Make sure to wake up any process sleeping on the modem-status-change
queue at port remove.
Currently a process waiting on modem status changes will not be woken on
device disconnect.
Note that we need to use the disconnected flag to detect disconnect as
the port private data may have been freed when woken up.
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
---
drivers/usb/serial/ark3116.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/serial/ark3116.c b/drivers/usb/serial/ark3116.c
index cbd904b..dd78fa3 100644
--- a/drivers/usb/serial/ark3116.c
+++ b/drivers/usb/serial/ark3116.c
@@ -201,6 +201,8 @@ static int ark3116_port_remove(struct usb_serial_port *port)
{
struct ark3116_private *priv = usb_get_serial_port_data(port);
+ wake_up_interruptible(&priv->delta_msr_wait);
+
/* device is closed, so URBs and DMA should be down */
mutex_destroy(&priv->hw_lock);
kfree(priv);
@@ -460,11 +462,10 @@ static int ark3116_ioctl(struct tty_struct *tty,
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
- if ((prev.rng == priv->icount.rng) &&
- (prev.dsr == priv->icount.dsr) &&
- (prev.dcd == priv->icount.dcd) &&
- (prev.cts == priv->icount.cts))
+
+ if (port->serial->disconnected)
return -EIO;
+
if ((arg & TIOCM_RNG &&
(prev.rng != priv->icount.rng)) ||
(arg & TIOCM_DSR &&
--
1.8.1.1
--
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