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From: Greg KH on 30 Mar 2010 20:30
2.6.31-stable review patch. If anyone has any objections, please let us know.

------------------

From: Alan Cox <alan(a)linux.intel.com>

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(a)linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
drivers/char/nozomi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/char/nozomi.c
+++ b/drivers/char/nozomi.c
@@ -1628,10 +1628,10 @@ static void ntty_close(struct tty_struct

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);


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