tty: Move tty_write_message out of kernel/printk

This is pure tty code so put it in the tty layer where it can be with the
locking relevant material it uses

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

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 4c0e4ed31a48..913b50258f90 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1081,6 +1081,31 @@ out:
         return ret;
 }
 
+/**
+ * tty_write_message - write a message to a certain tty, not just the console.
+ * @tty: the destination tty_struct
+ * @msg: the message to write
+ *
+ * This is used for messages that need to be redirected to a specific tty.
+ * We don't put it into the syslog queue right now maybe in the future if
+ * really needed.
+ *
+ * We must still hold the BKL and test the CLOSING flag for the moment.
+ */
+
+void tty_write_message(struct tty_struct *tty, char *msg)
+{
+        lock_kernel();
+        if (tty) {
+                mutex_lock(&tty->atomic_write_lock);
+                if (tty->ops->write && !test_bit(TTY_CLOSING, &tty->flags))
+                        tty->ops->write(tty, msg, strlen(msg));
+                tty_write_unlock(tty);
+        }
+        unlock_kernel();
+        return;
+}
+
 
 /**
  *      tty_write               -       write method for tty device file