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nozomi: quick fix for the close/close bug 

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>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2010-01-04 16:26:50 +00:00 committed by Greg Kroah-Hartman
parent 3f00171125
commit eeec32a731
1 changed files with 1 additions and 1 deletions
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2
drivers/char/nozomi.c
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@ -1651,10 +1651,10 @@ static void ntty_close(struct tty_struct *tty, struct file *file)
dc->open_ttys--; dc->open_ttys--;
port->count--; port->count--;
tty_port_tty_set(port, NULL);
if (port->count == 0) { if (port->count == 0) {
DBG1("close: %d", nport->token_dl); DBG1("close: %d", nport->token_dl);
tty_port_tty_set(port, NULL);
spin_lock_irqsave(&dc->spin_mutex, flags); spin_lock_irqsave(&dc->spin_mutex, flags);
dc->last_ier &= ~(nport->token_dl); dc->last_ier &= ~(nport->token_dl);
writew(dc->last_ier, dc->reg_ier); writew(dc->last_ier, dc->reg_ier);