[PATCH 1/2] tty_driver: Update required method documentation

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

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>
---

 include/linux/tty_driver.h |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)


diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 59f1c0b..d2a0035 100644
--- 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);
  *