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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 <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2009-11-05 13:27:57 +00:00 committed by Greg Kroah-Hartman
parent edfacdd6f8
commit e707c35cbb
1 changed files with 8 additions and 5 deletions
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13
drivers/char/tty_port.c
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@ -339,6 +339,14 @@ int tty_port_close_start(struct tty_port *port,
timeout = 2 * HZ; timeout = 2 * HZ;
schedule_timeout_interruptible(timeout); 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 /* Don't call port->drop for the last reference. Callers will want
to drop the last active reference in ->shutdown() or the tty to drop the last active reference in ->shutdown() or the tty
shutdown path */ shutdown path */
@ -350,11 +358,6 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
{ {
unsigned long flags; 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); spin_lock_irqsave(&port->lock, flags);
tty->closing = 0; tty->closing = 0;