aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/char/mxser.c
diff options
context:
space:
mode:
authorPaul Fulghum <paulkf@microgate.com>2006-06-28 07:26:47 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-28 17:59:05 -0400
commit817d6d3bceaf34c99f5343820f9b9e6021f0655c (patch)
tree651104833124262db46c2a372b7adb55289cd8dd /drivers/char/mxser.c
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 'drivers/char/mxser.c')
-rw-r--r--drivers/char/mxser.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index 645d9d713aec..72cfd09091e0 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -996,7 +996,6 @@ static int mxser_open(struct tty_struct *tty, struct file *filp)
996 996
997 info->session = current->signal->session; 997 info->session = current->signal->session;
998 info->pgrp = process_group(current); 998 info->pgrp = process_group(current);
999 clear_bit(TTY_DONT_FLIP, &tty->flags);
1000 999
1001 /* 1000 /*
1002 status = mxser_get_msr(info->base, 0, info->port); 1001 status = mxser_get_msr(info->base, 0, info->port);