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TTY: Fix tty miss restart after we turn off flow-control
I meet emacs hang in start if I do the operation below: 1: echo 3 > /proc/sys/vm/drop_caches 2: emacs BigFile 3: Press CTRL-S follow 2 immediately Then emacs hang on, CTRL-Q can't resume, the terminal hang on, you can do nothing with this terminal except close it. The reason is before emacs takeover control the tty, we use CTRL-S to XOFF it. Then when emacs takeover the control, it may don't use the flow-control, so emacs hang. This patch fix it. This patch will fix a kind of strange tty relation hang problem, I believe I meet it with vim in ssh, and also see below bug report: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=465823 Signed-off-by: Wang YanQing <udknight@gmail.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1573,6 +1573,14 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
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ldata->real_raw = 0;
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}
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n_tty_set_room(tty);
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/*
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* Fix tty hang when I_IXON(tty) is cleared, but the tty
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* been stopped by STOP_CHAR(tty) before it.
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*/
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if (!I_IXON(tty) && old && (old->c_iflag & IXON) && !tty->flow_stopped) {
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start_tty(tty);
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}
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/* The termios change make the tty ready for I/O */
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wake_up_interruptible(&tty->write_wait);
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wake_up_interruptible(&tty->read_wait);
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