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TTY: simserial, properly refcount tty_port->tty 

So that we will not be surprised in the ISR anymore.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2012-03-05 14:52:36 +01:00 committed by Greg Kroah-Hartman
parent 78e74d778a
commit 3a5c242324
1 changed files with 5 additions and 4 deletions
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9
arch/ia64/hp/sim/simserial.c
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@ -107,7 +107,7 @@ static void receive_chars(struct tty_struct *tty)
static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
{
struct serial_state *info = dev_id;
struct tty_struct *tty = info->port.tty;
struct tty_struct *tty = tty_port_tty_get(&info->port);
if (!tty) {
printk(KERN_INFO "simrs_interrupt_single: info|tty=0 info=%p problem\n", info);
@ -118,6 +118,7 @@ static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
* on inbound traffic
*/
receive_chars(tty);
tty_kref_put(tty);
return IRQ_HANDLED;
}
@ -443,9 +444,9 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
*/
shutdown(tty, info);
rs_flush_buffer(tty);
port->tty = NULL;
tty_port_close_end(port, tty);
tty_port_tty_set(port, NULL);
}
/*
@ -467,7 +468,7 @@ static void rs_hangup(struct tty_struct *tty)
port->count = 0;
port->flags &= ~ASYNC_NORMAL_ACTIVE;
port->tty = NULL;
tty_port_tty_set(port, NULL);
wake_up_interruptible(&port->open_wait);
}
@ -556,7 +557,7 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
int retval;
port->count++;
port->tty = tty;
tty_port_tty_set(port, tty);
tty->driver_data = info;
tty->port = port;