From e707c35cbbe83a016cf0122a29e3a47b5a9e35c4 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Thu, 5 Nov 2009 13:27:57 +0000 Subject: [PATCH] tty_port: Move hupcl handling Move the HUCPL handling from the end of close_port_start to the beginning of close_port_end. What this actually does is change the ordering from port shutdown port->dtr_rts to port->dtr_rts port shutdown Some hardware drops the physical connection on shutdown so we must perform the port operations before the shutdown. Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/char/tty_port.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c index 41b314cfda47..dd471d63fae2 100644 --- a/drivers/char/tty_port.c +++ b/drivers/char/tty_port.c @@ -339,6 +339,14 @@ int tty_port_close_start(struct tty_port *port, timeout = 2 * HZ; schedule_timeout_interruptible(timeout); } + /* Flush the ldisc buffering */ + tty_ldisc_flush(tty); + + /* Drop DTR/RTS if HUPCL is set. This causes any attached modem to + hang up the line */ + if (tty->termios->c_cflag & HUPCL) + tty_port_lower_dtr_rts(port); + /* Don't call port->drop for the last reference. Callers will want to drop the last active reference in ->shutdown() or the tty shutdown path */ @@ -350,11 +358,6 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty) { unsigned long flags; - tty_ldisc_flush(tty); - - if (tty->termios->c_cflag & HUPCL) - tty_port_lower_dtr_rts(port); - spin_lock_irqsave(&port->lock, flags); tty->closing = 0;