• Alan Cox's avatar
    tty: The big operations rework · f34d7a5b
    Alan Cox authored
    - Operations are now a shared const function block as with most other Linux
    - 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: default avatarAlan Cox <alan@redhat.com>
    Acked-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    Cc: Jason Wessel <jason.wessel@windriver.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>