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| author | Paul Fulghum <paulkf@microgate.com> | 2006-06-28 15:26:47 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-29 01:59:05 +0400 |
| commit | 817d6d3bceaf34c99f5343820f9b9e6021f0655c (patch) | |
| tree | 651104833124262db46c2a372b7adb55289cd8dd /include | |
| parent | e0ac4761fa52acda90f9f53819c81474b511e3af (diff) | |
| download | linux-817d6d3bceaf34c99f5343820f9b9e6021f0655c.tar.xz | |
[PATCH] remove TTY_DONT_FLIP
Remove TTY_DONT_FLIP tty flag. This flag was introduced in 2.1.X kernels
to prevent the N_TTY line discipline functions read_chan() and
n_tty_receive_buf() from running at the same time. 2.2.15 introduced
tty->read_lock to protect access to the N_TTY read buffer, which is the
only state requiring protection between these two functions.
The current TTY_DONT_FLIP implementation is broken for SMP, and is not
universally honored by drivers that send data directly to the line
discipline receive_buf function.
Because TTY_DONT_FLIP is not necessary, is broken in implementation, and is
not universally honored, it is removed.
Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tty.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h index cb35ca50a0a6..341cc4552c00 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -259,7 +259,6 @@ struct tty_struct { #define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */ #define TTY_PUSH 6 /* n_tty private */ #define TTY_CLOSING 7 /* ->close() in progress */ -#define TTY_DONT_FLIP 8 /* Defer buffer flip */ #define TTY_LDISC 9 /* Line discipline attached */ #define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */ #define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */ |