3.5.7.9 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Johan Hovold <[email protected]> commit 43a66b4c417ad15f6d2f632ce67ad195bdf999e8 upstream. Use the port wait queue and make sure to check the serial disconnected flag before accessing private port data after waking up. This is is needed as the private port data (including the wait queue itself) can be gone when waking up after a disconnect. Signed-off-by: Johan Hovold <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> [ luis: backported to 3.5; adjust context ] Signed-off-by: Luis Henriques <[email protected]> --- drivers/usb/serial/ssu100.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c index c4409b1..3ad10b5 100644 --- a/drivers/usb/serial/ssu100.c +++ b/drivers/usb/serial/ssu100.c @@ -65,7 +65,6 @@ struct ssu100_port_private { spinlock_t status_lock; u8 shadowLSR; u8 shadowMSR; - wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */ struct async_icount icount; }; @@ -366,8 +365,9 @@ static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) spin_unlock_irqrestore(&priv->status_lock, flags); while (1) { - wait_event_interruptible(priv->delta_msr_wait, - ((priv->icount.rng != prev.rng) || + wait_event_interruptible(port->delta_msr_wait, + (port->serial->disconnected || + (priv->icount.rng != prev.rng) || (priv->icount.dsr != prev.dsr) || (priv->icount.dcd != prev.dcd) || (priv->icount.cts != prev.cts))); @@ -375,6 +375,9 @@ static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) if (signal_pending(current)) return -ERESTARTSYS; + if (port->serial->disconnected) + return -EIO; + spin_lock_irqsave(&priv->status_lock, flags); cur = priv->icount; spin_unlock_irqrestore(&priv->status_lock, flags); @@ -455,7 +458,6 @@ static int ssu100_attach(struct usb_serial *serial) } spin_lock_init(&priv->status_lock); - init_waitqueue_head(&priv->delta_msr_wait); usb_set_serial_port_data(port, priv); return ssu100_initdevice(serial->dev); @@ -536,7 +538,7 @@ static void ssu100_update_msr(struct usb_serial_port *port, u8 msr) priv->icount.dcd++; if (msr & UART_MSR_TERI) priv->icount.rng++; - wake_up_interruptible(&priv->delta_msr_wait); + wake_up_interruptible(&port->delta_msr_wait); } } -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
