TTY: switch tty_schedule_flip

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.

This is the last one: tty_schedule_flip

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

11 files changed, 51 insertions, 100 deletions

diff --git a/arch/alpha/kernel/srmcons.c b/arch/alpha/kernel/srmcons.c
index 21b57a66e809..6f01d9ad7b81 100644
--- a/arch/alpha/kernel/srmcons.c
+++ b/arch/alpha/kernel/srmcons.c
@@ -44,9 +44,8 @@ typedef union _srmcons_result {
 
 /* called with callback_lock held */
 static int
-srmcons_do_receive_chars(struct tty_struct *tty)
+srmcons_do_receive_chars(struct tty_port *port)
 {
-        struct tty_port *port = tty->port;
         srmcons_result result;
         int count = 0, loops = 0;
 
@@ -59,7 +58,7 @@ srmcons_do_receive_chars(struct tty_struct *tty)
         } while((result.bits.status & 1) && (++loops < 10));
 
         if (count)
-                tty_schedule_flip(tty);
+                tty_schedule_flip(port);
 
         return count;
 }
@@ -74,7 +73,7 @@ srmcons_receive_chars(unsigned long data)
 
         local_irq_save(flags);
         if (spin_trylock(&srmcons_callback_lock)) {
-                if (!srmcons_do_receive_chars(port->tty))
+                if (!srmcons_do_receive_chars(port))
                         incr = 100;
                 spin_unlock(&srmcons_callback_lock);
         } 
@@ -89,7 +88,7 @@ srmcons_receive_chars(unsigned long data)
 
 /* called with callback_lock held */
 static int
-srmcons_do_write(struct tty_struct *tty, const char *buf, int count)
+srmcons_do_write(struct tty_port *port, const char *buf, int count)
 {
         static char str_cr[1] = "\r";
         long c, remaining = count;
@@ -114,10 +113,10 @@ srmcons_do_write(struct tty_struct *tty, const char *buf, int count)
                         cur += result.bits.c;
 
                         /*
-                         * Check for pending input iff a tty was provided
+                         * Check for pending input iff a tty port was provided
                          */
-                        if (tty)
-                                srmcons_do_receive_chars(tty);
+                        if (port)
+                                srmcons_do_receive_chars(port);
                 }
 
                 while (need_cr) {
@@ -136,7 +135,7 @@ srmcons_write(struct tty_struct *tty,
         unsigned long flags;
 
         spin_lock_irqsave(&srmcons_callback_lock, flags);
-        srmcons_do_write(tty, (const char *) buf, count);
+        srmcons_do_write(tty->port, (const char *) buf, count);
         spin_unlock_irqrestore(&srmcons_callback_lock, flags);
 
         return count;
diff --git a/drivers/s390/char/keyboard.h b/drivers/s390/char/keyboard.h
index acab28d4f06b..a31f339211d5 100644
--- a/drivers/s390/char/keyboard.h
+++ b/drivers/s390/char/keyboard.h
@@ -43,22 +43,14 @@ int kbd_ioctl(struct kbd_data *, unsigned int, unsigned long);
 static inline void
 kbd_put_queue(struct tty_port *port, int ch)
 {
-        struct tty_struct *tty = tty_port_tty_get(port);
-        if (!tty)
-                return;
         tty_insert_flip_char(port, ch, 0);
-        tty_schedule_flip(tty);
-        tty_kref_put(tty);
+        tty_schedule_flip(port);
 }
 
 static inline void
 kbd_puts_queue(struct tty_port *port, char *cp)
 {
-        struct tty_struct *tty = tty_port_tty_get(port);
-        if (!tty)
-                return;
         while (*cp)
                 tty_insert_flip_char(port, *cp++, 0);
-        tty_schedule_flip(tty);
-        tty_kref_put(tty);
+        tty_schedule_flip(port);
 }
diff --git a/drivers/staging/serqt_usb2/serqt_usb2.c b/drivers/staging/serqt_usb2/serqt_usb2.c
index df29a3de29f2..b1bb1a6abe81 100644
--- a/drivers/staging/serqt_usb2/serqt_usb2.c
+++ b/drivers/staging/serqt_usb2/serqt_usb2.c
@@ -356,7 +356,6 @@ static void qt_read_bulk_callback(struct urb *urb)
         struct usb_serial_port *port = urb->context;
         struct usb_serial *serial = get_usb_serial(port, __func__);
         struct quatech_port *qt_port = qt_get_port_private(port);
-        struct tty_struct *tty;
         int result;
 
         if (urb->status) {
@@ -367,27 +366,23 @@ static void qt_read_bulk_callback(struct urb *urb)
                 return;
         }
 
-        tty = tty_port_tty_get(&port->port);
-        if (!tty)
-                return;
-
         dev_dbg(&port->dev,
                 "%s - port->RxHolding = %d\n", __func__, qt_port->RxHolding);
 
         if (port_paranoia_check(port, __func__) != 0) {
                 qt_port->ReadBulkStopped = 1;
-                goto exit;
+                return;
         }
 
         if (!serial)
-                goto exit;
+                return;
 
         if (qt_port->closePending == 1) {
                 /* Were closing , stop reading */
                 dev_dbg(&port->dev,
                         "%s - (qt_port->closepending == 1\n", __func__);
                 qt_port->ReadBulkStopped = 1;
-                goto exit;
+                return;
         }
 
         /*
@@ -397,7 +392,7 @@ static void qt_read_bulk_callback(struct urb *urb)
          */
         if (qt_port->RxHolding == 1) {
                 qt_port->ReadBulkStopped = 1;
-                goto exit;
+                return;
         }
 
         if (urb->status) {
@@ -406,7 +401,7 @@ static void qt_read_bulk_callback(struct urb *urb)
                 dev_dbg(&port->dev,
                         "%s - nonzero read bulk status received: %d\n",
                         __func__, urb->status);
-                goto exit;
+                return;
         }
 
         if (urb->actual_length)
@@ -427,13 +422,11 @@ static void qt_read_bulk_callback(struct urb *urb)
         else {
                 if (urb->actual_length) {
                         tty_flip_buffer_push(&port->port);
-                        tty_schedule_flip(tty);
+                        tty_schedule_flip(&port->port);
                 }
         }
 
         schedule_work(&port->work);
-exit:
-        tty_kref_put(tty);
 }
 
 /*
diff --git a/drivers/tty/cyclades.c b/drivers/tty/cyclades.c
index d1fe9a1f8475..42a329b8af9f 100644
--- a/drivers/tty/cyclades.c
+++ b/drivers/tty/cyclades.c
@@ -441,7 +441,6 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
                 void __iomem *base_addr)
 {
         struct cyclades_port *info;
-        struct tty_struct *tty;
         struct tty_port *port;
         int len, index = cinfo->bus_index;
         u8 ivr, save_xir, channel, save_car, data, char_count;
@@ -458,18 +457,6 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
         cyy_writeb(info, CyCAR, save_xir);
         ivr = cyy_readb(info, CyRIVR) & CyIVRMask;
 
-        tty = tty_port_tty_get(port);
-        /* if there is nowhere to put the data, discard it */
-        if (tty == NULL) {
-                if (ivr == CyIVRRxEx) { /* exception */
-                        data = cyy_readb(info, CyRDSR);
-                } else {        /* normal character reception */
-                        char_count = cyy_readb(info, CyRDCR);
-                        while (char_count--)
-                                data = cyy_readb(info, CyRDSR);
-                }
-                goto end;
-        }
         /* there is an open port for this data */
         if (ivr == CyIVRRxEx) { /* exception */
                 data = cyy_readb(info, CyRDSR);
@@ -486,7 +473,6 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
 
