Merge master.kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb

[linux-2.6-omap-h63xx.git] / drivers / serial / serial_core.c

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 0717abfdae06f1eed3d132cdbd7e7a3cced60858..fcd7744c4253fa390b28806baf3b093d97d82339 100644 (file)
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -71,6 +71,11 @@ static void uart_change_pm(struct uart_state *state, int pm_state);
 void uart_write_wakeup(struct uart_port *port)
 {
        struct uart_info *info = port->info;
+       /*
+        * This means you called this function _after_ the port was
+        * closed.  No cookie for you.
+        */
+       BUG_ON(!info);
        tasklet_schedule(&info->tlet);
 }
 
@@ -471,14 +476,26 @@ static void uart_flush_chars(struct tty_struct *tty)
 }
 
 static int
-uart_write(struct tty_struct *tty, const unsigned char * buf, int count)
+uart_write(struct tty_struct *tty, const unsigned char *buf, int count)
 {
        struct uart_state *state = tty->driver_data;
-       struct uart_port *port = state->port;
-       struct circ_buf *circ = &state->info->xmit;
+       struct uart_port *port;
+       struct circ_buf *circ;
        unsigned long flags;
        int c, ret = 0;
 
+       /*
+        * This means you called this function _after_ the port was
+        * closed.  No cookie for you.
+        */
+       if (!state || !state->info) {
+               WARN_ON(1);
+               return -EL3HLT;
+       }
+
+       port = state->port;
+       circ = &state->info->xmit;
+
        if (!circ->buf)
                return 0;
 
@@ -521,6 +538,15 @@ static void uart_flush_buffer(struct tty_struct *tty)
        struct uart_port *port = state->port;
        unsigned long flags;
 
+       /*
+        * This means you called this function _after_ the port was
+        * closed.  No cookie for you.
+        */
+       if (!state || !state->info) {
+               WARN_ON(1);
+               return;
+       }
+
        DPRINTK("uart_flush_buffer(%d) called\n", tty->index);
 
        spin_lock_irqsave(&port->lock, flags);
@@ -1728,6 +1754,27 @@ static int uart_read_proc(char *page, char **start, off_t off,
 #endif
 
 #ifdef CONFIG_SERIAL_CORE_CONSOLE
+/*
+ *     uart_console_write - write a console message to a serial port
+ *     @port: the port to write the message
+ *     @s: array of characters
+ *     @count: number of characters in string to write
+ *     @write: function to write character to port
+ */
+void uart_console_write(struct uart_port *port, const char *s,
+                       unsigned int count,
+                       void (*putchar)(struct uart_port *, int))
+{
+       unsigned int i;
+
+       for (i = 0; i < count; i++, s++) {
+               if (*s == '\n')
+                       putchar(port, '\r');
+               putchar(port, *s);
+       }
+}
+EXPORT_SYMBOL_GPL(uart_console_write);
+
 /*
  *     Check whether an invalid uart number has been specified, and
  *     if so, search for the first available port that does have
@@ -2237,7 +2284,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *port)
         * If this port is a console, then the spinlock is already
         * initialised.
         */
-       if (!uart_console(port))
+       if (!(uart_console(port) && (port->cons->flags & CON_ENABLED)))
                spin_lock_init(&port->lock);
 
        uart_configure_port(drv, state, port);