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>

1 files changed, 42 insertions, 38 deletions

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 9884bc9eecb..0bce1fe2c62 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