Merge /spare/repo/linux-2.6/

1 files changed, 40 insertions, 2 deletions

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 36b1ae083fb..54699c3a00a 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -182,6 +182,13 @@ static int uart_startup(struct uart_state *state, int init_hw)
                                 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;
+                        spin_unlock_irq(&port->lock);
+                }
+
                 info->flags |= UIF_INITIALIZED;
 
                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
@@ -828,7 +835,10 @@ static int uart_tiocmget(struct tty_struct *tty, struct file *file)
         if ((!file || !tty_hung_up_p(file)) &&
             !(tty->flags & (1 << TTY_IO_ERROR))) {
                 result = port->mctrl;
+
+                spin_lock_irq(&port->lock);
                 result |= port->ops->get_mctrl(port);
+                spin_unlock_irq(&port->lock);
         }
         up(&state->sem);
 
@@ -1131,6 +1141,16 @@ static void uart_set_termios(struct tty_struct *tty, struct termios *old_termios
                 spin_unlock_irqrestore(&state->port->lock, flags);
         }
 
+        /* Handle turning on CRTSCTS */
+        if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
+                spin_lock_irqsave(&state->port->lock, flags);
+                if (!(state->port->ops->get_mctrl(state->port) & TIOCM_CTS)) {
+                        tty->hw_stopped = 1;
+                        state->port->ops->stop_tx(state->port, 0);
+                }
+                spin_unlock_irqrestore(&state->port->lock, flags);
+        }
+
 #if 0
         /*
          * No need to wake up processes in open wait, since they
@@ -1369,6 +1389,7 @@ uart_block_til_ready(struct file *filp, struct uart_state *state)
         DECLARE_WAITQUEUE(wait, current);
         struct uart_info *info = state->info;
         struct uart_port *port = state->port;
+        unsigned int mctrl;
 
         info->blocked_open++;
         state->count--;
@@ -1416,7 +1437,10 @@ uart_block_til_ready(struct file *filp, struct uart_state *state)
                  * and wait for the carrier to indicate that the
                  * modem is ready for us.
                  */
-                if (port->ops->get_mctrl(port) & TIOCM_CAR)
+                spin_lock_irq(&port->lock);
+                mctrl = port->ops->get_mctrl(port);
+                spin_unlock_irq(&port->lock);
+                if (mctrl & TIOCM_CAR)
                         break;
 
                 up(&state->sem);
@@ -1618,7 +1642,9 @@ static int uart_line_info(char *buf, struct uart_driver *drv, int i)
 
         if(capable(CAP_SYS_ADMIN))
         {
+                spin_lock_irq(&port->lock);
                 status = port->ops->get_mctrl(port);
+                spin_unlock_irq(&port->lock);
 
                 ret += sprintf(buf + ret, " tx:%d rx:%d",
                                 port->icount.tx, port->icount.rx);
@@ -1782,6 +1808,12 @@ uart_set_options(struct uart_port *port, struct console *co,
         struct termios termios;
         int i;
 
+        /*
+         * Ensure that the serial console lock is initialised
+         * early.
+         */
+        spin_lock_init(&port->lock);
+
         memset(&termios, 0, sizeof(struct termios));
 
         termios.c_cflag = CREAD | HUPCL | CLOCAL;
@@ -2170,10 +2202,16 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *port)
 
         state->port = port;
 
-        spin_lock_init(&port->lock);
         port->cons = drv->cons;
         port->info = state->info;
 
+        /*
+         * If this port is a console, then the spinlock is already
+         * initialised.
+         */
+        if (!uart_console(port))
+                spin_lock_init(&port->lock);
+
         uart_configure_port(drv, state, port);
 
         /*