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n_tty: Fix EOF push index when termios changes

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Commit 40d5e0905a,
'n_tty: Fix EOF push handling' introduced a subtle state
change error wrt EOF push handling when the termios is
changed from non-canonical to canonical mode.

Reset line_start to the current read_tail index, not 0.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2013-09-17 12:34:14 -04:00 committed by Greg Kroah-Hartman
parent 0b53861230
commit 93a8d4163e
1 changed files with 1 additions and 2 deletions
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3
drivers/tty/n_tty.c
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@ -1758,8 +1758,7 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
canon_change = (old->c_lflag ^ tty->termios.c_lflag) & ICANON;
if (canon_change) {
bitmap_zero(ldata->read_flags, N_TTY_BUF_SIZE);
ldata->line_start = 0;
ldata->canon_head = ldata->read_tail;
ldata->line_start = ldata->canon_head = ldata->read_tail;
ldata->erasing = 0;
ldata->lnext = 0;
}