serial: use tty_port

Switch the serial_core based drivers to use the new tty_port structure.
We can't quite use all of it yet because of the dynamically allocated
extras in the serial_core layer.

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

5 files changed, 60 insertions, 58 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index ac4f20cbfe41..ce948b66bbd4 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1287,7 +1287,7 @@ static void serial8250_enable_ms(struct uart_port *port)
 static void
 receive_chars(struct uart_8250_port *up, unsigned int *status)
 {
-        struct tty_struct *tty = up->port.info->tty;
+        struct tty_struct *tty = up->port.info->port.tty;
         unsigned char ch, lsr = *status;
         int max_count = 256;
         char flag;
diff --git a/drivers/serial/jsm/jsm_neo.c b/drivers/serial/jsm/jsm_neo.c
index b2d6f5b1a7c2..b7584ca55ade 100644
--- a/drivers/serial/jsm/jsm_neo.c
+++ b/drivers/serial/jsm/jsm_neo.c
@@ -998,7 +998,7 @@ static void neo_param(struct jsm_channel *ch)
                         {     50, B50     },
                 };
 
-                cflag = C_BAUD(ch->uart_port.info->tty);
+                cflag = C_BAUD(ch->uart_port.info->port.tty);
                 baud = 9600;
                 for (i = 0; i < ARRAY_SIZE(baud_rates); i++) {
                         if (baud_rates[i].cflag == cflag) {
diff --git a/drivers/serial/jsm/jsm_tty.c b/drivers/serial/jsm/jsm_tty.c
index 94ec66372508..a697914ae3d0 100644
--- a/drivers/serial/jsm/jsm_tty.c
+++ b/drivers/serial/jsm/jsm_tty.c
@@ -145,7 +145,7 @@ static void jsm_tty_send_xchar(struct uart_port *port, char ch)
         struct ktermios *termios;
 
         spin_lock_irqsave(&port->lock, lock_flags);
-        termios = port->info->tty->termios;
+        termios = port->info->port.tty->termios;
         if (ch == termios->c_cc[VSTART])
                 channel->ch_bd->bd_ops->send_start_character(channel);
 
@@ -239,7 +239,7 @@ static int jsm_tty_open(struct uart_port *port)
         channel->ch_cached_lsr = 0;
         channel->ch_stops_sent = 0;
 
-        termios = port->info->tty->termios;
+        termios = port->info->port.tty->termios;
         channel->ch_c_cflag     = termios->c_cflag;
         channel->ch_c_iflag     = termios->c_iflag;
         channel->ch_c_oflag     = termios->c_oflag;
@@ -272,7 +272,7 @@ static void jsm_tty_close(struct uart_port *port)
         jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n");
 
         bd = channel->ch_bd;
-        ts = channel->uart_port.info->tty->termios;
+        ts = channel->uart_port.info->port.tty->termios;
 
         channel->ch_flags &= ~(CH_STOPI);
 
@@ -515,7 +515,7 @@ void jsm_input(struct jsm_channel *ch)
         if (!ch)
                 return;
 
-        tp = ch->uart_port.info->tty;
+        tp = ch->uart_port.info->port.tty;
 
         bd = ch->ch_bd;
         if(!bd)
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 9884bc9eecb1..0bce1fe2c62a 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -50,7 +50,7 @@ static struct lock_class_key port_lock_key;
 
 #define HIGH_BITS_OFFSET        ((sizeof(long)-sizeof(int))*8)
 
-#define uart_users(state)       ((state)->count + ((state)->info ? (state)->info->blocked_open : 0))
+#define uart_users(state)       ((state)->count + ((state)->info ? (state)->info->port.blocked_open : 0))
 
 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 #define uart_console(port)      ((port)->cons && (port)->cons->index == (port)->line)
@@ -113,7 +113,7 @@ static void uart_start(struct tty_struct *tty)
 static void uart_tasklet_action(unsigned long data)
 {
         struct uart_state *state = (struct uart_state *)data;
-        tty_wakeup(state->info->tty);
+        tty_wakeup(state->info->port.tty);
 }
 
 static inline void
@@ -135,7 +135,7 @@ uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
 
