tty_driver: Update required method documentation

Some of the requirement rules are now more relaxed. Also correct a
contradiction in the previous update

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

diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 59f1c0b..d2a0035 100644 (file)
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -27,8 +27,7 @@
  *     This routine is called by the kernel to write a series of
  *     characters to the tty device.  The characters may come from
  *     user space or kernel space.  This routine will return the
- *     number of characters actually accepted for writing.  This
- *     routine is mandatory.
+ *     number of characters actually accepted for writing.
  *
  *     Optional: Required for writable devices.
  *
@@ -134,7 +133,7 @@
  *     This routine notifies the tty driver that it should hangup the
  *     tty device.
  *
- *     Required:
+ *     Optional:
  *
  * void (*break_ctl)(struct tty_stuct *tty, int state);
  *