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authorPaul Fulghum <paulkf@microgate.com>2006-06-28 04:26:47 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-28 14:59:05 -0700
commit817d6d3bceaf34c99f5343820f9b9e6021f0655c (patch)
tree651104833124262db46c2a372b7adb55289cd8dd /include/linux/tty.h
parente0ac4761fa52acda90f9f53819c81474b511e3af (diff)
[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/linux/tty.h')
-rw-r--r--include/linux/tty.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index cb35ca50a0a..341cc4552c0 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 */