 /*
  * Startup the port.  This will be called once per open.  All calls
- * will be serialised by the per-port semaphore.
+ * will be serialised by the per-port mutex.
  */
 static int uart_startup(struct uart_state *state, int init_hw)
 {
@@ -152,7 +152,7 @@ static int uart_startup(struct uart_state *state, int init_hw)
          * once we have successfully opened the port.  Also set
          * up the tty->alt_speed kludge
          */
-        set_bit(TTY_IO_ERROR, &info->tty->flags);
+        set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 
         if (port->type == PORT_UNKNOWN)
                 return 0;
@@ -162,6 +162,7 @@ static int uart_startup(struct uart_state *state, int init_hw)
          * buffer.
          */
         if (!info->xmit.buf) {
+                /* This is protected by the per port mutex */
                 page = get_zeroed_page(GFP_KERNEL);
                 if (!page)
                         return -ENOMEM;
@@ -182,20 +183,20 @@ static int uart_startup(struct uart_state *state, int init_hw)
                          * Setup the RTS and DTR signals once the
                          * port is open and ready to respond.
                          */
-                        if (info->tty->termios->c_cflag & CBAUD)
+                        if (info->port.tty->termios->c_cflag & CBAUD)
                                 uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
                 }
 
                 if (info->flags & UIF_CTS_FLOW) {
                         spin_lock_irq(&port->lock);
                         if (!(port->ops->get_mctrl(port) & TIOCM_CTS))
-                                info->tty->hw_stopped = 1;
+                                info->port.tty->hw_stopped = 1;
                         spin_unlock_irq(&port->lock);
                 }
 
                 info->flags |= UIF_INITIALIZED;
 
-                clear_bit(TTY_IO_ERROR, &info->tty->flags);
+                clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
         }
 
         if (retval && capable(CAP_SYS_ADMIN))
@@ -217,8 +218,8 @@ static void uart_shutdown(struct uart_state *state)
         /*
          * Set the TTY IO error marker
          */
-        if (info->tty)
-                set_bit(TTY_IO_ERROR, &info->tty->flags);
+        if (info->port.tty)
+                set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 
         if (info->flags & UIF_INITIALIZED) {
                 info->flags &= ~UIF_INITIALIZED;
@@ -226,7 +227,7 @@ static void uart_shutdown(struct uart_state *state)
                 /*
                  * Turn off DTR and RTS early.
                  */
-                if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
+                if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
                         uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
 
                 /*
@@ -426,7 +427,7 @@ EXPORT_SYMBOL(uart_get_divisor);
 static void
 uart_change_speed(struct uart_state *state, struct ktermios *old_termios)
 {
-        struct tty_struct *tty = state->info->tty;
+        struct tty_struct *tty = state->info->port.tty;
         struct uart_port *port = state->port;
         struct ktermios *termios;
 
@@ -836,8 +837,8 @@ static int uart_set_info(struct uart_state *state,
         state->closing_wait    = closing_wait;
         if (new_serial.xmit_fifo_size)
                 port->fifosize = new_serial.xmit_fifo_size;
-        if (state->info->tty)
-                state->info->tty->low_latency =
+        if (state->info->port.tty)
+                state->info->port.tty->low_latency =
                         (port->flags & UPF_LOW_LATENCY) ? 1 : 0;
 
  check_and_exit:
@@ -857,7 +858,7 @@ static int uart_set_info(struct uart_state *state,
                                 printk(KERN_NOTICE
                                        "%s sets custom speed on %s. This "
                                        "is deprecated.\n", current->comm,
-                                       tty_name(state->info->tty, buf));
+                                       tty_name(state->info->port.tty, buf));
                         }
                         uart_change_speed(state, NULL);
                 }
@@ -889,7 +890,7 @@ static int uart_get_lsr_info(struct uart_state *state,
          */
         if (port->x_char ||
             ((uart_circ_chars_pending(&state->info->xmit) > 0) &&
-             !state->info->tty->stopped && !state->info->tty->hw_stopped))
+             !state->info->port.tty->stopped && !state->info->port.tty->hw_stopped))
                 result &= ~TIOCSER_TEMT;
 
         return put_user(result, value);
@@ -1239,7 +1240,7 @@ static void uart_set_termios(struct tty_struct *tty,
          */
         if (!(old_termios->c_cflag & CLOCAL) &&
             (tty->termios->c_cflag & CLOCAL))
-                wake_up_interruptible(&state->info->open_wait);
+                wake_up_interruptible(&state->info->port.open_wait);
 #endif
 }
 
@@ -1320,9 +1321,9 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
         tty_ldisc_flush(tty);
 
         tty->closing = 0;
-        state->info->tty = NULL;
+        state->info->port.tty = NULL;
 
-        if (state->info->blocked_open) {
+        if (state->info->port.blocked_open) {
                 if (state->close_delay)
                         msleep_interruptible(state->close_delay);
         } else if (!uart_console(port)) {
@@ -1333,7 +1334,7 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
          * Wake up anyone trying to open this port.
          */
         state->info->flags &= ~UIF_NORMAL_ACTIVE;
-        wake_up_interruptible(&state->info->open_wait);
+        wake_up_interruptible(&state->info->port.open_wait);
 
  done:
         mutex_unlock(&state->mutex);
@@ -1417,8 +1418,8 @@ static void uart_hangup(struct tty_struct *tty)
                 uart_shutdown(state);
                 state->count = 0;
                 state->info->flags &= ~UIF_NORMAL_ACTIVE;
-                state->info->tty = NULL;
-                wake_up_interruptible(&state->info->open_wait);
+                state->info->port.tty = NULL;
+                wake_up_interruptible(&state->info->port.open_wait);
                 wake_up_interruptible(&state->info->delta_msr_wait);
         }
         mutex_unlock(&state->mutex);
@@ -1432,7 +1433,7 @@ static void uart_hangup(struct tty_struct *tty)
  */
 static void uart_update_termios(struct uart_state *state)
 {
-        struct tty_struct *tty = state->info->tty;
+        struct tty_struct *tty = state->info->port.tty;
         struct uart_port *port = state->port;
 
         if (uart_console(port) && port->cons->cflag) {
@@ -1471,17 +1472,17 @@ uart_block_til_ready(struct file *filp, struct uart_state *state)
         struct uart_port *port = state->port;
         unsigned int mctrl;
 
-        info->blocked_open++;
+        info->port.blocked_open++;
         state->count--;
 
-        add_wait_queue(&info->open_wait, &wait);
+        add_wait_queue(&info->port.open_wait, &wait);
         while (1) {
                 set_current_state(TASK_INTERRUPTIBLE);
 
                 /*
                  * If we have been hung up, tell userspace/restart open.
                  */
-                if (tty_hung_up_p(filp) || info->tty == NULL)
+                if (tty_hung_up_p(filp) || info->port.tty == NULL)
                         break;
 
                 /*
@@ -1500,8 +1501,8 @@ uart_block_til_ready(struct file *filp, struct uart_state *state)
                  * have set TTY_IO_ERROR for a non-existant port.
                  */
                 if ((filp->f_flags & O_NONBLOCK) ||
-                    (info->tty->termios->c_cflag & CLOCAL) ||
-                    (info->tty->flags & (1 << TTY_IO_ERROR)))
+                    (info->port.tty->termios->c_cflag & CLOCAL) ||
+                    (info->port.tty->flags & (1 << TTY_IO_ERROR)))
                         break;
 
                 /*
@@ -1509,7 +1510,7 @@ uart_block_til_ready(struct file *filp, struct uart_state *state)
                  * not set RTS here - we want to make sure we catch
                  * the data from the modem.
                  */
-                if (info->tty->termios->c_cflag & CBAUD)
+                if (info->port.tty->termios->c_cflag & CBAUD)
                         uart_set_mctrl(port, TIOCM_DTR);
 
                 /*
@@ -1531,15 +1532,15 @@ uart_block_til_ready(struct file *filp, struct uart_state *state)
                         break;
         }
         set_current_state(TASK_RUNNING);
-        remove_wait_queue(&info->open_wait, &wait);
+        remove_wait_queue(&info->port.open_wait, &wait);
 
         state->count++;
-        info->blocked_open--;
+        info->port.blocked_open--;
 
         if (signal_pending(current))
                 return -ERESTARTSYS;
 
-        if (!info->tty || tty_hung_up_p(filp))
+        if (!info->port.tty || tty_hung_up_p(filp))
                 return -EAGAIN;
 
         return 0;
@@ -1562,10 +1563,13 @@ static struct uart_state *uart_get(struct uart_driver *drv, int line)
                 goto err_unlock;
         }
 
+        /* BKL: RACE HERE - LEAK */
+        /* We should move this into the uart_state structure and kill off
+           this whole complexity */
         if (!state->info) {
                 state->info = kzalloc(sizeof(struct uart_info), GFP_KERNEL);
                 if (state->info) {
-                        init_waitqueue_head(&state->info->open_wait);
+                        init_waitqueue_head(&state->info->port.open_wait);
                         init_waitqueue_head(&state->info->delta_msr_wait);
 
                         /*
@@ -1622,7 +1626,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
          * be re-entered while allocating the info structure, or while we
          * request any IRQs that the driver may need.  This also has the nice
          * side-effect that it delays the action of uart_hangup, so we can
-         * guarantee that info->tty will always contain something reasonable.
+         * guarantee that info->port.tty will always contain something reasonable.
          */
         state = uart_get(drv, line);
         if (IS_ERR(state)) {
@@ -1638,7 +1642,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
         tty->driver_data = state;
         tty->low_latency = (state->port->flags & UPF_LOW_LATENCY) ? 1 : 0;
         tty->alt_speed = 0;
-        state->info->tty = tty;
+        state->info->port.tty = tty;
 
