nozomi: quick fix for the close/close bug

commit eeec32a731631a9bad9abb21c626b9f2840bee0d upstream.

Nozomi goes wrong if you get the sequence

	open
	open
	close

	[stuff]
	close

which turns out to occur on some ppp type setups.

This is a quick patch up for the problem. It's not really fixing Nozomi
which completely fails to implement tty open/close semantics and all the
other needed stuff. Doing it right is a rather more invasive patch set and
not one that will backport.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/nozomi.c b/drivers/char/nozomi.c
index ec58d8c387ff2303f67db428622f68b7eff76057..2171e9dac1ab7eb8fd64f1db9780b9f25f37c7f8 100644 (file)
--- a/drivers/char/nozomi.c
+++ b/drivers/char/nozomi.c
@@ -1628,10 +1628,10 @@ static void ntty_close(struct tty_struct *tty, struct file *file)
 
        dc->open_ttys--;
        port->count--;
-       tty_port_tty_set(port, NULL);
 
        if (port->count == 0) {
                DBG1("close: %d", nport->token_dl);
+               tty_port_tty_set(port, NULL);
                spin_lock_irqsave(&dc->spin_mutex, flags);
                dc->last_ier &= ~(nport->token_dl);
                writew(dc->last_ier, dc->reg_ier);