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tty: Move tty hung up check from port->lock critical section 

The port->lock does not protect the filp->f_op field; move
the tty_hung_up_p() test outside the port->lock critical section
in tty_port_close_start().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-11-05 12:40:03 -05:00 committed by Greg Kroah-Hartman
parent 19038ad9f0
commit 633caba893
1 changed files with 2 additions and 4 deletions
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6
drivers/tty/tty_port.c
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@ -473,12 +473,10 @@ int tty_port_close_start(struct tty_port *port,
{
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
if (tty_hung_up_p(filp)) {
spin_unlock_irqrestore(&port->lock, flags);
if (tty_hung_up_p(filp))
return 0;
}
spin_lock_irqsave(&port->lock, flags);
if (tty->count == 1 && port->count != 1) {
printk(KERN_WARNING
"tty_port_close_start: tty->count = 1 port count = %d.\n",