                 if (data & info->ignore_status_mask) {
                         info->icount.rx++;
-                        tty_kref_put(tty);
                         return;
                 }
                 if (tty_buffer_request_room(port, 1)) {
@@ -496,8 +482,14 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
                                                 cyy_readb(info, CyRDSR),
                                                 TTY_BREAK);
                                         info->icount.rx++;
-                                        if (port->flags & ASYNC_SAK)
-                                                do_SAK(tty);
+                                        if (port->flags & ASYNC_SAK) {
+                                                struct tty_struct *tty =
+                                                        tty_port_tty_get(port);
+                                                if (tty) {
+                                                        do_SAK(tty);
+                                                        tty_kref_put(tty);
+                                                }
+                                        }
                                 } else if (data & CyFRAME) {
                                         tty_insert_flip_char(port,
                                                 cyy_readb(info, CyRDSR),
@@ -566,9 +558,8 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
                 }
                 info->idle_stats.recv_idle = jiffies;
         }
-        tty_schedule_flip(tty);
-        tty_kref_put(tty);
-end:
+        tty_schedule_flip(port);
+
         /* end of service */
         cyy_writeb(info, CyRIR, save_xir & 0x3f);
         cyy_writeb(info, CyCAR, save_car);
@@ -1012,7 +1003,7 @@ static void cyz_handle_rx(struct cyclades_port *info, struct tty_struct *tty)
                                                 jiffies + 1);
 #endif
                         info->idle_stats.recv_idle = jiffies;
-                        tty_schedule_flip(tty);
+                        tty_schedule_flip(&info->port);
                 }
                 /* Update rx_get */
                 cy_writel(&buf_ctrl->rx_get, new_rx_get);
@@ -1191,7 +1182,7 @@ static void cyz_handle_cmd(struct cyclades_card *cinfo)
                 if (delta_count)
                         wake_up_interruptible(&info->port.delta_msr_wait);
                 if (special_count)
-                        tty_schedule_flip(tty);
+                        tty_schedule_flip(&info->port);
                 tty_kref_put(tty);
         }
 }
diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c
index f42492db31c9..adeac255e526 100644
--- a/drivers/tty/moxa.c
+++ b/drivers/tty/moxa.c
@@ -1405,7 +1405,7 @@ static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
                 if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
                                 MoxaPortRxQueue(p) > 0) { /* RX */
                         MoxaPortReadData(p);
-                        tty_schedule_flip(tty);
+                        tty_schedule_flip(&p->port);
                 }
         } else {
                 clear_bit(EMPTYWAIT, &p->statusflags);
@@ -1430,7 +1430,7 @@ static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
 
         if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
                 tty_insert_flip_char(&p->port, 0, TTY_BREAK);
-                tty_schedule_flip(tty);
+                tty_schedule_flip(&p->port);
         }
 
         if (intr & IntrLine)
diff --git a/drivers/tty/serial/68328serial.c b/drivers/tty/serial/68328serial.c
index 3719273cf0be..641a5a4d73d9 100644
--- a/drivers/tty/serial/68328serial.c
+++ b/drivers/tty/serial/68328serial.c
@@ -262,8 +262,7 @@ static void rs_start(struct tty_struct *tty)
         local_irq_restore(flags);
 }
 
-static void receive_chars(struct m68k_serial *info, struct tty_struct *tty,
-                unsigned short rx)
+static void receive_chars(struct m68k_serial *info, unsigned short rx)
 {
         m68328_uart *uart = &uart_addr[info->line];
         unsigned char ch, flag;
@@ -293,9 +292,6 @@ static void receive_chars(struct m68k_serial *info, struct tty_struct *tty,
                         }
                 }
 
-                if(!tty)
-                        goto clear_and_exit;
-                
                 flag = TTY_NORMAL;
 
                 if (rx & URX_PARITY_ERROR)
@@ -310,10 +306,7 @@ static void receive_chars(struct m68k_serial *info, struct tty_struct *tty,
         } while((rx = uart->urx.w) & URX_DATA_READY);
 #endif
 
-        tty_schedule_flip(tty);
-
-clear_and_exit:
-        return;
+        tty_schedule_flip(&info->tport);
 }
 
 static void transmit_chars(struct m68k_serial *info, struct tty_struct *tty)
@@ -367,11 +360,11 @@ irqreturn_t rs_interrupt(int irq, void *dev_id)
         tx = uart->utx.w;
 
         if (rx & URX_DATA_READY)
-                receive_chars(info, tty, rx);
+                receive_chars(info, rx);
         if (tx & UTX_TX_AVAIL)
                 transmit_chars(info, tty);
 #else
-        receive_chars(info, tty, rx);
+        receive_chars(info, rx);
 #endif
         tty_kref_put(tty);
 
diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index c8448e6f52e5..c01b58f3729c 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -323,7 +323,6 @@ static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
 {
         struct uart_port *port = dev_id;
         struct tty_port *port = &port->state->port;
-        struct tty_struct *tty = tty_port_tty_get(tport);
         u32 status;
 
         spin_lock(&port->lock);
@@ -348,9 +347,7 @@ static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
                        LPC32XX_HSUART_IIR(port->membase));
                 port->icount.overrun++;
                 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
-                if (tty) {
-                        tty_schedule_flip(tty);
-                }
+                tty_schedule_flip(tport);
         }
 
         /* Data received? */
@@ -366,7 +363,6 @@ static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
         }
 
         spin_unlock(&port->lock);
-        tty_kref_put(tty);
 
         return IRQ_HANDLED;
 }
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index b6efacadf23b..d6969f6e4c43 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -349,7 +349,7 @@ EXPORT_SYMBOL(tty_insert_flip_string_flags);
 
