tty: Move and rename send_prio_char() as tty_send_xchar()

[linux-2.6-block.git] / drivers / tty / tty_io.c

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c249ff1d51ceab8de81f0160a202317fea836167..2f6f9b5e4891d1fb92cec7687d9066c22993566c 100644 (file)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1023,14 +1023,14 @@ static ssize_t tty_read(struct file *file, char __user *buf, size_t count,
        return i;
 }
 
-void tty_write_unlock(struct tty_struct *tty)
+static void tty_write_unlock(struct tty_struct *tty)
        __releases(&tty->atomic_write_lock)
 {
        mutex_unlock(&tty->atomic_write_lock);
        wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
 }
 
-int tty_write_lock(struct tty_struct *tty, int ndelay)
+static int tty_write_lock(struct tty_struct *tty, int ndelay)
        __acquires(&tty->atomic_write_lock)
 {
        if (!mutex_trylock(&tty->atomic_write_lock)) {
@@ -1217,6 +1217,35 @@ ssize_t redirected_tty_write(struct file *file, const char __user *buf,
        return tty_write(file, buf, count, ppos);
 }
 
+/**
+ *     tty_send_xchar  -       send priority character
+ *
+ *     Send a high priority character to the tty even if stopped
+ *
+ *     Locking: none for xchar method, write ordering for write method.
+ */
+
+int tty_send_xchar(struct tty_struct *tty, char ch)
+{
+       int     was_stopped = tty->stopped;
+
+       if (tty->ops->send_xchar) {
+               tty->ops->send_xchar(tty, ch);
+               return 0;
+       }
+
+       if (tty_write_lock(tty, 0) < 0)
+               return -ERESTARTSYS;
+
+       if (was_stopped)
+               start_tty(tty);
+       tty->ops->write(tty, &ch, 1);
+       if (was_stopped)
+               stop_tty(tty);
+       tty_write_unlock(tty);
+       return 0;
+}
+
 static char ptychar[] = "pqrstuvwxyzabcde";
 
 /**