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Prevent VSTART flooding when turning on software flow control.

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It turned out we transmitted VSTART after each successful read on a TTY
when software flow control was turned on. This was because of a very
evil bug where we tested the TF_HIWAT_IN flag the other way around.

Reported by:	Christian Weisgerber <naddy mips inka de>
This commit is contained in:
Ed Schouten 2008-08-22 05:15:52 +00:00
parent 2be30c0d91
commit 7dc843ca92
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=181993
1 changed files with 1 additions and 1 deletions
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2
sys/kern/tty.c
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@ -1651,7 +1651,7 @@ void
tty_hiwat_in_unblock(struct tty *tp)
{
if ((tp->t_flags & TF_HIWAT_IN) == 0 &&
if (tp->t_flags & TF_HIWAT_IN &&
tp->t_termios.c_iflag & IXOFF &&
tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) {
/*