLMP_INFO * info, unsigned char status)
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 1bfe97a8e2eb..b6efacadf23b 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -544,7 +544,7 @@ void tty_flush_to_ldisc(struct tty_struct *tty)
 
 /**
  *      tty_flip_buffer_push    -       terminal
- *      @tty: tty to push
+ *      @port: tty port to push
  *
  *      Queue a push of the terminal flip buffers to the line discipline. This
  *      function must not be called from IRQ context if port->low_latency is
@@ -556,9 +556,9 @@ void tty_flush_to_ldisc(struct tty_struct *tty)
  *      Locking: tty buffer lock. Driver locks in low latency mode.
  */
 
-void tty_flip_buffer_push(struct tty_struct *tty)
+void tty_flip_buffer_push(struct tty_port *port)
 {
-        struct tty_bufhead *buf = &tty->port->buf;
+        struct tty_bufhead *buf = &port->buf;
         unsigned long flags;
 
         spin_lock_irqsave(&buf->lock, flags);
@@ -566,7 +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->port->low_latency)
+        if (port->low_latency)
                 flush_to_ldisc(&buf->work);
         else
                 schedule_work(&buf->work);