         /*
          * If the port is in the middle of closing, bail out now.
@@ -2101,8 +2105,8 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *port)
                 /*
                  * If that's unset, use the tty termios setting.
                  */
-                if (state->info && state->info->tty && termios.c_cflag == 0)
-                        termios = *state->info->tty->termios;
+                if (state->info && state->info->port.tty && termios.c_cflag == 0)
+                        termios = *state->info->port.tty->termios;
 
                 uart_change_pm(state, 0);
                 port->ops->set_termios(port, &termios, NULL);
@@ -2521,8 +2525,8 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *port)
         tty_unregister_device(drv->tty_driver, port->line);
 
         info = state->info;
-        if (info && info->tty)
-                tty_vhangup(info->tty);
+        if (info && info->port.tty)
+                tty_vhangup(info->port.tty);
 
         /*
          * All users of this port should now be disconnected from
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 1d2faa6592ae..f3a1c0e45021 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -344,13 +344,15 @@ typedef unsigned int __bitwise__ uif_t;
  * stuff here.
  */
 struct uart_info {
-        struct tty_struct       *tty;
+        struct tty_port         port;
         struct circ_buf         xmit;
         uif_t                   flags;
 
 /*
  * Definitions for info->flags.  These are _private_ to serial_core, and
  * are specific to this structure.  They may be queried by low level drivers.
+ *
+ * FIXME: use the ASY_ definitions
  */
 #define UIF_CHECK_CD            ((__force uif_t) (1 << 25))
 #define UIF_CTS_FLOW            ((__force uif_t) (1 << 26))
@@ -358,11 +360,7 @@ struct uart_info {
 #define UIF_INITIALIZED         ((__force uif_t) (1 << 31))
 #define UIF_SUSPENDED           ((__force uif_t) (1 << 30))
 
-        int                     blocked_open;
-
         struct tasklet_struct   tlet;
-
-        wait_queue_head_t       open_wait;
         wait_queue_head_t       delta_msr_wait;
 };
 
@@ -439,8 +437,8 @@ int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 #define uart_circ_chars_free(circ)      \
         (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
 
-#define uart_tx_stopped(port)           \
-        ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
+#define uart_tx_stopped(portp)          \
+        ((portp)->info->port.tty->stopped || (portp)->info->port.tty->hw_stopped)
 
 /*
  * The following are helper functions for the low level drivers.
@@ -451,7 +449,7 @@ uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 #ifdef SUPPORT_SYSRQ
         if (port->sysrq) {
                 if (ch && time_before(jiffies, port->sysrq)) {
-                        handle_sysrq(ch, port->info ? port->info->tty : NULL);
+                        handle_sysrq(ch, port->info ? port->info->port.tty : NULL);
                         port->sysrq = 0;
                         return 1;
                 }
@@ -480,7 +478,7 @@ static inline int uart_handle_break(struct uart_port *port)
         }
 #endif
         if (port->flags & UPF_SAK)
-                do_SAK(info->tty);
+                do_SAK(info->port.tty);
         return 0;
 }
 
@@ -503,9 +501,9 @@ uart_handle_dcd_change(struct uart_port *port, unsigned int status)
 
         if (info->flags & UIF_CHECK_CD) {
                 if (status)
-                        wake_up_interruptible(&info->open_wait);
-                else if (info->tty)
-                        tty_hangup(info->tty);
+                        wake_up_interruptible(&info->port.open_wait);
+                else if (info->port.tty)
+                        tty_hangup(info->port.tty);
         }
 }
 
@@ -518,7 +516,7 @@ static inline void
 uart_handle_cts_change(struct uart_port *port, unsigned int status)
 {
         struct uart_info *info = port->info;
-        struct tty_struct *tty = info->tty;
+        struct tty_struct *tty = info->port.tty;
 
         port->icount.cts++;
 
@@ -544,7 +542,7 @@ static inline void
 uart_insert_char(struct uart_port *port, unsigned int status,
                  unsigned int overrun, unsigned int ch, unsigned int flag)
 {
-        struct tty_struct *tty = port->info->tty;
+        struct tty_struct *tty = port->info->port.tty;
 
         if ((status & port->ignore_status_mask & ~overrun) == 0)
                 tty_insert_flip_char(tty, ch, flag);