1 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index e1065ac0d922..16d27944c321 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -168,6 +168,18 @@
  *
  *      Optional: If not provided then the write method is called under
  *      the atomic write lock to keep it serialized with the ldisc.
+ *
+ * int (*resize)(struct tty_struct *tty, struct tty_struct *real_tty,
+ *                              unsigned int rows, unsigned int cols);
+ *
+ *      Called when a termios request is issued which changes the
+ *      requested terminal geometry.
+ *
+ *      Optional: the default action is to update the termios structure
+ *      without error. This is usually the correct behaviour. Drivers should
+ *      not force errors here if they are not resizable objects (eg a serial
+ *      line). See tty_do_resize() if you need to wrap the standard method
+ *      in your own logic - the usual case.
  */
 
 #include <linux/fs.h>
@@ -206,6 +218,8 @@ struct tty_operations {
         int (*tiocmget)(struct tty_struct *tty, struct file *file);
         int (*tiocmset)(struct tty_struct *tty, struct file *file,
                         unsigned int set, unsigned int clear);
+        int (*resize)(struct tty_struct *tty, struct tty_struct *real_tty,
+                                struct winsize *ws);
 #ifdef CONFIG_CONSOLE_POLL
         int (*poll_init)(struct tty_driver *driver, int line, char *options);
         int (*poll_get_char)(struct tty_driver *driver, int line);