 /**
  *      tty_schedule_flip       -       push characters to ldisc
- *      @tty: tty to push from
+ *      @port: tty port to push from
  *
  *      Takes any pending buffers and transfers their ownership to the
  *      ldisc side of the queue. It then schedules those characters for
@@ -360,11 +360,11 @@ EXPORT_SYMBOL(tty_insert_flip_string_flags);
  *      Locking: Takes port->buf.lock
  */
 
-void tty_schedule_flip(struct tty_struct *tty)
+void tty_schedule_flip(struct tty_port *port)
 {
-        struct tty_bufhead *buf = &tty->port->buf;
+        struct tty_bufhead *buf = &port->buf;
         unsigned long flags;
-        WARN_ON(tty->port->low_latency);
+        WARN_ON(port->low_latency);
 
         spin_lock_irqsave(&buf->lock, flags);
         if (buf->tail != NULL)
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index 5aace4d47cb6..a9af1b9ae160 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -307,26 +307,17 @@ int kbd_rate(struct kbd_repeat *rep)
  */
 static void put_queue(struct vc_data *vc, int ch)
 {
-        struct tty_struct *tty = vc->port.tty;
-
         tty_insert_flip_char(&vc->port, ch, 0);
-        if (tty) {
-                tty_schedule_flip(tty);
-        }
+        tty_schedule_flip(&vc->port);
 }
 
 static void puts_queue(struct vc_data *vc, char *cp)
 {
-        struct tty_struct *tty = vc->port.tty;
-
-        if (!tty)
-                return;
-
         while (*cp) {
                 tty_insert_flip_char(&vc->port, *cp, 0);
                 cp++;
         }
-        tty_schedule_flip(tty);
+        tty_schedule_flip(&vc->port);
 }
 
 static void applkey(struct vc_data *vc, int key, char mode)
@@ -582,12 +573,8 @@ static void fn_inc_console(struct vc_data *vc)
 
 static void fn_send_intr(struct vc_data *vc)
 {
-        struct tty_struct *tty = vc->port.tty;
-
-        if (!tty)
-                return;
         tty_insert_flip_char(&vc->port, 0, TTY_BREAK);
-        tty_schedule_flip(tty);
+        tty_schedule_flip(&vc->port);
 }
 
 static void fn_scroll_forw(struct vc_data *vc)
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 811f2505e9ee..1a2728034599 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1333,13 +1333,13 @@ static void csi_m(struct vc_data *vc)
         update_attr(vc);
 }
 
-static void respond_string(const char *p, struct tty_struct *tty)
+static void respond_string(const char *p, struct tty_port *port)
 {
         while (*p) {
-                tty_insert_flip_char(tty->port, *p, 0);
+                tty_insert_flip_char(port, *p, 0);
                 p++;
         }
-        tty_schedule_flip(tty);
+        tty_schedule_flip(port);
 }
 
 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
@@ -1347,17 +1347,17 @@ static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
         char buf[40];
 
         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
-        respond_string(buf, tty);
+        respond_string(buf, tty->port);
 }
 
 static inline void status_report(struct tty_struct *tty)
 {
-        respond_string("\033[0n", tty); /* Terminal ok */
+        respond_string("\033[0n", tty->port);   /* Terminal ok */
 }
 
-static inline void respond_ID(struct tty_struct * tty)
+static inline void respond_ID(struct tty_struct *tty)
 {
-        respond_string(VT102ID, tty);
+        respond_string(VT102ID, tty->port);
 }
 
 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
@@ -1366,7 +1366,7 @@ void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
 
         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
                 (char)('!' + mry));
-        respond_string(buf, tty);
+        respond_string(buf, tty->port);
 }
 
 /* invoked via ioctl(TIOCLINUX) and through set_selection */
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h
index c5572807633a..e0f252633b47 100644
--- a/include/linux/tty_flip.h
+++ b/include/linux/tty_flip.h
@@ -11,7 +11,7 @@ extern int tty_prepare_flip_string(struct tty_port *port,
 extern int tty_prepare_flip_string_flags(struct tty_port *port,
                 unsigned char **chars, char **flags, size_t size);
 extern void tty_flip_buffer_push(struct tty_port *port);
-void tty_schedule_flip(struct tty_struct *tty);
+void tty_schedule_flip(struct tty_port *port);
 
 static inline int tty_insert_flip_char(struct tty_port *port,
                                         unsigned char ch, char flag)