tty: The big operations rework

- Operations are now a shared const function block as with most other Linux
  objects

- Introduce wrappers for some optional functions to get consistent behaviour

- Wrap put_char which used to be patched by the tty layer

- Document which functions are needed/optional

- Make put_char report success/fail

- Cache the driver->ops pointer in the tty as tty->ops

- Remove various surplus lock calls we no longer need

- Remove proc_write method as noted by Alexey Dobriyan

- Introduce some missing sanity checks where certain driver/ldisc
  combinations would oops as they didn't check needed methods were present

[akpm@linux-foundation.org: fix fs/compat_ioctl.c build]
[akpm@linux-foundation.org: fix isicom]
[akpm@linux-foundation.org: fix arch/ia64/hp/sim/simserial.c build]
[akpm@linux-foundation.org: fix kgdb]
Signed-off-by: Alan Cox <alan@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 60b934adea65..d1c50b3302e5 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -1230,7 +1230,7 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
 
         if (rep &&
             (!vc_kbd_mode(kbd, VC_REPEAT) ||
-             (tty && !L_ECHO(tty) && tty->driver->chars_in_buffer(tty)))) {
+             (tty && !L_ECHO(tty) && tty_chars_in_buffer(tty)))) {
                 /*
                  * Don't repeat a key if the input buffers are not empty and the
                  * characters get aren't echoed locally. This makes key repeat